PCF2129AT/1,512 NXP Semiconductors, PCF2129AT/1,512 Datasheet - Page 18

• 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
8.5.2 Battery backup supply
The internal power supply (available on pin BBS) is equal to V
assured that there are decoupling capacitors on the pins V
The V
on the selected battery switch-over function mode:
Table 14.
Battery switch-over function mode
standard
direct switching
disabled
Fig 6.
Fig 7.
V
BBS
BBS
(mV)
−200
−400
−600
−800
− V
Battery switch-over circuit, simplified block diagram
Typical driving capability of V
current I
voltage on the output pin BBS is equal to the internal power supply, depending
0
DD
Output pin BBS
0
V
V
th(sw)bat
th(sw)bat
All information provided in this document is subject to legal disclaimers.
V
V
BAT
DD
BBS
comparators
Rev. 02 — 7 May 2010
V
V
CC
CC
2
LOGIC
BBS
Conditions
V
V
V
V
V
only V
DD
DD
DD
DD
BAT
logic
: (V
> V
< V
> V
< V
must be put to ground
4
BBS
DD
V
Integrated RTC, TCXO and quartz crystal
BAT
BAT
BAT
BAT
DD(int)
V
available,
V
BAT
− V
DD
OR V
AND V
DD
) with respect to the output load
DD
DD
switches
V
V
> V
DD(int)
DD(int)
DD
< V
th(sw)bat
6
, V
th(sw)bat
DD
BAT
V
or V
V
V
DD
I
BBS
DD
DD
(internal
power supply)
, and BBS.
PCF2129A
= 4.2 V
V
= 3 V
= 2 V
BAT
(mA)
BBS
001aag061
© NXP B.V. 2010. All rights reserved.
001aaj327
. It has to be
V
V
V
V
V
V
BBS
DD
BAT
DD
BAT
DD
8
equals
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