This note provides a technique for minimising the current consumption when using a crystal oscillator at 32 kHz with ST62 microcontroller.
The document provides a technique for minimizing power usage in applications utilizing a 32 kHz crystal oscillator for the ST62 microcontroller. It details how adding a specific resistor value to the standard oscillator circuit limits power dissipation through the crystal, thereby lowering the load on the internal inverter circuit.
The recommended resistor value is 330K.
The start-up time increases to a range of 300 to 500 ms.
The typical current saving reduces consumption from 900 uA to 450 uA.