PCF85063ATLSLASH1 datasheet(8/55 Pages) NXP

8 / 55 page

NXP Semiconductors

PCF85063A

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

Bit

Prescaler bits

Time

STOP

F0F1-F2 to F14

[1]

1 Hz tick

hh:mm:ss

Comment

XX-0 0000 0000

0000

08:00:00

prescaler is now running

XX-1 0000 0000

0000

08:00:00

XX-0 1000 0000

0000

08:00:00

XX-1 1000 0000

0000

08:00:00

11-1 1111 1111

1110

08:00:00

00-0 0000 0000

0001

08:00:01

0 to 1 transition of F14 increments the time circuits

10-0 0000 0000

0001

08:00:01

11-1 1111 1111

1111

08:00:01

00-0 0000 0000

0000

08:00:01

10-0 0000 0000

0000

08:00:01

11-1 1111 1111

1110

08:00:01

00-0 0000 0000

0001

aaa-004416

1.000000 s

0.507813

0.507935 s

08:00:02

0 to 1 transition of F14 increments the time circuits

Table 6. First increment of time circuits after STOP bit release...continued

[1]

F0 is clocked at 32.768 kHz.

The lower two stages of the prescaler (F0 and F1) are not reset. And because the I2C-bus is asynchronous to

the crystal oscillator, the accuracy of restarting the time circuits is between zero and one 8.192 kHz cycle (see

Figure 7).

aaa-004417

0 µs to 122 µs

8192 Hz

stop released

Figure 7. STOP bit release timing

The first increment of the time circuits is between 0.507 813 s and 0.507 935 s after STOP bit is released. The

uncertainty is caused by the prescaler bits F0 and F1 not being reset (see Table 6) and the unknown state of the

32 kHz clock.

PCF85063A

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 7.1 — 8 November 2023

8 / 55

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