PCF85263ATLSLASHA datasheet(15/102 Pages) NXP

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NXP Semiconductors

PCF85263A

Tiny RTC/Calendar with Alarm Function, Battery Switch-Over, Time Stamp Input, and I2C-bus

Upper-digit (ten’s place)

Digit (unit place)

Value in decimal

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Table 8. BCD coding

7.2.2 OS: Oscillator stop

When the oscillator of the PCF85263A is stopped, the OS status bit is set. The oscillator can be stopped, for

example, by connecting one of the oscillator pins OSCI or OSCO to the ground. The oscillator is considered to

be stopped during the time between power on and stable crystal resonance. This time can be in the range of

200 ms to 2 s depending on crystal type, temperature, and supply voltage.

The status bit remains set until cleared by command (for details, see Figure 10). If the bit cannot be cleared,

then the oscillator is not running. This method can be used to monitor the oscillator and to determine if the

supply voltage has reduced to the point where oscillation fails.

aaa-009576

OS = 1 and bit can not be cleared

VDD

oscillation

oscillation now stable

OS bit cleared

by software

OS bit set when

oscillation stops

OS flag

OS = 1 and bit can be cleared

Figure 10. OS status bit

7.2.3 EMON: event monitor

The EMON can be used to monitor the status of all the flags in the Flags register, see Section 7.14. When one

or more of the flags is set, then the EMON bit returns a logic 1. The EMON bit cannot be cleared. EMON returns

a logic 0 when all flags are cleared.

See Figure 23 for a pictorial representation.

7.2.4 Definition of weekdays

The definition can be reassigned by the user.

PCF85263A

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

Product data sheet

Rev. 5.4 — 12 December 2025

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