PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 37

• Manufacturer Part Number: PCF2129AT/2,518
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCF2129r

Specifications of PCF2129AT/2,518

• Rohs: yes
• Function: Clock, Calendar, Alarm, Watchdog, Timestamp
• Rtc Bus Interface: I2C, SPI
• Date Format: Binary
• Time Format: Binary
• Supply Voltage - Max: 4.2 V
• Supply Voltage - Min: 1.2 V
• Maximum Operating Temperature: + 60 C
• Minimum Operating Temperature: - 15 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-20
• Battery Backup Switching: Yes
• Factory Pack Quantity: 2000

NXP Semiconductors
PCF2129AT
Product data sheet
8.11.4 Dependency between Battery switch-over and timestamp
The timestamp function depends on the control bit BTSE in register Control_3:
Table 45.
[1]
BTSE BF
1
0
Default value.
-
0
1
Battery switch-over and timestamp
[1]
[1]
All information provided in this document is subject to legal disclaimers.
Description
the battery switch-over does not affect the timestamp registers
If a battery switch-over event occurs:
the timestamp registers store the time and date when the switch-over occurs;
after this event occurred BF is set logic 1
the timestamp registers are not modified;
in this condition subsequent battery switch-over events or falling edges on pin
TS are not registered
Rev. 5 — 12 February 2013
Integrated RTC, TCXO and quartz crystal
PCF2129AT
© NXP B.V. 2013. All rights reserved.
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