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
Table 18.
AO[3:0]
Decimal
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Frequency correction at 25C, typical
Binary
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
[1] Default value.
ppm
+8
+7
+6
+5
+4
+3
+2
+1
[1] 0
1
2
3
4
5
6
7
8.5 General purpose 512 bytes static RAM
The PCF2127 contains a general purpose 512 bytes static RAM. This integrated SRAM is
battery backed and can therefore be used to store data which is essential for the
application to survive a power outage.
9 bits, RA[8:0], define the RAM address pointer in registers RAM_addr_MSB and
RAM_addr_LSB. The register address pointer increments after each read or write
automatically up to 1Bh and then wraps around to address 00h (see Figure 5 on page 6).
Data is transferred to or from the RAM by the interface. To write to the RAM, the register
RAM_wrt_cmd, to read from the RAM the register RAM_rd_cmd must be addressed
explicitly.
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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