PCF2129AT/2,518 NXP Semiconductors, PCF2129AT/2,518 Datasheet - Page 25

• 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
8.8.6 Register Months
8.8.7 Register Years
8.8.8 Setting and reading the time
Table 23.
Table 24.
Table 25.
Figure 13
During read/write operations, the time counting circuits (memory locations 03h through
09h) are blocked.
This prevents
Bit
3 to 0
Month
Bit
7 to 5 -
4
January
February
March
April
May
June
July
August
September
October
November
December
7 to 4 YEARS
3 to 0
•
•
Faulty reading of the clock and calendar during a carry condition
Incrementing the time registers during the read cycle
Symbol
MONTHS
Symbol
shows the data flow and data dependencies starting from the 1 Hz clock tick.
Months - months register (address 08h) bit description
Month assignments in BCD format
Years - years register (address 09h) bit description
Upper-digit
(ten’s place)
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 12 February 2013
Value
-
0 to 1
0 to 9
Value
0 to 9
0 to 9
Digit (unit place)
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
Place value Description
-
ten’s place
unit place
Place value Description
ten’s place
unit place
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
Integrated RTC, TCXO and quartz crystal
unused
actual month coded in BCD format, see
Table 24
actual year coded in BCD format
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
PCF2129AT
© NXP B.V. 2013. All rights reserved.
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
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