PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet - Page 16

• Manufacturer Part Number: PCF2129AT/1,512
• Description: IC REAL TIME CLK/CALENDAR 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2129AT/1,512

• Package / Case: 20-SOIC (7.5mm Width)
• Date Format: YY-MM-DD-dd
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-4960-5; 935288599512

NXP Semiconductors
PCF2129A_2
Product data sheet
8.5.1.1 Standard mode
8.5.1.2 Direct switching mode
When a power failure condition occurs and the power supply switches to the battery the
following sequence occurs:
The interface is disabled in battery backup operation:
If V
If V
If V
If V
1. The battery switch flag BF (register Control_3) is set logic 1.
2. An interrupt is generated if the control bit BIE (register Control_3) is enabled
3. If the control bit BTSE (register Control_3) is logic 1, the timestamp registers store the
4. The battery switch flag BF is cleared via the interface; it must be cleared to clear the
Fig 4.
•
•
V
DD
DD
DD
DD
DD
V
(see
time and date when the battery switch occurred (see
interrupt.
Interface inputs are not recognized, preventing extraneous data being written to the
device
Interface outputs are high-impedance
(= 2.5 V)
th(sw)bat
(= 0 V)
> V
< V
> V
< V
V
V
INT
BAT
BF
DD
Section
Battery switch-over behavior in standard mode with bit BIE set logic 1 (enabled)
BAT
BAT
BAT
BAT
backup battery operation
OR V
AND V
the internal power supply is V
the internal power supply is V
All information provided in this document is subject to legal disclaimers.
8.12.6).
V
DD
BBS
DD
> V
< V
Rev. 02 — 7 May 2010
th(sw)bat
th(sw)bat
the internal power supply is V
the internal power supply is V
internal power supply (= V
DD
BAT
Integrated RTC, TCXO and quartz crystal
.
.
BBS
Section
)
DD
BAT
8.11.4).
.
PCF2129A
.
cleared via interface
© NXP B.V. 2010. All rights reserved.
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V
16 of 69
BBS