PCF8564A datasheet(22/65 Pages) NXP

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PCF85063A

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Product data sheet

Rev. 7 — 30 March 2018

22 of 65

NXP Semiconductors

PCF85063A

Tiny Real-Time Clock/calendar with alarm function and I2C-bus

[1]

Default value.

8.3.1.1

OS: Oscillator stop

When the oscillator of the PCF85063A is stopped, the OS flag is set. The oscillator can be

stopped, for example, by connecting one of the oscillator pins OSCI or OSCO to 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 flag remains set until cleared by command (see Figure 13). If the flag 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.

Table 20.

Seconds coded in BCD format

Seconds value in

decimal

Upper-digit (ten’s place)

Digit (unit place)

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

00[1]

000

0000

000

0001

000

0010

:::

::::

000

1001

001

0000

:::

::::

101

1000

101

1001

Fig 13. OS flag

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