TCN75A (Microchip)
2-Wire Serial Temperature Sensor

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TCN75A
2-Wire Serial Temperature Sensor
Features:
• Temperature-to-Digital Converter
• Accuracy:
- ±1 (typical) from -40°C to +125°C
- ±2°C (maximum) from -40°C to +125°C
• User-selectable Resolution: 0.5°C to 0.0625°C
• Operating Voltage Range: 2.7V to 5.5V
• 2-wire Interface: I2C™ Compatible
• Operating Current: 200 µA (typical)
• Shutdown Current: 2 µA (maximum)
• Power-saving One-shot Temperature
Measurement
• Available Packages: MSOP-8, SOIC-8
Typical Applications:
• Personal Computers and Servers
• Hard Disk Drives and Other PC Peripherals
• Entertainment Systems
• Office Equipment
• Data Communication Equipment
• General Purpose Temperature Monitoring
Typical Application
VDD
PIC®
Microcontroller R
SDA
I/O Ports SCL
ALERT
RPULL-UP
VDD
1 SDA VDD 8
2 SCL A0 7
3 ALERT A1 6
4 GND A2 5
TCN75A
Description:
Microchip Technology Inc.’s TCN75A digital tempera-
ture sensor converts temperatures between -40°C and
+125°C to a digital word, with ±1°C (typical) accuracy.
The TCN75A product comes with user-programmable
registers that provide flexibility for temperature-sensing
applications. The register settings allow
user-selectable, 0.5°C to 0.0625°C temperature
measurement resolution, configuration of the
power-saving Shutdown and One-shot (single
conversion on command while in Shutdown) modes
and the specification of both temperature alert output
and hysteresis limits. When the temperature changes
beyond the specified limits, the TCN75A outputs an
alert signal. The user has the option of setting the alert
output signal polarity as an active-low or active-high
comparator output for thermostat operation, or as
temperature event interrupt output for
microprocessor-based systems.
This sensor has an industry standard 2-wire, I2C™
compatible serial interface, allowing up to eight devices
to be controlled in a single serial bus. These features
make the TCN75A ideal for low-cost, sophisticated
multi-zone temperature-monitoring applications.
Package Types
8-Pin SOIC, MSOP
SDA 1
SCL 2
ALERT 3
GND 4
8 VDD
7 A0
6 A1
5 A2
2010 Microchip Technology Inc.
DS21935D-page 1


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2-Wire Serial Temperature Sensor

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TCN75A
NOTES:
DS21935D-page 2
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2-Wire Serial Temperature Sensor

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TCN75A
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD....................................................................... 6.0V
Voltage at all Input/Output pins .....GND – 0.3V to 5.5V
Storage temperature .......................... -65°C to +150°C
Ambient temp. with power applied ..... -55°C to +125°C
Junction Temperature (TJ) ................................. 150°C
ESD protection on all pins (HBM:MM) .......(4 kV:400V)
Latch-up current at each pin ......................... ±200 mA
†Notice: Stresses above those listed under “Maximum
ratings” may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, and
TA = -40°C to +125°C.
Parameters
Sym
Min Typ Max Unit
Conditions
Power Supply
Operating Voltage Range
Operating Current
Shutdown Current
Power-on Reset (POR) Threshold
Line Regulation
Temperature Sensor Accuracy
TA = -40°C to +125°C
Internal  ADC
Conversion Time:
0.5°C Resolution
0.25°C Resolution
0.125°C Resolution
0.0625°C Resolution
Alert Output (Open-drain)
High-level Current
Low-level Voltage
Thermal Response
Response Time
VDD
IDD
ISHDN
VPOR
°C/VDD
TACY
tCONV
tCONV
tCONV
tCONV
IOH
VOL
tRES
2.7
-2
— 5.5 V
200 500
µA Continuous operation
0.1 2 µA Shutdown mode
1.7 —
V VDD falling edge
0.2 — °C/V VDD = 2.7V to 5.5V
±1 +2 °C VDD = 3.3V
30 — ms 33 samples/sec (typical)
60 — ms 17 samples/sec (typical)
120 — ms 8 samples/sec (typical)
240 — ms 4 samples/sec (typical)
— 1 µA VOH = 5V
— 0.4 V IOL= 3 mA
1.4 —
s Time to 63% (89°C)
27°C (air) to 125°C (oil
bath)
2010 Microchip Technology Inc.
DS21935D-page 3


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2-Wire Serial Temperature Sensor

