PCF8564A datasheet(46/65 Pages) NXP

46 / 65 page

PCF85063A

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Product data sheet

Rev. 7 — 30 March 2018

46 of 65

NXP Semiconductors

PCF85063A

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

14. Application information

The data sheet values were obtained using a crystal with an ESR of 60 k

. If a crystal with

an ESR of 70 k

 is used then the power consumption would increase by a few nA and the

start-up time will increase slightly.

A 1 farad super capacitor combined with a low VF diode can be used as a standby or back-up

supply. With the RTC in its minimum power configuration that is, timer off and CLKOUT off, the

RTC may operate for weeks.

(1) R1 limits the inrush current to the super capacitor at power-on.

(2) NXP recommends tying VDD of the device and VDD of all the external pull-up resistors to the same

Power Supply.

(3) NXP also recommends the customer place accessible 'Pads/TP-test point' on the layout so as to

enable a 'hard'' grounding of the power supply VDD in the event a full discharge cannot be attained.

Fig 31. Application diagram for PCF85063A

PCF85063A

MASTER

TRANSMITTER/

RECEIVER

OSCI

OSCO

VSS

SDA

aaa-004438

SCL

SDA

(I2C-bus)

SCL

SDA

SCL

INT

VDD CLKOE

VDD(2)

R1(1)

100 nF

R: pull-up resistor

R =

CLKOUT

1 F

TP(3)

VDD(2)

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