PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 16

• 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
8.5.1.2 Direct switching mode
8.5.1.3 Battery switch-over disabled: only one power supply (V
If V
If V
The direct switching mode is useful in systems where V
This is not recommended if the V
V
the standard mode because the monitoring of V
When the battery switch-over function is disabled:
Fig 5.
BAT
•
•
•
•
V
DD
DD
DD
V
The power supply is applied on the V
The V
The internal power supply, available at the output pin BBS, is equal to V
The battery flag (BF) is always logic 0
(= 2.5 V)
th(sw)bat
 3.0 V). In direct switching mode, the power consumption is reduced compared to
(= 0 V)
> V
< V
V
V
INT
BAT
BF
DD
Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)
BAT
BAT
BAT
backup battery operation
the internal power supply is V
the internal power supply is V
pin must be connected to ground
All information provided in this document is subject to legal disclaimers.
V
BBS
Rev. 5 — 12 February 2013
DD
and V
internal power supply (= V
DD
BAT
DD
BAT
pin
values are similar (for example, V
Integrated RTC, TCXO and quartz crystal
.
.
DD
and V
DD
th(sw)bat
BBS
is higher than V
DD
)
)
is not performed.
PCF2129AT
cleared via interface
© NXP B.V. 2013. All rights reserved.
BAT
DD
at all times.
DD
001aaj312
= 3.3 V,
V
16 of 73
BBS