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TCN75A
DIGITAL INPUT/OUTPUT PIN CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground and
TA = -40°C to +125°C.
Parameters
Sym
Min Typ Max Units
Conditions
Serial Input/Output (SCL, SDA, A0, A1, A2)
Input
High-level Voltage
Low-level Voltage
Input Current
Output (SDA)
Low-level Voltage
High-level Current
Low-level Current
Capacitance
SDA and SCL Inputs
Hysteresis
VIH 0.7 VDD
V
VIL — — 0.3 VDD V
IIN -1 — +1 µA
VOL
— 0.4
V IOL= 3 mA
IOH — — 1 µA VOH = 5V
IOL 6 — — mA VOL = 0.6V
CIN — 10 — pF
VHYST 0.05 VDD
V
Graphical Symbol Description
Voltage
INPUT
VDD
VIH
Current
time
VIL
IIN
time
Voltage
VDD
VOL
Current
IOL
IOH
OUTPUT
time
time
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = +2.7V to +5.5V and GND = Ground.
Parameters
Sym Min Typ Max Units
Conditions
Temperature Ranges
Specified Temperature Range
Operating Temperature Range
Storage Temperature Range
TA -40 — +125 °C Note 1
TA -40 — +125 °C
TA -65 — +150 °C
Thermal Package Resistances
Thermal Resistance, 8L-SOIC
JA — 163 — °C/W
Thermal Resistance, 8L-MSOP
JA — 206 — °C/W
Note 1: Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150°C).
DS21935D-page 4
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2-Wire Serial Temperature Sensor

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TCN75A
SERIAL INTERFACE TIMING SPECIFICATIONS (Note 1)
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, TA = -40°C to +125°C,
CL = 80 pF and all limits measured to 50% point.
Parameters
Sym
Min Typ Max Units
Conditions
2-Wire I2C™ Compatible Interface
Serial Port Frequency
fSC 0 — 400
Clock Period
tSC
2.5 —
Low Clock
tLOW
1.3 —
High Clock
tHIGH
0.6 —
Rise Time
tR 20 — 300
Fall Time
tF 20 — 300
Data Setup Before SCL High
tSU-DATA
0.1
Data Hold After SCL Low
tH-DATA
0
Start Condition Setup Time
tSU-START 0.6
Start Condition Hold Time
tH-START
0.6
Stop Condition Setup Time
tSU-STOP
0.6
Bus Idle
tB-FREE
1.3
Note 1: Specification limits are characterized but not product tested.
kHz
µs
µs
µs
ns
ns
µs
µs
µs
µs
µs
µs
10% to 90% of VDD (SCL, SDA)
90% to 10% of VDD (SCL, SDA)
Timing Diagram
Start Condition
Data Transmission
Stop Condition
2010 Microchip Technology Inc.
DS21935D-page 5


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2-Wire Serial Temperature Sensor

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TCN75A
NOTES:
DS21935D-page 6
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2-Wire Serial Temperature Sensor

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TCN75A
2.0 TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Note: Unless otherwise noted: VDD = 2.7V to 5.5V.
3.0
2.0
1.0 Specification
Limits
0.0
VDD = 3.3V
0.0625°C Resolution
160 Devices
-1.0
-2.0
-3.0
-55 -35 -15 5 25 45 65 85 105 125
TA (°C)
FIGURE 2-1:
Average Temperature
Accuracy vs. Ambient Temperature, VDD = 3.3V.
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
TA = +25°C
VDD = 3.3V
5 lots
32 Samples/lot
160 Devices
Temperature Accuracy (°C)
FIGURE 2-4:
Temperature Accuracy
Histogram, TA = +25°C.
3.0
2.0 VDD = 2.7V
VDD = 3.3V
1.0 VDD = 5.0V
VDD = 5.5V
0.0
0.0625°C Resolution
160 Devices
-1.0
-2.0
-3.0
-55 -35 -15 5 25 45 65 85 105 125
TA (°C)
FIGURE 2-2:
Average Temperature
Accuracy vs. Ambient Temperature.
400
350
300
250
VDD = 2.7V
VDD = 3.3V
VDD = 5.0V
VDD = 5.5V
200
150
100
50
-55 -35 -15
5
25 45 65 85 105 125
TA (°C)
FIGURE 2-5:
Temperature.
Supply Current vs. Ambient
3.0
Resolution
2.0
1.0
0.125°C
0.0625°C
0.0
VDD = 3.3V
160 Devices
-1.0
-2.0
0.5°C
0.25°C
-3.0
-55 -35 -15 5 25 45 65 85 105 125
TA (°C)
FIGURE 2-3:
Average Temperature
Accuracy vs. Ambient Temperature, VDD = 3.3V.
1
0.8
0.6
0.4
0.2
0
-55 -35 -15 5 25 45 65 85 105 125
TA (°C )
FIGURE 2-6:
Shutdown Current vs.
Ambient Temperature.
2010 Microchip Technology Inc.
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2-Wire Serial Temperature Sensor

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TCN75A
Note: Unless otherwise noted: VDD = 2.7V to 5.5V.
48
VOL = 0.6V
42
36
30
VDD = 5.5V
VDD = 3.3V
VDD = 2.7V
24
18
12
6
-55 -35 -15 5 25 45 65 85 105 125
TA (°C)
FIGURE 2-7:
ALERT and SDA IOL vs.
Ambient Temperature.
0.4
IOL = 3 mA
0.3
0.2
VDD = 5.5V
VDD = 3.3V
VDD = 2.7V
0.1
0
-55 -35 -15 5 25 45 65 85 105 125
TA (°C)
FIGURE 2-8:
ALERT and SDA Output
VOL vs. Ambient Temperature.
145
Average of 10 samples per package
125
105
85
65 SOIC
45 MSOP
25
27°C (Air) to 125°C (Oil bath)
5
-2 0 2 4 6 8 10 12 14 16 18 20
Time (s)
FIGURE 2-9:
vs. Time.
TCN75A Thermal Response
DS21935D-page 8
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2-Wire Serial Temperature Sensor

