PCF2127AT/1,518 NXP Semiconductors, PCF2127AT/1,518 Datasheet - Page 16

• 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
PCF2127A_2
Product data sheet
8.5.5.1
8.5.5.2 Reading from the RAM
8.5.5 Operation examples
Writing to the RAM
For details see
For details see
1. Set RAM address:
2. Send RAM write command:
3. Write data into the RAM:
1. Set RAM address:
2. Send RAM read command:
3. Read from the RAM:
– Select register RAM_addr_MSB (send address 1Ah).
– Set value for bit RA8 (data byte of register 1Ah).
– Set value for array RA[7:0] (data byte of register 1Bh).
– Select register RAM_wrt_cmd (send address 1Ch).
– Write n data byte into RAM.
– Select register RAM_addr_MSB (send address 1Ah).
– Set value for bit RA8 (data byte of register 1Ah).
– Set value for array RA[7:0] (data byte of register 1Bh).
– Select register RAM_rd_cmd (send address 1Dh).
– Read n data byte from the RAM.
Note: register address will be incremented automatically to 1Bh.
Note: register address will be incremented automatically to 1Bh.
Figure 44 on page
Figure 45 on page
All information provided in this document is subject to legal disclaimers.
Rev. 02 — 7 May 2010
60.
61.
Integrated RTC, TCXO and quartz crystal
PCF2127A
© NXP B.V. 2010. All rights reserved.
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