MPL115A1 Datasheet PDF - Freescale Semiconductor


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MPL115A1
Freescale Semiconductor

Part Number MPL115A1
Description Miniature SPI Digital Barometer
Page 8 Pages

MPL115A1 datasheet pdf
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Freescale Semiconductor
Pressure
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MPL115A1
Rev 3, 08/2009
Miniature SPI Digital Barometer
The MPL115A1 is an absolute pressure sensor with digital output for low cost
applications. A miniature 5 x 3 x 1.2 mm LGA package ideally suits it for portable
electronics and space constrained applications. Low current consumptions of
5 μA during Active mode and 1 μA during Shutdown (Sleep) mode target battery
and other low-power applications. A wide operating temperature range from -40°C
to +105°C fits demanding environmental requirements.
MPL115A1 employs a MEMS pressure sensor with a conditioning IC to provide
accurate pressure measurement from 50 to 115 kPa. An integrated ADC provides
digitized temperature and pressure sensor outputs via a SPI port. Calibration Data
is stored in internal ROM. Utilizing raw sensor output, the host microcontroller
executes a compensation algorithm to render Compensated Absolute Pressure
with 1 kPa accuracy.
The MPL115A1 pressure sensor’s small form factor, low power capability,
precision, and digital output optimize it for barometric measurement applications.
Features
• Digitized pressure and temperature information together with programmed
calibration coefficients for host micro use.
• Factory Calibrated
• 50 kPa to 115 kPa Absolute Pressure
• 1 kPa Accuracy
• 2.375 V to 5.5 V Supply
• Integrated ADC
• SPI Interface
• Monotonic Pressure and Temperature Data Outputs
• Surface Mount RoHS Compliant Package
MPL115A1
50 to 115 kPa
Application Examples
• Barometry (portable and desk-top)
• Altimeters
• Weather Stations
• Hard Disk-Drives (HDD)
• Industrial Equipment
• Health Monitoring
• Air Control Systems
Device Name
MPL115A1T1
Package Options
Tape & Reel
ORDERING INFORMATION
Case No.
# of Ports
None Single
Dual
2015
Pressure Type
Gauge Differential Absolute
Digital
Interface
SPI
LGA PACKAGE
MPL115A1
5.0 mm X 3.0 mm X 1.2 mm MAX
VDD
CAP
GND
SHDN
1
2
3
4
8 SCLK
7 DIN
6 DOUT
5 CS
PIN CONNECTIONS
Pin Description
PIN NAME
FUNCTION
1 VDD VDD Power Supply Connection.
2 CAP External Capacitor
3 GND Ground
4 SHDN Shutdown (Sleep): Connect to GND to disable the device.
When in shut down the part draws < 1μA supply current
5 CS CS: SPI Chip Select line.
6 DOUT DOUT: Serial data output.
7 DIN DIN: Serial data input.
8 SCLK SPI Serial Clock Input.
© Freescale Semiconductor, Inc., 2009. All rights reserved.