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TCN75A
3.0 PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1: PIN FUNCTION TABLE
MSOP, SOIC
1
2
3
4
5
6
7
8
Symbol
SDA
SCL
ALERT
GND
A2
A1
A0
VDD
Bidirectional Serial Data
Serial Clock Input
Temperature Alert Output
Ground
Address Select Pin (bit 2)
Address Select Pin (bit 1)
Address Select Pin (bit 0)
Power Supply Input
Function
3.1 Serial Data Pin (SDA)
SDA is a bidirectional input/output pin, used to serially
transmit data to and from the host controller. This pin
requires a pull-up resistor to output data.
3.2 Serial Clock Pin (SCL)
SCL is a clock input pin. All communication and timing
is relative to the signal on this pin. The clock is
generated by the host controller on the bus.
3.3 Power Supply Input (VDD)
VDD is the power pin. The operating voltage, as
specified in the DC electrical specification table, is
applied on this pin.
3.4 Ground (GND)
GND is the system ground pin.
3.5 ALERT Output
The TCN75A’s ALERT pin is an open-drain output. The
device outputs an alert signal when the ambient
temperature goes beyond the user-programmed
temperature limit.
3.6 Address Pins (A2, A1, A0)
A2, A1 and A0 are device or slave address input pins.
The address pins are the Least Significant bits (LSb) of
the device address bits. The Most Significant bits
(MSb) (A6, A5, A4, A3) are factory-set to <1001>. This
is illustrated in Table 3-2.
TABLE 3-2: SLAVE ADDRESS
Device
A6 A5 A4 A3 A2 A1 A0
TCN75A
1001XXX
Note: User-selectable address is shown by X.
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2-Wire Serial Temperature Sensor

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TCN75A
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DS21935D-page 10
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2-Wire Serial Temperature Sensor

