PCF85263ATL/A View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

MFG CO.

PCF85263ATL/A

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

NXP Semiconductors. 

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NXP Semiconductors

PCF85263A

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

8.11 Battery switch register

This register configures the battery switch-over mode.

Associated with the battery switch-over is the battery switch flag (BSF) in the Flags

register (Section 8.14 on page 57). Whenever the IC switches to battery operation, the

flag is set. The flag can only be read when operating from VDD power, however an

interrupt pulse or static LOW signal can be generated whenever switching to battery. An

interrupt pulse can also be generated when switching back to VDD power. Examples are

given in Figure 24 and Figure 25.

When switched to battery, the VDD power domain is disabled. This means that I2C pins are

ignored, CLK output is disabled and Hi-Z, TS pin output mode is disabled and Hi-Z, TS

digital input is ignored and may be left floating. TS pin mechanical switch detector is

active. INTA output is still active for interrupt output and battery switch indication, but

disabled for clock output.

Table 36. IO pin behavior in battery mode

IO pin (mode)

SCL

VDD operation

active input

SDA

active input/output

CLK

active output

TS (output mode)

active output

TS (digital input)

active input

TS (mechanical switch input) active input

INTA

active output

VBAT operation

disabled; may be left floating

disabled; may be left floating

disabled; Hi-Z

disabled; Hi-Z

disabled; may be left floating

active input

active interrupt output

Table 37.

Bit

Symbol

Section

Battery_switch - battery switch control (address 26h) bit description

7

6

5

4

3

2

1

-

-

-

BSOFF

BSRR

BSM[1:0]

-

-

-

Section 8.11.1 Section 8.11.2

Section 8.11.3

0

BSTH

Section 8.11.4

8.11.1 BSOFF: battery switch on/off control

Table 38. BSOFF bit - battery switch control (address 26h) bit description

Bit

Symbol

Value

Description

4

BSOFF

battery switch on/off

0[1]

enable battery switch feature

1

disable battery switch feature

[1] Default value.

The battery switch circuit may be disabled when not used. This disables all the circuit and

save power consumption. When disabled connect VBAT and VDD together.

PCF85263A

Product data sheet

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

Rev. 4.1 — 27 November 2015

© NXP Semiconductors N.V. 2015. All rights reserved.

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