What is "LSE drive"?

[Lars Beiderbecke]

I'm trying to figure out the battery consumption of an STM32F746. Accodring to the datasheet, that depends on SRAM state, RCC state, and if the LSE is in low, medium low, medium high, or high drive.

I have no idea what these kinds of drives are, nor did I find them in the reference. How can I configure the "drive", and what is the default?

[waclawek.jan · Accepted solution]

> What is "LSE drive"?

Gain of amplifier of the LSE oscillator.

Read RCC_BDCR description in RM. Read AN2867.

JW

[Lars Beiderbecke]

Will do, thanks Jan!

[Lars Beiderbecke]

I'm using an ASFL1 by Abacron. According to the application note, one critical parameter of the oscillator is the oscillator transconductance (unit: mA/V). However, my datasheet doesn't list this value (probably none of Abacron's datasheets are).

How can I find the transconductance values?

[Lars Beiderbecke]

BTW, are there any disadvantages of using an oscillator for LSE? That would save me all that monkeying around, no?