PCF85263ATLSLASHA datasheet(47/92 Pages) NXP

47 / 92 page

NXP Semiconductors

PCF85263A

Tiny Real-Time Clock/calendar with alarm function, battery switch-over, time stamp input, and I2C-bus

These bits control the operation of the TS pin.

sample

invert

mechanical

switch detector

vdd_int

80 kΩ/

40 kΩ

TS (CLK/INTB) pin (1)

sample clock

TSL

input data

INTB data

clock data

aaa-010443

1. Not available on all package types.

Figure 29. TS pin

TSIM is only considered when the TS pin is in input mode.

7.12.4.1 TS pin output mode; INTB

It is possible to output INTB data on the TS pin. The output is push-pull. No output is

available when on VBAT. When on VBAT the output is Hi-Z.

7.12.4.2 TS pin output mode; CLK

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

the COF[2:0] bits in the Function register (Section 7.13). The output is push-pull. No

output is available when on VBAT. When on VBAT the output is Hi-Z.

7.12.4.3 TS pin disabled

When disabled the pin is Hi-Z and can be left floating.

7.12.5 TSIM: TS pin input type control

Bit

Symbol

Value

Description

TS pin input mode

0 [1]

CMOS input; reference to VDD; disabled

when on VBAT

TSIM

mechanical switch mode; active pull-up

sampled at 16 Hz; operates on VDD and

VBAT

Table 47. TSIM bit - Pin_IO control register (address 27h)

[1]

Default value.

In CMOS input mode (TSIM = 0), input is taken directly from the TS pin. The input is

conditioned by the setting of TSL. When operating on the battery voltage (VBAT), the input

is disabled and is allowed to float.

PCF85263A

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

Product data sheet

Rev. 5 — 1 February 2021

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