PCA2129T/Q900/2,51 NXP Semiconductors, PCA2129T/Q900/2,51 Datasheet - Page 24

• Manufacturer Part Number: PCA2129T/Q900/2,51
• Description: Real Time Clock
• Manufacturer: NXP Semiconductors
• Series: PCA2129r

Specifications of PCA2129T/Q900/2,51

• 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: 1.8 V
• Maximum Operating Temperature: + 80 C
• Minimum Operating Temperature: - 30 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-16
• Battery Backup Switching: Yes

NXP Semiconductors
PCA2129T
Product data sheet
8.8.3 Register Hours
8.8.4 Register Days
8.8.5 Register Weekdays
Table 19.
[1]
Table 20.
[1]
Table 21.
Although the association of the weekdays counter to the actual weekday is arbitrary, the
PCA2129T will assume that Sunday is 000 and Monday is 001 for the purposes of
determining the increment for calendar weeks.
Table 22.
[1]
Bit
5
4
3 to 0
24 hour mode
5 to 4 HOURS
Bit
3 to 0
Bit
7 to 3 -
2 to 0 WEEKDAYS
Day
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
7 to 6 -
12 hour mode
3 to 0
7 to 6 -
5 to 4 DAYS
Hour mode is set by the bit 12_24 in register Control_1.
If the year counter contains a value which is exactly divisible by 4, including the year 00, the RTC
compensates for leap years by adding a 29
Definition may be reassigned by the user.
[1]
Symbol
AMPM
HOURS
Symbol
Symbol
Hours - hours register (address 05h) bit description
Days - days register (address 06h) bit description
Weekdays - weekdays register (address 07h) bit description
Weekday assignments
[1]
[1]
[1]
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 24 January 2013
Bit
2
0
0
0
0
1
1
1
Accurate RTC with integrated quartz crystal for automotive
Value
-
0
1
0 to 1
0 to 9
0 to 2
0 to 9
Value
-
0 to 3
0 to 9
Value
-
0 to 6
Description
unused
Place value Description
-
-
-
ten’s place
unit place
ten’s place
unit place
Place value Description
-
ten’s place
unit place
actual weekday value, see
th
day to February.
1
0
0
1
1
0
0
1
unused
indicates AM
indicates PM
actual hours coded in BCD format when in
12 hour mode
actual hours coded in BCD format when in
24 hour mode
unused
actual day coded in BCD format
Table 22
PCA2129T
0
0
1
0
1
0
1
0
© NXP B.V. 2013. All rights reserved.
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