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4.0 SERIAL COMMUNICATION
4.1 2-Wire SMBus/Standard Mode
I2C™ Protocol-Compatible
Interface
The TCN75A serial clock input (SCL) and the
bidirectional serial data line (SDA) form a 2-wire
bidirectional SMBus/Standard mode I2C compatible
communication port (refer to the Digital Input/output
Pin Characteristics Table and Serial Interface
Timing Specifications (Note 1) Table).
The following bus protocol has been defined:
TABLE 4-1: TCN75A SERIAL BUS
PROTOCOL DESCRIPTIONS
Term
Description
Master
Slave
Transmitter
Receiver
Start
Stop
Read/Write
ACK
NAK
Busy
Not Busy
Data Valid
The device that controls the serial bus,
typically a microcontroller.
The device addressed by the master,
such as the TCN75A.
Device sending data to the bus.
Device receiving data from the bus.
A unique signal from master to initiate
serial interface with a slave.
A unique signal from the master to
terminate serial interface from a slave.
A read or write to the TCN75A
registers.
A receiver Acknowledges (ACK) the
reception of each byte by polling the
bus.
A receiver Not-Acknowledges (NAK) or
releases the bus to show End-of-Data
(EOD).
Communication is not possible
because the bus is in use.
The bus is in the Idle state, both SDA
and SCL remain high.
SDA must remain stable before SCL
becomes high in order for a data bit to
be considered valid. During normal
data transfers, SDA only changes state
while SCL is low.
TCN75A
4.1.1 DATA TRANSFER
Data transfers are initiated by a Start condition (Start),
followed by a 7-bit device address and a read/write bit.
An Acknowledge (ACK) from the slave confirms the
reception of each byte. Each access must be
terminated by a Stop condition (Stop).
Repeated communication is initiated after tB-FREE.
This device does not support sequential register read/
write. Each register needs to be addressed using the
Register Pointer.
This device supports the Receive Protocol. The
register can be specified using the pointer for the initial
read. Each repeated read or receive begins with a Start
condition and address byte. The TCN75A retains the
previously selected register. Therefore, it outputs data
from the previously specified register (repeated pointer
specification is not necessary).
4.1.2 MASTER/SLAVE
The bus is controlled by a master device (typically a
microcontroller) that controls the bus access and
generates the Start and Stop conditions. The TCN75A
is a slave device and does not control other devices in
the bus. Both master and slave devices can operate as
either transmitter or receiver. However, the master
device determines which mode is activated.
4.1.3 START/STOP CONDITION
A high-to-low transition of the SDA line (while SCL is
high) is the Start condition. All data transfers must be
preceded by a Start condition from the master. If a Start
condition is generated during data transfer, the
TCN75A resets and accepts the new Start condition.
A low-to-high transition of the SDA line (while SCL is
high) signifies a Stop condition. If a Stop condition is
introduced during data transmission, the TCN75A
releases the bus. All data transfers are ended by a Stop
condition from the master.
4.1.4 ADDRESS BYTE
Following the Start condition, the host must transmit an
8-bit address byte to the TCN75A. The address for the
TCN75A Temperature Sensor is ‘1001,A2,A1,A0’ in
binary, where the A2, A1 and A0 bits are set externally
by connecting the corresponding pins to VDD 1’ or
GND ‘0’. The 7-bit address transmitted in the serial bit
stream must match the selected address for the
TCN75A to respond with an ACK. Bit 8 in the address
byte is a read/write bit. Setting this bit to ‘1’ commands
a read operation, while ‘0’ commands a write operation
(see Figure 4-1).
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TCN75A
Address Byte
SCL
12345678 9
SDA
Start
1 0 0 1 A2 A1 A0
A
C
K
Address
Code
Slave
Address
R/W
TCN75A Response
FIGURE 4-1:
Device Addressing.
4.1.5 DATA VALID
After the Start condition, each bit of data in
transmission needs to be settled for a time specified by
tSU-DATA before SCL toggles from low-to-high (see
“Serial Interface Timing Specifications (Note 1)”.
4.1.6 ACKNOWLEDGE (ACK)
Each receiving device, when addressed, is obliged to
generate an ACK bit after the reception of each byte.
The master device must generate an extra clock pulse
for ACK to be recognized.
The acknowledging device pulls down the SDA line for
tSU-DATA before the low-to-high transition of SCL from
the master. SDA also needs to remain pulled down for
tH-DATA after a high-to-low transition of SCL.
During read, the master must signal an End-of-Data
(EOD) to the slave by not generating an ACK bit (NAK)
once the last bit has been clocked out of the slave. In
this case, the slave will leave the data line released to
enable the master to generate the Stop condition.
DS21935D-page 12
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5.0 FUNCTIONAL DESCRIPTION
The TCN75A temperature sensor consists of a band-
gap type temperature sensor, a  Analog-to-Digital
Converter (ADC), user-programmable registers and a
2-wire I2C protocol-compatible serial interface.
Resolution
One-Shot
Shutdown
Fault Queue
Alert Polarity
Alert Comp/Int
Configuration
Register
Temperature
Register
THYST
Register
TSET
Register
0.5°C
0.25°C
0.125°C
0.0625°C
 ADC
Band-Gap
Temperature
Sensor
Register
Pointer
I2C™
Interface
FIGURE 5-1:
Functional Block Diagram.
TCN75A
5.1 Temperature Sensor
The TCN75A uses the difference in the base-emitter
voltage of a transistor while its collector current is
changed from IC1 to IC2. With this method, the VBE
depends only on the ratio of the two currents and the
ambient temperature, as shown in Equation 5-1.
EQUATION 5-1:
Where:
VBE
=
k--q--T-
lnIC1 IC2
T = temperature in kelvin
VBE = change in diode base-emitter
voltage
k = Boltzmann’s constant
q = electron charge
IC1 and IC2 = currents with n:1 ratio
5.2  Analog-to-Digital Converter
A Sigma-Delta ADC is used to convert VBE to a digital
word that corresponds to the transistor temperature.
The converter has an adjustable resolution from 0.5°C
(at 30 ms conversion time) to 0.0625°C (at 240 ms
conversion time). Thus, it allows the user to make
trade-offs between resolution and conversion time.
Refer to Section 5.3.2 “Sensor Configuration
Register (CONFIG)” and Section 5.3.4.7 “ ADC
Resolution” for details.
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TCN75A
5.3 Registers
The TCN75A has four registers that are
user-accessible. These registers are specified as the
Ambient Temperature (TA) register, the Temperature
Limit-set (TSET) register, the Temperature Hysteresis
(THYST) register and device Configuration (CONFIG)
register.
The Ambient Temperature register is a read-only
register and is used to access the ambient temperature
data. The data from the ADC is loaded in parallel in the
register. The Temperature Limit-set and Temperature
Hysteresis registers are read/write registers that
provide user-programmable temperature limits. If the
ambient temperature drifts beyond the programmed
limits, the TCN75A outputs an alert signal using the
ALERT pin (refer to Section 5.3.4.3 “ALERT Output
Configuration”). The device Configuration register
provides access for the user to configure the TCN75A’s
various features. These registers are described in
further detail in the following sections.
The registers are accessed by sending Register Point-
ers to the TCN75A using the serial interface. This is an
8-bit pointer. However, the two Least Significant bits
(LSbs) are used as pointers and all other bits need to
be cleared <0>. This device has additional registers
that are reserved for test and calibration. If these
registers are accessed, the device may not perform
according to the specification. The pointer description
is shown below.
Resolution
One-Shot
Shutdown
Fault Queue
Alert Polarity
Alert Comp/Int
Configuration
Register
Temperature
Register
THYST
Register
TSET
Register
ALERT Output
Control Logic
ALERT
Output
FIGURE 5-2:
Register Block Diagram.
REGISTER 5-1:
U-0
0
bit 7
REGISTER POINTER
U-0 U-0
00
U-0
0
U-0
0
U-0
R/W-0
R/W-0
0 P1 P0
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7-2
bit 1-0
.
Unimplemented: Read as ‘0
Pointer bits
00 = Temperature register (TA)
01 = Configuration register (CONFIG)
10 = Temperature Hysteresis register (THYST)
11 = Temperature Limit-set register (TSET)
DS21935D-page 14
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TCN75A
TABLE 5-1: BIT ASSIGNMENT SUMMARY FOR ALL REGISTERS
Register
Pointer
P1 P0
MSB/
LSB
7
6
Bit Assignment
5 43
Ambient Temperature Register (TA)
0 0 MSB
Sign
26°C
LSB
2-1°C
2-2°C
25°C
2-3°C
Sensor Configuration Register (CONFIG)
0 1 LSB One-Shot
Resolution
24°C
2-4°C
23°C
0
Fault Queue
Temperature Hysteresis Register (THYST)
1 0 MSB
Sign
26°C
LSB
2-1°C
0
Temperature Limit-Set Register (TSET)
1 1 MSB
Sign
26°C
LSB
2-1°C
0
25°C
0
25°C
0
24°C
0
24°C
0
23°C
0
23°C
0
2 10
22°C
0
21°C
0
20°C
0
ALERT COMP/INT Shutdown
Polarity
22°C
0
21°C
0
20°C
0
22°C
0
21°C
0
20°C
0
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TCN75A
5.3.1 AMBIENT TEMPERATURE
REGISTER (TA)
The TCN75A has a 16-bit read-only Ambient
Temperature register that contains 9-bit to 12-bit
temperature data. (0.5°C to 0.0625°C resolutions,
respectively). This data is formatted in two’s
complement. The bit assignments, as well as the
corresponding resolution, is shown in the register
assignment below.
The refresh rate of this register depends on the
selected ADC resolution. It takes 30 ms (typical) for
9-bit data and 240 ms (typical) for 12-bit data. Since
this register is double-buffered, the user can read the
register while the TCN75A performs Analog-to-Digital
conversion in the background. The decimal code to
ambient temperature conversion is shown in
Equation 5-2:
EQUATION 5-2:
Where:
TA = Code 24
TA = Ambient Temperature (°C)
Code = TCN75A output in decimal
REGISTER 5-2:
Upper Half:
R-0
Sign
bit 15
AMBIENT TEMPERATURE REGISTER (TA) — ADDRESS <0000 0000>b
R-0
26 °C
R-0
25 °C
R-0
24 °C
R-0
23 °C
R-0
22 °C
R-0
21 °C
R-0
20 °C
bit 8
Lower Half:
R-0 R-0 R-0 R-0 R-0 R-0 R-0 R-0
2-1 °C/bit
2-2 °C
2-3 °C
2-4 °C
0
0
00
bit 7 bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
Note 1: When the 0.5°C, 0.25°C or 0.125°C resolutions are selected, bit 6, bit 7 or bit 8 will remain clear <0>,
respectively.
DS21935D-page 16
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2-Wire Serial Temperature Sensor

