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PCF2127 View Datasheet(PDF) - NXP Semiconductors.

Part Name
Description
MFG CO.
'PCF2127' PDF : 101 Pages View PDF
NXP Semiconductors
PCF2127
Accurate RTC with integrated quartz crystal for industrial applications
8.5.5 Operation examples
8.5.5.1 Writing to the RAM
1. Set RAM address:
Select register RAM_addr_MSB (send address 1Ah).
Set value for bit RA8 (data byte of register 1Ah).
Note: register address will be incremented automatically to 1Bh.
Set value for array RA[7:0] (data byte of register 1Bh).
2. Send RAM write command:
Select register RAM_wrt_cmd (send address 1Ch).
3. Write data into the RAM:
Write n data byte into RAM.
For details, see Figure 46 on page 69.
8.5.5.2 Reading from the RAM
1. Set RAM address:
Select register RAM_addr_MSB (send address 1Ah).
Set value for bit RA8 (data byte of register 1Ah).
Note: register address will be incremented automatically to 1Bh.
Set value for array RA[7:0] (data byte of register 1Bh).
2. Send RAM read command:
Select register RAM_rd_cmd (send address 1Dh).
3. Read from the RAM:
Read n data byte from the RAM.
For details, see Figure 47 on page 70.
8.6 Power management functions
The PCF2127 has two power supplies:
VDD the main power supply
VBAT the battery backup supply
Internally, the PCF2127 is operating with the internal operating voltage Voper(int) which is
also available as VBBS on the battery backed output voltage pin, BBS. Depending on the
condition of the main power supply and the selected power management function,
Voper(int) is either on the potential of VDD or VBAT (see Section 8.6.4).
PCF2127
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 8 — 19 December 2014
© NXP Semiconductors N.V. 2014. All rights reserved.
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