PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 22

• 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
The setting of the PORO mode requires that POR_OVRD in register Control_1 is set logic
1 and that the signals at the interface pins SDA/CE and SCL are toggled as illustrated in
Figure
Once the override mode is entered, the device is immediately released from the reset
state and the set-up operation can commence.
The PORO mode is cleared by writing logic 0 to POR_OVRD. POR_OVRD must be
logic 1 before a re-entry into the override mode is possible. Setting POR_OVRD logic 0
during normal operation has no effect except to prevent accidental entry into the PORO
mode.
Fig 12. Power-On Reset Override (PORO) sequence, valid for both I
reset override
SDA/CE
12. All timings shown are required minimum.
SCL
power up
8 ms
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 12 February 2013
minimum 500 ns
Integrated RTC, TCXO and quartz crystal
PCF2129AT
2
C-bus and SPI-bus
minimum 2000 ns
© NXP B.V. 2013. All rights reserved.
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