PCF2127TSLASH2Y datasheet(15/100 Pages) PHILIPS

15 / 100 page

PCF2127

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Product data sheet

Rev. 8 — 19 December 2014

15 of 100

NXP Semiconductors

PCF2127

Accurate RTC with integrated quartz crystal for industrial applications

[1]

Default value.

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.

Table 18.

Frequency correction at 25

C, typical

AO[3:0]

ppm

Decimal

Binary

00000

10001

20010

30011

40100

50101

60110

70111

81000

[1] 0

91001

1

1010

2

1011

3

1100

4

1101

5

1110

6

1111

7

PCF2127T/2Y Datasheet(PDF) 15 Page - NXP Semiconductors

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