IN100-Q1-R-RC1F datasheet(28/49 Pages) ETC

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N1EDOC-DS-IN100-EN-V1.3

Shut Down mode: Both power domains are powered down. The leakage current at this mode is

less than 10nA.

4.10. Clock sources

There are four types of clock sources. They are: RC 32kHz, RTC 32.768kHz, RC 26MHz and XO

26MHz. RC 32kHz is the default clock source for the AON power domain.

The device’s clock system is designed to provide clocks to all subsystems that require clocks, and

to allow switching between different clock sources without degrading system performance or

power consumption.

The clock calibration uses the accurate 26MHz crystal to determine precisely the frequency of the

RC 32kHz. After the calibration, the device uses a division core to get the period and frequency of

the RC 32kHz. The division core will also be used for conversion between number of sleep cycles

and time slots, or other required time unit conversions.

4.10.1. RC 32kHz

The nominal value of this clock is 32kHz. The clock rate can vary from 16kHz to 48kHz and is

calibrated by the XO clock. The AON (Always-On) domain uses this as clock source.

Clock performance reported below was measured at the following condition: Ta = 25°C, VCC=3.0V,

unless otherwise noted.

Table 9 : 32kHz RC oscillator characteristics

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Oscillation

frequency

Default RC setting

22.5

kHz

Temperature

coefficient

Default RC setting

See

Figure 12

Hz/°C

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