PCF85263ATLSLASHA datasheet(46/92 Pages) NXP

46 / 92 page

NXP Semiconductors

PCF85263A

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

[2]

Default value.

Setting the CLKPM bit disables the CLK output and force the pin to drive out a logic

0. Clearing this bit enables the pad to output the selected clock frequency (see bits

COF[2:0] in the Function register, see Table 50).

7.12.2 TSPULL: TS pin pull-up resistor value

Bit

Symbol

Value

Description

TS pin pull-up resistor value

0 [1]

80 kΩ

TSPULL

40 kΩ

Table 44. TSPULL bit - Pin_IO control register (address 27h)

[1]

Default value.

Controls the pull-up resistor value used in the mechanical switch detector. For

applications where there is a large capacitance on the TS pin e.g. from a long connecting

cable to the mechanical switch, the pull-up resistor value can be halved to improve switch

detection.

Using the low-resistance value increases current consumption when the switch is closed

i.e. shorting to VSS.

7.12.3 TSL: TS pin level sense

Bit

Symbol

Value

Description

TS pin input sense

0 [1]

active HIGH

TSL

active LOW

Table 45. TSL bit - Pin_IO control register (address 27h)

[1]

Default value.

The active state of the TS pin can be defined for use as a timestamp trigger and/or as

stop control for the time counting. Active HIGH implies a transition from logic 0 to logic 1

is active. Active LOW implies a transition from logic 1 to logic 0 is active.

7.12.4 TSPM[1:0]: TS pin I/O control

Bit

Symbol

Value

Description

TS pin IO mode

00 [1]

disabled; input can be left floating

INTB output; push-pull

CLK output; push-pull

3 to 2

TSPM[1:0]

input mode

Table 46. TSPM[1:0] bits - Pin_IO control register (address 27h)

[1]

Default value.

PCF85263A

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Product data sheet

Rev. 5 — 1 February 2021

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