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Pressure
Maximum Ratings
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Voltage (with respect to GND unless otherwise noted)
VDD .............................................................................................................................. -0.3 V to +5.5 V
SCLK, CS, DIN, DOUT ................................................................................................. -0.3 V to VDD+0.3 V
Operating Temperature Range .................................................................................... -40°C to +105°C
Storage Temperature Range........................................................................................ -40°C to +125°C
Overpressure ............................................................................................................... 1000 kPa
Operating Characteristics
(VDD = 2.375 V to 5.5 V, TA = -40°C to +105°C, unless otherwise noted. Typical values are at VDD = 3.3 V, TA = +25°C.
Ref
Parameters
Symbol
Conditions
Min Typ
Max
Units
1 Operating Supply Voltage
2 Supply Current
VDD
IDD Shutdown (SHDN = GND)
Standby
Average – at one measurement per second
2.375
3.3 5.5
—1
3.5 10
5—
V
μA
μA
μA
Pressure Sensor
3 Range
50
— 115
kPa
4 Resolution
— 0.15 — kPa
5 Accuracy
-20ºC to 85ºC
±1 —
kPa
6 Conversion Time
(Start Pressure Convert)
tcp Time between start convert command and
data available in the Pressure register
0.6 0.7
ms
Temperature Sensor
7 Range
-40
— 105
ºC
8 Conversion Time
(Start Temperature Convert)
tct Time between start convert command and
data available in the Temperature register
0.6 0.7
ms
9 Conversion Time
(Start Both Convert)
tcb Time between start convert command and
data available in the Pressure and
Temperature registers
0.8 1
ms
10 Resolution
Temperature ADC is 472 counts at 25ºC
-5.35
— counts/ºC
SPI Inputs: SCLK, CS, DIN
11 SCLK Clock Frequency
12 Low Level Input Voltage
13 High Level Input Voltage
SPI Outputs: DOUT
14 Low Level Output Voltage
fSCLK (1)
VIL
VIH
VOL1 At 3 mA sink current
0.7VDD
— 8 MHz
— 0.3VDD
——
V
V
0
— 0.4
V
VOL2 At 6 mA sink current
0 — 0.6
15 High Level Output Voltage
VOH1 At 3 mA source current
1. Nominal maximum SPI clock frequency.
VDD – 0.4 V —
V
MPL115A1
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Diff
Amp
Temp
Sensor
Coefficient
Storage
ADDR
ADDR
ADDR
ADC
ADDR Pressure
ADDR Temperature
SPI
Interface
Pressure
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VDD
VDD
1 μF
CAP
CAP
1 μF
SHDN
SHDN
SSCCLLKK
DIN
DIN
DOUT
DOUT
CS
CS
GND
GND
μC
Microcontroller
Figure 1. Uncompensated Pressure Sensor Schematic
Compensation
The pressure compensation for MPL115A1 is based on a 2-dimensional, second order polynomial based on Microsystems
mst_trimlib library.
The 10-bit compensated pressure output, Pcomp, is calculated as follows:
Pcomp = a0 + (b1 + c11*Padc + c12*Tadc) * Padc + (b2 + c22*Tadc) * Tadc
Where:
Padc is the 10-bit pressure output of the MPL115A1 ADC,
Tadc is the 10-bit temperature output of the MPL115A1 ADC,
a0 is the pressure offset coefficient,
b1 is the pressure sensitivity coefficient,
c11 is the pressure linearity (2nd order) coefficient,
c12 is the coefficient for temperature sensitivity coefficient (TCS),
b2 is the 1st order temperature offset coefficient (TCO),
c22 is the 2nd order temperature offset coefficient.
Ideally, Pcomp will produce a value of 0 with an input pressure of 50 kPa and will produce a full-scale value of 1023 with an input
pressure of 115 kPa.
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Pressure
Coefficient Bit-Width Specs
The table below specifies the initial coefficient bit-width specs for the compensation algorithm.
Total Bits
Sign Bits
Integer Bits
Fractional Bits
dec pt zero pad
a0
16
1
12
3
10-bit Output: Compensation Coefficient Specs
b1 b2 c12
16 16
14
11
1
21
0
13 14
13
——
9
c11
11
1
0
11
11
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Total
Coeff.
c22 Bits
11 84
1
0
10
15
Example Binary Format Definitions:
1. Sign = 0, Integer Bits = 8, Fractional Bits = 4 :
Coeff = S I7 I6 I5 I4 I3 I2 I1 I0 . F3 F2 F1 F0
2. Sign = 1, Integer Bits = 4, Fractional Bits = 7 :
Coeff = S I3 I2 I1 I0 . F6 F5 F4 F3 F2 F1 F0
3. Sign = 0, Integer Bits = 0, Fractional Bits = 6, dec pt zero pad = 2 : Coeff = S 0 . 0 0 F5 F4 F3 F2 F1 F0
4. Sign = 0, Integer Bits = 0, Fractional Bits = 5, dec pt zero pad = 3 : Coeff = S 0 . 0 0 0 F4 F3 F2 F1 F0
NOTE: Negative coefficients (Sign = 1) are coded in 2’s complement notation.
Coefficient Address Map
Address
Coefficient
$04 a0 MS Byte
$05 a0 LS Byte
$06 b1 MS Byte
$07 b1 LS Byte
$08 b2 MS Byte
$09 b2 LS Byte
$0A c12 MS Byte
$0B c12 LS Byte
$0C c11 MS Byte
$0D c11 LS Byte
$0E c22 MS Byte
$0F c22 LS Byte
For coefficients with less than 16 bits, the lower lsbs are zero. For example, c11 is 11 bits and is stored into 2 bytes as follows:
c11 MS byte = c11[10:3] = [c11b10 , c11b9 , c11b8 , c11b7 , c11b6 , c11b5 , c11b4 , c11b3]
NOTE: c11 LS byte = c11[2:0] & “00000” = [c11b2 , c11b1 , c11b0 , 0 , 0 , 0 , 0 , 0]
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