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TCN75A
SCL
SDA
1 2 34 5678
12345678
S1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
0
0
A
C
K
Address Byte
TCN75A
TA Pointer
TCN75A
Note:
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write.
(see Section 4.1.1)
SCL
SDA
1 2 34 5678
12345678
12345678
S
1
0
0
1
A
2
A
1
A
0
A
R
C
K
0
0
0
1
1
0
01
A
C
K
0
1
0
0
0
0
0
N
0
A
K
P
Address Byte
TCN75A
MSB Data
Master
LSB Data
Master
FIGURE 5-3:
Timing Diagram for Reading +25.25°C Temperature from the TA Register (See
Section 4.0 “Serial Communication”).
2010 Microchip Technology Inc.
DS21935D-page 17


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TCN75A
5.3.2
SENSOR CONFIGURATION
REGISTER (CONFIG)
The TCN75A has an 8-bit read/write Configuration
register that allows the user to select the different
features. These features include shutdown, ALERT
output select as comparator or interrupt output, ALERT
output polarity, fault queue cycle, temperature
measurement resolution and One-shot mode (single
conversion while in shutdown). These functions are
described in detail in the following sections.
REGISTER 5-3: CONFIGURATION REGISTER (CONFIG) — ADDRESS <0000 0001>b
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
One-Shot
Resolution
Fault Queue
ALERT
Polarity
COMP/INT
bit 7
R/W-0
Shutdown
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
bit 6-5
bit 4-3
bit 2
bit 1
bit 0
ONE-SHOT bit
1 = Enabled
0 = Disabled (Power-up default)
 ADC RESOLUTION bits
00 = 9 bit or 0.5°C (Power-up default)
01 = 10 bit or 0.25°C
10 = 11 bit or 0.125°C
11 = 12 bit or 0.0625°C
FAULT QUEUE bits
00 = 1 (Power-up default)
01 = 2
10 = 4
11 = 6
ALERT POLARITY bit
1 = Active-high
0 = Active-low (Power-up default)
COMP/INT bit
1 = Interrupt mode
0 = Comparator mode (Power-up default)
SHUTDOWN bit
1 = Enable
0 = Disable (Power-up default)
DS21935D-page 18
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2-Wire Serial Temperature Sensor

