PCF85263ATLSLASHA datasheet(51/92 Pages) NXP

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NXP Semiconductors

PCF85263A

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

[1]

Default value.

The STOP register bit in the Oscillator register (Section 7.10) is used to stop the counting

of time in both RTC mode and stop-watch mode. Stopping of the oscillator can also

be controlled from the TS pin. The TS pin must first be configured as an input by the

TSPM[1:0] bits, then selected for active HIGH or active LOW by the TSL bits.

STOP bit [1] TSL

TS pin [2]

Oscillator state

Description

running

stopped

TS pin active HIGH

stopped

running

TS pin active LOW

stopped

TS pin ignored

Table 56. Oscillator stop control when STOPM = 1

[1]

In the Oscillator register (Section 7.10).

[2]

TSPM[1:0] = 11.

7.13.5 COF[2:0]: Clock output frequency

Frequency selection (Hz)

Bit

Symbol

Value

CLK pin

TS pin

INTA pin

000 [1]

32 768

001

16 384

010

8 192

011

4 096

100

2 048

101

1 024

110

2 to 0

COF[2:0]

111

static LOW

Hi-Z

Table 57. COF[2:0] bits - Function control register (address 28h)

[1]

Default value.

A programmable square wave is available at pin CLK. Operation is controlled by the

COF[2:0] bits. Frequencies of 32.768 kHz (default) down to 1 Hz can be generated for

use as a system clock, microcontroller clock, input to a charge pump, or for calibration of

the oscillator.

Pin CLK is a push-pull output and enabled at power-on. Pin CLK can be disabled by

setting CLKPM = 1 in the Pin_IO register (Section 7.12). When disabled, the CLK pin is

LOW.

The selected clock frequency may also be output on the TS pin and the INTA pin. The

CLKIV bit may be used to invert the clock output. CLKIV does not invert for the setting

COF[2:0] = 111.

The duty cycle of the selected clock is not controlled. However, due to the nature of the

clock generation, all clock frequencies except 32.768 kHz have a duty cycle of 50:50.

PCF85263A

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

Product data sheet

Rev. 5 — 1 February 2021

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