PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 8

• Manufacturer Part Number: PCF2127AT/1,518
• Description: IC RTC/CALENDAR TCXO QTZ 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2127AT/1,518

• Package / Case: 20-SOIC (0.300", 7.50mm Width)
• Time Format: HH:MM:SS (12/24 hr)
• Memory Size: 512B
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Serial Clock, Timestamp, Timekeeper, Watchdog, Alarm, Calendar, Timer, Timer Interrupt
• Rtc Memory Size: 512 bytes
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Mounting Style: SMD/SMT
• Rtc Bus Interface: I2C
• Supply Current: 2600 nA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NXP Semiconductors
Table 4.
Bit positions labeled as - are not implemented and will return a 0 when read. Bit T must always be written with logic 0. Bits
labeled as X are undefined at power-on and unchanged by subsequent resets.
PCF2127A_2
Product data sheet
Address Register name
14h
15h
16h
17h
18h
Aging offset register
19h
RAM registers
1Ah
1Bh
1Ch
1Dh
Min_timestp
Hour_timestp
Day_timestp
Mon_timestp
Year_timestp
Aging_offset
RAM_addr_MSB -
RAM_addr_LSB
RAM_wrt_cmd
RAM_rd_cmd
Register overview
Bit
7
-
-
-
-
-
RA[7:0]
X
X
YEAR_TIMESTP (0 to 99)
…continued
MINUTE_TIMESTP (0 to 59)
-
-
-
-
X
X
6
-
All information provided in this document is subject to legal disclaimers.
AMPM
DAY_TIMESTP (1 to 31)
5
HOUR_TIMESTP (0 to 23) in 24 h mode
-
-
-
X
X
Rev. 02 — 7 May 2010
4
HOUR_TIMESTP (1 to 12) in 12 h mode
MONTH_TIMESTP (1 to 12)
-
-
X
X
3
AO[3:0]
-
X
X
Integrated RTC, TCXO and quartz crystal
2
-
X
X
1
-
X
X
PCF2127A
0
RA8
X
X
© NXP B.V. 2010. All rights reserved.
0000 0000
Reset value
- XXX XXXX
- - XX XXXX
- - XX XXXX
- - XX XXXX
- - - X XXXX
XXXX XXXX
- - - - 1000
- - - - - - - 0
XXXX XXXX
XXXX XXXX
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