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TCN75A
• Writing to the CONFIG Register to change the resolution to 0.0625°C <0110 0000>b.
SCL
1 2 34 56 78
12345678
SDA
S
1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
0
1
A
C
K
Address Byte
CONFIG Pointer
TCN75A
TCN75A
12345678
1
A
0
1
1
0
0
0
0
0
C
K
P
MSB Data
TCN75A
• Reading the CONFIG Register.
SCL
1 2 34 5678
1 23 4 567 8
SDA
S1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
0
1
A
C
K
Address Byte
CONFIG Pointer
TCN75A
TCN75A
Note:
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write
(see Section 4.1.1).
SCL
1 2 34 5678
12345678
SDA
S1
0
0
1
A
2
A
1
A
0
A
R
C
K
0
1
1
0
0
0
0
0
N
AP
K
Address Byte
TCN75A
Data
FIGURE 5-4:
Timing Diagram for Writing and Reading from the Configuration Register (See
Section 4.0 “Serial Communication”).
2010 Microchip Technology Inc.
DS21935D-page 19


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TCN75A
5.3.3 TEMPERATURE HYSTERESIS
REGISTER (THYST)
The TCN75A has a 16-bit read/write Temperature
Hysteresis register that contains a 9-bit data in two’s
compliment format. This register is used to set a
hysteresis for the TSET limit. Therefore, the data
represents a minimum temperature limit. If the ambient
temperature drifts below the specified limit, the
TCN75A asserts an alert output (refer to
Section 5.3.4.3 “ALERT Output Configuration”).
This register uses the nine Most Significant bits (MSbs)
and all other bits are “don’t cares”.
The power-up default value of THYST register is 75°C,
or <0100 1011 0>b in binary.
REGISTER 5-4:
Upper Half:
R/W-0
Sign
bit 15
TEMPERATURE HYSTERESIS REGISTER (THYST) — ADDRESS <0000 0010>b
R/W-1
26 °C
R/W-0
25 °C
R/W-0
24 °C
R/W-1
23 °C
R/W-0
22 °C
R/W-1
21 °C
R/W-1
20 °C
bit 8
Lower Half:
R/W-0
R-0
R-0
R-0 R-0
R-0
R-0 R-0
2-1 °C
0
0 00
0
00
bit 7 bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
DS21935D-page 20
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2-Wire Serial Temperature Sensor

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TCN75A
• Writing to the THYST Register to set the temperature hysteresis to 95°C <0101 1111 0000 0000>b.
1 2 34 56 78
12345678
SCL
SDA
S
1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
1
0
A
C
K
Address Byte
TCN75A
THYST Pointer
TCN75A
12345678
12345678
0
1
0
11
1
11
A
C
K
0
0
0
00
0
A
0
0
C
K
P
MSB Data
TCN75A
LSB Data
TCN75A
• Reading the THYST Register.
SCL
1 2 34 5678
1 23 4 567 8
SDA
S1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
1
0
A
C
K
Address Byte
TCN75A
THYST Pointer
TCN75A
Note:
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write
(see Section 4.1.1).
SCL
1 2 34 5678
12345678
12345678
SDA
S1
0
0
1
A
2
A
1
A
0
A
R
C
K
0
1
0
1
1
1
1
1
A
C
K
0
0
0
0
0
0
0
N
0
A
K
P
Address Byte
TCN75A
MSB Data
Master
LSB Data
Master
FIGURE 5-5:
Timing Diagram for Writing and Reading from the Temperature Hysteresis Register
(See Section 4.0 “Serial Communication”).
2010 Microchip Technology Inc.
DS21935D-page 21


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TCN75A
5.3.4 TEMPERATURE LIMIT-SET
REGISTER (TSET)
The TCN75A has a 16-bit read/write Temperature
Limit-Set register (TSET) which contains a 9-bit data in
two’s compliment format. This data represents a
maximum temperature limit. If the ambient temperature
exceeds this specified limit, the TCN75A asserts an
alert output. (Refer to Section 5.3.4.3 “ALERT Output
Configuration”).
This register uses the nine Most Significant bits (MSbs)
and all other bits are “don’t cares”.
The power-up default value of the TSET register is
80°C, or <0101 0000 0>b in binary.
REGISTER 5-5: TEMPERATURE LIMIT-SET REGISTER (TSET) — ADDRESS <0000 0011>b
Upper Half:
R/W-0
Sign
R/W-1
26 °C
R/W-0
25 °C
R/W-1
24 °C
R/W-0
23 °C
R/W-0
22 °C
R/W-0
21 °C
R/W-0
20 °C
bit 15
bit 8
Lower Half:
R/W-0
R-0
R-0
R-0 R-0
R-0
R-0 R-0
2-1 °C
0
0 00
0
00
bit 7 bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
DS21935D-page 22
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2-Wire Serial Temperature Sensor

