PCF2127AT/1,512 NXP Semiconductors, PCF2127AT/1,512 Datasheet - Page 2

• Manufacturer Part Number: PCF2127AT/1,512
• Description: IC REAL TIME CLK/CALENDAR 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2127AT/1,512

• Package / Case: 20-SOIC (7.5mm Width)
• Date Format: YY-MM-DD-dd
• Memory Size: 512B
• Time Format: HH:MM:SS (12/24 hr)
• Interface: I²C, SPI
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Clock, Alarm, Watchdog, Timestamp
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C, SPI
• Supply Current: 800 uA
• Bus Type: Serial (3-Wire, SPI)
• Package Type: SO
• Operating Supply Voltage (min): 1.8V
• Operating Temperature Classification: Industrial
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Pin Count: 20
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 568-4961-5

Having an on-chip TCXO eliminates the need for a discrete
quartz and improves accuracy, since external quartzes are
often subject to strong temperature dependencies and can
impact performance. The circuit doesn’t have to be calibrated,
either. Every aRTC is calibrated at the factory during a final test
sequence. All the designer needs to do is set the clock for the
appropriate time zone.
The time-stamp function makes it possible to log the exact time
of external events. The stamp can be configured to latch the
Block diagram PCF2127A
Comparison of PCF2127A and PCF2129A
Ordering Information
www.nxp.com
CLKOUT
SDA/CE
Characteristics
Supply voltage range
Battery supply voltage range
Watchdog & countdown timer
System reset
RAM
Accuracy within temperature range -20 … +70° C min
Type
PCF2127AT/1
PCF2129AT/1
PCA2129T/Q900/1
V
BBS
RST
SDO
V
SCL
V
BAT
SDI
IFS
PFI
DD
TS
SS
(internal)
SDA/CE
1.25 V
SCL
PFO
BATTERY BACK UP
SWITCH-OVER
OSCILLATOR
SELECTORS
SERIAL BUS
INTERFACE
INTERFACE
INTERFACE
CIRCUITRY
MONITOR
I
2
C BUS
SDA/CE
TEMP
32.768 kHz
SDO
SCL
SDI
© 2009 NXP B.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and
reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use.
Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
OSCO
OSCI
TEMPERATURE
internal
power
supply
RESET
STATIC RAM
512 BYTES
SENSOR
TCXO
TEMP
Package tape and reel
SO20, plastic small outline package, body width 7.5 mm
PCF2128
SO20, plastic small outline package, body width 7.5 mm
SO20, plastic small outline package, body width 7.5 mm
TEST
REGISTER
CONTROL
ADDRESS
DIVIDER
TIMER
LOGIC
AND
1 Hz
PCF2127A
1.8 – 4.2 V
1.8 – 4.2 V
Yes
Yes
512 Byte
± 5ppm
INT
Watchdg_tim_ctl
Watchdg_tim_val
RAM_addr_MSB
Weekday_alarm
RAM_addr_LSB
Second_alarm
RAM_wrt_cmd
Minute_alarm
Crystal_aging
RAM_rd_cmd
Hour_timestp
Mon_timestp
Year_timestp
CLKOUT_ctl
Sec_timestp
Min_timestp
Day_timestp
Hour_alarm
Timestp_ctl
Day_alarm
Weekdays
Control_1
Control_2
Control_3
Seconds
Minutes
Months
Hours
Years
Days
001aag059
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
PCF2129A
1.8 – 4.2 V
1.8 – 4.2 V
Watchdog only
No
No
± 5ppm
first or last event and can record the time when the back-up
battery was switched in.
The precise Watchdog function can be used to wake the
microcontroller from hibernation mode or for independent
monitoring of microcontroller tasks. The calendar functions track
year, month, date, and day with built-in Leap Year flags. There is a
freely programmable alarm and timer function, so designers have
the option to generate a wake-up signal on an interrupt pin.
Qualification
Industrial
Industrial
AEC-Q100 compliant
Date of release: May 2009
Document order number : 9397 750 16659
Printed in the Netherlands
Version
1
1
1