PCF85263ATLSLASHAX datasheet(53/100 Pages) NXP

53 / 100 page

PCF85263A

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Product data sheet

Rev. 4.1 — 27 November 2015

53 of 100

NXP Semiconductors

PCF85263A

Tiny RTC with alarm, battery switch-over, and I2C-bus

The INTA pin can be used to output three different signals.

8.12.6.1

INTAPM[1:0]: INTA

The primary function of the INTA pin is to output INTA data. INTA data is controlled by the

bits of the INTA_enable register (see Table 29 on page 39).

The output is active LOW with an open-drain output. The output is available during VDD

and VBAT operation.

8.12.6.2

INTAPM[1:0]: clock data

It is possible to output a clock frequency on the INTA pin. Clock frequency is selected with

the COF[2:0] bits in the Function register (Section 8.13 on page 54). The output is active

LOW with an open-drain output. The output is available only during VDD operation. The

output is Hi-Z when operating from VBAT.

Remark: Clock output is the default state. To save power, it is recommended to disable

the clock when not being used. If no clock is required, then set COF[2:0] in the Function

CLK pin, then set the INTA pin to either INTA data or battery mode.

8.12.6.3

INTAPM[1:0]: battery mode indication

It is possible to output the state of the power switch on the INTA pin. The output has an

open-drain output. The output is available during VDD and VBAT operation.

Fig 29. INTA pin

Table 50.

INTA battery mode

Power supply

INTA pin state

VDD

INTA = Hi-Z

VBAT

INTA = logic 0

PCF85263ATL/AX Datasheet(PDF) 53 Page - NXP Semiconductors