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TCN75A
• Writing to the TSET Register to set the temperature limit to 90°C, <0101 1010 0000 0000>b
SCL
1 2 34 56 78
12345678
SDA
S
1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
1
1
A
C
K
Address Byte
TCN75A
TSET Pointer
TCN75A
12345678
12345678
0
1
0
11
0
10
A
C
K
0
0
0
00
0
A
0
0
C
K
P
MSB Data
TCN75A
LSB Data
TCN75A
• Reading the TSET Register.
SCL
1 2 34 5678
1 23 4 567 8
SDA
S1
0
0
1
A
2
A
1
A
0
W
A
C
K
0
0
0
0
0
0
1
1
A
C
K
Address Byte
TCN75A
TSET Pointer
TCN75A
Note:
It is not necessary to
select the Register
Pointer if it was set
from the previous read/
write.
(see Section 4.1.1)
SCL
1 2 34 5678
12345678
12345678
SDA
S1
0
0
1
A
2
A
1
A
0
A
R
C
K
0
1
0
1
1
0
1
0
A
C
K
0
0
0
0
0
0
0
N
0
A
K
P
Address Byte
TCN75A
MSB Data
Master
LSB Data
Master
FIGURE 5-6:
Timing Diagram for Writing and Reading from the Temperature Limit-set Register
(See Section 4.0 “Serial Communication”).
2010 Microchip Technology Inc.
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TCN75A
5.3.4.1 Shutdown Mode
The Shutdown mode disables all power-consuming
activities (including temperature sampling operations)
while leaving the serial interface active. The device
consumes 2 µA (maximum) in this mode. It remains in
this mode until the Configuration register is updated to
enable continuous conversion or until power is
recycled.
In Shutdown mode, the CONFIG, TA, TSET and THYST
registers can be read or written to; however, the serial
bus activity will increase the shutdown current.
5.3.4.2 One-Shot Mode
The TCN75A can also be used in a One-shot mode that
can be selected using bit 7 of the CONFIG register. The
One-shot mode performs a single temperature
measurement and returns to Shutdown mode. This
mode is especially useful for low-power applications
where temperature is measured upon command from a
controller. For example, a 9-bit TA in One-shot mode
consumes 200 µA (typical) for 30 ms and 0.1 µA
(typical) during shutdown.
To access this feature, the device needs to initially be
in Shutdown mode. This is done by sending a byte to
the CONFIG register with bit 0 set <1> and bit 7 cleared
<0>. Once the device is in Shutdown mode, the
CONFIG register needs to be written to again, with bit
0 and bit 7 set <1>. This begins the single conversion
cycle of tCONV, 30ms for 9-bit data. Once the
conversion is completed, TA is updated and bit 7 of the
CONFIG register becomes cleared <0> by the
TCN75A.
TABLE 5-2: SHUTDOWN AND ONE-SHOT
MODE DESCRIPTION
Operational Mode
One-Shot Shutdown
(Bit 7)
(Bit 0)
Continuous Conversion
Shutdown
Continuous Conversion
(One-shot is ignored)
0
0
1
0
1
0
One-shot (Note 1)
11
Note 1: The shutdown command <01> needs to
be programmed before sending a
one-shot command <11>.
5.3.4.3 ALERT Output Configuration
The ALERT output can be configured as either a
comparator output or as Interrupt Output mode using
bit 1 of the CONFIG register. The polarity can also be
specified as an active-high or active-low using bit 2 of
the CONFIG register. The following sections describe
each output mode, while Figure 5-7 gives a graphical
description.
5.3.4.4 Comparator Mode
In Comparator mode, the ALERT output is asserted
when TA is greater than TSET. The pin remains active
until TA is lower than THYST. The Comparator mode is
useful for thermostat-type applications, such as turning
on a cooling fan or triggering a system shutdown when
the temperature exceeds a safe operating range.
In Comparator mode, if the device enters the Shutdown
mode with asserted ALERT output, the output remains
active during shutdown. The device must be operating
in continuous conversion, with TA below THYST, for the
ALERT output to be deasserted.
5.3.4.5 Interrupt Mode
In Interrupt mode, the ALERT output is asserted when
TA is greater than TSET. However, the output is deas-
serted when the user performs a read from any
register. This mode is designed for interrupt-driven,
microcontroller-based systems. The microcontroller
receiving the interrupt will have to acknowledge the
interrupt by reading any register from the TCN75A.
This will clear the interrupt and the ALERT pin will
become deasserted. When TA drifts below THYST, the
TCN75A outputs another interrupt and the controller
needs to read a register to deassert the ALERT output.
Shutting down the device will also reset, or deassert,
the ALERT output.
TSET
TA
THYST
ALERT
Comparator mode
Active-low
ALERT
Interrupt mode
Active-low
Register
Read
*
* See Section 5.3.4.5 “Interrupt Mode”
DS21935D-page 24
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FIGURE 5-7:
Alert Output.
5.3.4.6 Fault Queue
The fault queue feature can be used as a filter to lessen
the probability of spurious activation of the ALERT pin.
TA must remain above TSET for the consecutive
number of conversion cycles selected using the Fault
Queue bits. Bit 3 and bit 4 of the CONFIG register can
be used to select up to six fault queue cycles. For
example, if six fault queues are selected, TA must be
greater than TSET for six consecutive conversions
before ALERT is asserted as a comparator or an inter-
rupt output.
This queue setting also applies for THYST. If six fault
queues are selected, TA must remain below THYST for
six consecutive conversions before ALERT is
deasserted (Comparator mode) or before another
interrupt is asserted (Interrupt mode).
5.3.4.7  ADC Resolution
The TCN75A provides access to select the ADC
