PCF8564A datasheet(19/59 Pages) NXP

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PCA85063A

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Product data sheet

Rev. 4 — 30 March 2018

19 of 59

NXP Semiconductors

PCA85063A

Automotive Real-Time Clock/calendar with alarm function and I2C-bus

8.2.4 Register RAM_byte

The PCA85063A provides a free RAM byte, which can be used for any purpose, for

example, status byte of the system.

[1]

Default value.

8.3 Time and date registers

Most of the registers are coded in the BCD format to simplify application use.

8.3.1 Register Seconds

[1]

Default value.

With the offset calibration an accuracy of

2 ppm (0.5  offset per LSB) can be reached (see

Table 13).

1 ppm corresponds to a time deviation of 0.0864 seconds per day.

(1) 3 correction pulses in MODE = 0 correspond to

13.02 ppm.

(2) 4 correction pulses in MODE = 1 correspond to

16.276 ppm.

(3) Reachable accuracy zone.

Fig 10. Result of offset calibration

Table 18.

RAM_byte - 8-bit RAM register (address 03h) bit description

Bit

Symbol

Value

Description

7 to 0

B[7:0]

00000000[1] to

11111111

RAM content

Table 19.

Seconds - seconds register (address 04h) bit description

Bit

Symbol

Value

Place value Description

7OS

oscillator stop

clock integrity is guaranteed

1[1]

clock integrity is not

guaranteed; oscillator has

stopped or has been

interrupted

6to4

SECONDS

0[1] to 5

ten’s place

actual seconds coded in BCD

format, see Table 20

3 to 0

0[1] to 9

unit place

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