PCF2127A Datasheet PDF - NXP Semiconductors


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PCF2127A
NXP Semiconductors

Part Number PCF2127A
Description TCXO and quartz crystal
Page 30 Pages

PCF2127A datasheet pdf
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PCF2127A
Integrated RTC, TCXO and quartz crystal
Rev. 02 — 7 May 2010
www.DataSheet4U.com
Product data sheet
1. General description
The PCF2127A is a CMOS1 Real Time Clock (RTC) and calendar with an integrated
Temperature Compensated Crystal (Xtal) Oscillator (TCXO) and a 32.768 kHz quartz
crystal optimized for very high accuracy and very low power consumption. The PCF2127A
has 512 bytes of general purpose static RAM, a selectable I2C-bus or SPI-bus, a backup
battery switch-over circuit, a programmable watchdog function, a timestamp function, and
many other features.
2. Features and benefits
„ Temperature Compensated Crystal Oscillator (TCXO) with integrated capacitors
„ Typical accuracy: ±3 ppm from 15 °C to +60 °C
„ Integration of a 32.768 kHz quartz crystal and oscillator in the same package
„ Provides year, month, day, weekday, hours, minutes, and seconds
„ 512 bytes of general purpose static RAM
„ Timestamp function
‹ with interrupt capability
‹ detection of two different events on one multilevel input pin (e.g. for tamper
detection)
„ Two line bidirectional 400 kHz Fast-mode I2C-bus interface (IOL = 3 mA at pin
SDA/CE)
„ 3 line SPI-bus with separate data input and output (maximum speed 6.5 Mbit/s)
„ Battery backup input pin and switch-over circuitry
„ Battery backed output voltage pin
„ Battery low detection function
„ Extra power fail detection function with input and output pins
„ Power-On Reset Override (PORO)
„ Oscillator stop detection function
„ Interrupt output and system reset pin (open-drain)
„ Programmable 1 second or 1 minute interrupt
„ Programmable countdown timer with interrupt capability
„ Programmable watchdog timer with interrupt and reset capability
„ Programmable alarm function with interrupt capability
„ Programmable square wave open-drain output pin
„ Clock operating voltage: 1.2 V to 4.2 V
„ Low supply current: typical 0.65 μA at VDD = 3.0 V and Tamb = 25 °C
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.



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PCF2127A
Integrated RTC, TCXO and quartz crystal
„ Automatic leap year correction
3. Applications
„ Electronic metering for electricity, water, and gas
„ Timekeeping instruments with high precision
„ GPS equipment to reduce time to first fix
„ Applications that require an accurate process timing
„ Products with long automated unattended operation time
4. Ordering information
Table 1. Ordering information
Type number Package
Name Description
PCF2127AT/1 SO20 plastic small outline package; 20 leads; body width 7.5 mm
Version
SOT163-1
5. Marking
Table 2. Marking codes
Type number
PCF2127AT/1
Marking code
PCF2127AT
PCF2127A_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
© NXP B.V. 2010. All rights reserved.
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6. Block diagram
CLKOUT
OSCI
32.768 kHz
OSCO
TCXO
BBS
VDD
VBAT
VSS
RST
BATTERY BACK UP
SWITCH-OVER
CIRCUITRY
OSCILLATOR
MONITOR
internal
power
supply
TEMP
RESET
SPI-BUS
INTERFACE
SDA/CE
SDO
SDI
SCL
IFS
TS
PFI
1.25 V
(internal)
SERIAL BUS
INTERFACE
SELECTOR
I2C-BUS
INTERFACE
SCL
SDO
SDI
SDA/CE
TEMP
PCF2127A
512 BYTES
STATIC RAM
TEMPERATURE
SENSOR
PFO
Fig 1. Block diagram of PCF2127A
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PCF2127A
Integrated RTC, TCXO and quartz crystal
INT
DIVIDER
AND
TIMER
1 Hz
LOGIC
CONTROL
ADDRESS
REGISTER
RPU
Control_1
Control_2
Control_3
Seconds
Minutes
Hours
Days
Weekdays
Months
Years
Second_alarm
Minute_alarm
Hour_alarm
Day_alarm
Weekday_alarm
CLKOUT_ctl
Watchdg_tim_ctl
Watchdg_tim_val
Timestp_ctl
Sec_timestp
Min_timestp
Hour_timestp
Day_timestp
Mon_timestp
Year_timestp
Aging_offset
RAM_addr_MSB
RAM_addr_LSB
RAM_wrt_cmd
RAM_rd_cmd
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
18h
19h
1Ah
1Bh
1Ch
1Dh
TEST
001aaj675
PCF2127A_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
© NXP B.V. 2010. All rights reserved.
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7. Pinning information
7.1 Pinning
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PCF2127A
Integrated RTC, TCXO and quartz crystal
SCL 1
SDI 2
SDO 3
SDA/CE 4
IFS 5
TS 6
CLKOUT 7
VSS 8
n.c. 9
n.c. 10
PCF2127A
20 VDD
19 VBAT
18 BBS
17 INT
16 RST
15 PFI
14 PFO
13 TEST
12 n.c.
11 n.c.
001aaj676
Top view. For mechanical details, see Figure 53.
Fig 2. Pin configuration for SO20 (PCF2127A)
7.2 Pin description
Table 3. Pin description of SO20 (PCF2127A)
Symbol
Pin Description
SCL 1 combined serial clock input for both I2C-bus and SPI-bus; may
float when SDA/CE inactive
SDI 2 serial data input for SPI-bus; may float when SDA/CE inactive
SDO
3 serial data output for SPI-bus, push-pull
SDA/CE
4
combined serial data input and output for the I2C interface and chip
enable input (active LOW) for the SPI-bus
IFS 5 interface selector input
connect to pin VSS to select the SPI-bus
connect to pin BBS to select the I2C interface
TS
CLKOUT
6
7
timestamp input (active LOW) with 200 kΩ internal pull-up resistor
(RPU)
clock output (open-drain)
VSS 8 ground supply voltage
n.c. 9 to 12 not connected; do not connect; do not use as feed through
TEST
13 do not connect; do not use as feed through
PFO
14 power fail output (open-drain; active LOW)
PFI 15 power fail input
RST 16 reset output (open-drain; active LOW)
INT 17 interrupt output (open-drain; active LOW)
BBS 18 output voltage (battery backed)
VBAT
VDD
19 battery supply voltage (backup)
20 supply voltage
PCF2127A_2
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
© NXP B.V. 2010. All rights reserved.
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