PCF85063TP datasheet(8/46 Pages) NXP

Part #	PCF85063TP

Description	Tiny Real-Time Clock/calendar

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Manufacturer	NXP [NXP Semiconductors]

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PCF85063TP

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Product data sheet

Rev. 2 — 15 April 2013

8 of 46

NXP Semiconductors

PCF85063TP

Tiny Real-Time Clock/calendar

[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 5).

The first increment of the time circuits is between 0.507813 s and 0.507935 s after STOP

bit is released. The uncertainty is caused by the prescaler bits F0 and F1 not being reset

(see Table 7) and the unknown state of the 32 kHz clock.

Table 7.

First increment of time circuits after STOP bit release

Bit

Prescaler bits

[1]

1Hz tick

Time

Comment

STOP

F0F1-F2 to F14

hh:mm:ss

Clock is running normally

0

01-0 0001 1101 0100

12:45:12

prescaler counting normally

STOP bit is activated by user. F0F1 are not reset and values cannot be predicted externally

1

XX-0 0000 0000 0000

12:45:12

prescaler is reset; time circuits are frozen

New time is set by user

1

XX-0 0000 0000 0000

08:00:00

prescaler is reset; time circuits are frozen

STOP bit is released by user

0

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

08:00:02

0 to 1 transition of F14 increments the time circuits

DDD

V

WR

V

Fig 5.

STOP bit release timing

DDD

VWRV

+]

VWRSUHOHDVHG

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