PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 37

• Manufacturer Part Number: PCF2127AT/1,518
• Description: IC RTC/CALENDAR TCXO QTZ 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2127AT/1,518

• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Time Format: HH:MM:SS (12/24 hr)
• Memory Size: 512B
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Serial Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
• Rtc Memory Size: 512 bytes
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C
• Supply Current: 2600 nA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
PCF2127A_2
Product data sheet
Remark: WDTF is read only and cannot be cleared with the interface. WDTF can be
cleared by:
Writing a logic 0 or logic 1 to WDTF has no effect.
Fig 21. WD_CD[1:0] = 10: watchdog activates an interrupt when timed out
Fig 22. WD_CD[1:0] = 11: watchdog activates a reset pulse when timed out
•
•
•
•
timer value
timer value
loading a value in register Watchdg_tim_val
reading of the register Control_2
When the watchdog timer counter reaches 1, the watchdog timer flag WDTF is set
logic 1
When a minute or second interrupt occurs, the minute/second flag MSF is set logic 1
(see
watchdog
watchdog
WDTF
WDTF
RST
INT
Section
Counter reached 1, WDTF is set logic 1, and an interrupt is generated.
Counter reached 1, WDTF is set logic 1, reset pulse on the RST pin is generated for a time equal
to t
w(rst)
.
All information provided in this document is subject to legal disclaimers.
8.13.1)
Rev. 02 — 7 May 2010
n = 1
n = 1
t
w(rst)
Integrated RTC, TCXO and quartz crystal
PCF2127A
© NXP B.V. 2010. All rights reserved.
MCU
MCU
001aag063
n
n
001aag062
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