resolution from 9-bit to 12-bit (0.5°C to 0.0625°C
resolution) using bit 6 and bit 5 of the CONFIG register.
The user can gain better insight into the trends and
characteristics of the ambient temperature by using a
finer resolution. Increasing the resolution also reduces
the quantization error. Figure 2-3 shows accuracy
versus resolution.
Table 5-3 shows the TA register conversion time for the
corresponding resolution.
TABLE 5-3:
Bits
9
10
11
12
RESOLUTION AND
CONVERSION TIME
Resolution
0.5
0.25
0.125
0.0625
tCONV (typical)
30 ms
60 ms
120 ms
240 ms
TCN75A
5.4 Summary of Power-up Condition
The TCN75A has an internal Power-on Reset (POR)
circuit. If the power supply voltage VDD glitches down
to the 1.7V (typical) threshold, the device resets the
registers to the power-up default settings.
Table 5-4 shows the power-up default summary.
TABLE 5-4:
Register
TA
TSET
THYST
Pointer
CONFIG
POWER-UP DEFAULTS
Data
(Hex)
0000
A000
9600
00
00
Power-up Defaults
0°C
80°C
75°C
Temperature register
Continuous Conversion
Comparator mode
Active-low Output
Fault Queue 1
9-bit Resolution
At power-up, the TCN75A has an inherent 2 ms
(typical) power-up delay before updating the registers
with default values and start a conversion cycle. This
delay reduces register corruption due to unsettled
power. After power-up, it takes tCONV for the TCN75A
to update the TA register with valid temperature data.
2010 Microchip Technology Inc.
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TCN75A
NOTES:
DS21935D-page 26
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6.0 APPLICATIONS INFORMATION
6.1 Connecting to the Serial Bus
The SDA and SCL serial interface are open-drain pins
that require pull-up resistors. This configuration is
shown in Figure 6-1.
PIC®
MCU
VDD
TCN75A
RR
SDA
SCL
FIGURE 6-1:
Interface.
Pull-up Resistors On Serial
The TCN75A is designed to meet 0.4V (maximum)
voltage drop at 3 mA of current. This allows the
TCN75A to drive lower values of pull-up resistors and
higher bus capacitance. In this application, all devices
on the bus must meet the same pull-down current
requirements.
6.2 Typical Application
Microchip provides several microcontroller product
lines with Master Synchronous Serial Port Modules
(MSSP) that include the I2C interface mode. This
module implements all master and slave functions and
simplifies the firmware development overhead.
Figure 6-2 shows a typical application using the
PIC16F737 as a master to control other Microchip
slave products, such as EEPROM, fan speed
controllers and the TCN75A temperature sensor
connected to the bus.
SDA SCL
PIC16F737
Microcontroller
TC654
Fan Speed
Controller
24LC01
EEPROM
TCN75A
Temperature
Sensor
FIGURE 6-2:
Bus.
Multiple Devices on I2C™
TCN75A
The ALERT output can be wire-ORed with a number of
other open-drain devices. In such applications, the
output needs to be programmed as an active-low
output. Most systems will require pull-up resistors for
this configuration.
6.3 Layout Considerations
The TCN75A does not require any additional
components besides the master controller in order to
measure temperature. However, it is recommended
that a decoupling capacitor of 0.1 µF to 1 µF be used
between the VDD and GND pins. A high-frequency
ceramic capacitor is recommended. It is necessary for
the capacitor to be located as close as possible to the
power pins in order to provide effective noise
protection.
For applications where a switching regulator is used to
power the sensor, it is recommended to add a 200
resistor in series to VDD to filter out the switcher noise
from the sensor. It is also recommended to add the
series resistor in applications where a linear regulator
is used to step-down a switching regulator voltage to
power the sensor. For example, if a linearly regulated
3.3V from a 5V switching regulator is used to power the
sensor, add a 200series resistor (refer to Figure 6-3).
Switching
Regulator
TCN75A
200
0.1µF
bypass
VDD
Switching
Regulator
TCN75A
200
Linear
Regulator 0.1µF
bypass
VDD
FIGURE 6-3:
Single Resistor.
Power-supply Filter using a
6.4 Thermal Considerations
The TCN75A measures temperature by monitoring the
voltage of a diode located in the die. A low-impedance
thermal path between the die and the Printed Circuit
Board (PCB) is provided by the pins. Therefore, the
TCN75A effectively monitors the temperature of the
PCB. However, the thermal path for the ambient air is
not as efficient because the plastic device package
functions as a thermal insulator.
A potential for self-heating errors can exist if the
TCN75A SDA and SCL communication lines are
heavily loaded with pull-ups. Typically, the self-heating
error is negligible because of the relatively small
current consumption of the TCN75A. However, in order
to maximize the temperature accuracy, the SDA and
SCL pins need to be lightly loaded.
2010 Microchip Technology Inc.
DS21935D-page 27


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TCN75A
NOTES:
DS21935D-page 28
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7.0 PACKAGING INFORMATION
7.1 Package Marking Information
8-Lead MSOP
XXXXX
YWWNNN
8-Lead SOIC (150 mil)
XXXXXXXX
XXXXYYWW
NNN
TCN75A
Example:
N75A/E
018256
Example:
TCN75AV
OA^e^31018
256
Legend:
XX...X
Y
YY
WW
NNN
e3
*
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
2010 Microchip Technology Inc.
DS21935D-page 29


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TCN75A
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