TC35679FSG-002

2018-01-17

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4.9. Sleep Clock Interface

TC35679 has the following features for sleep clock interface.



Crystal oscillator can be connected.



Clock frequency: 32.768 kHz (please adjust the frequency accuracy to < 500 ppm at the temperature in use)

Crystal oscillator is connected between SLPXOIN pin and SLPXOOUT pin. TC35679 doesn’t require external feedback resistors

and load capacitor because it has an internal feedback resistor and capacitor array between SLPXOIN pin and SLPXOOUT pin.

Please adjust capacitor array based on PCB layout and assembly if necessary within the range of the crystal’s specification.

When an external oscillator is connected, connect it to SLPXOIN and SLPXOOUT should be connected to the GND. When

oscillator is not used and do not supply a clock from the outside, these pins need to be connected to the GND.

4.9.1.

Crystal oscillator connection example

Figure 4-22 Crystal oscillator connection example

4.9.2.

External oscillator connection example

Figure 4-23 External oscillator connection example

External oscillator

Control

Trimming

Input

SLPXOIN

SLPXOOUT

TC35679

TC35679

SLPXOIN

SLPXOOUT

Control

Trimming

Input