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When looking at the publicly available TM4C123x this makes totally sense. http://embedded-lab.com/blog/tiva-c-clock-system/ The TM4C123 contains a Precision Internal Oscillator (PIOSC) so yeah... 32khz is for MCU hibernation and the external for some pheriperals inside the MCU. Going to look...

I just checked with a 3476 board (with a magsafe2) that the 24mhz clock starts after power is applied to PPDCIN_G3H. So the 24MHz crystal is not interesting anymore. Amazingly so isn't the 32KHz clock. What I did: - Probe 1 (yellow) on SMC_CLK32K - Probe 2 on SYS_ONEWIRE SMC_CLK32K starts...

Checked all traces around y1900, resistors and caps. All seems fine. u1900 generates the 32khz from itself somehow. The 24mhz clock is started when enabled through one of the VIOE lines (and probably SMC_CLK12M_EN) I think. Measured both CD3215 chips: - PP20V_USBC_XA_VBUS = .345 -...

Well I've checked with a working 820-3476 to check some clock signals. SMC doesn't need the 32khz clock for the green light so probably also not for the 20v line. SMC however does need the 12mhz clock. Not sure if needed but S5_PWRGD is NOT present. This is because PP3V3_S5 is only about 1.2v...

Sorry made a little mistake in the post: -PPDCIN_G3H = 5.2v -PP20V_USBC_XA_VBUS = 5.2v I do not have oscillation at Y1900. However, I do have a nice SYSCLK_CLK32K_PCH going to the PCH. I do not have SMC_CLK32K from the PCH to the SMC...

Anyone? I've reflowed the SMC but no difference. SMC_CLK12M_EN isn't going high so the SMC won't get a clock signal. I do not know what the requirements are for the SMC to enable SMC_CLK12M_EN. SMC_RESET_L is high.

Hi all, I'm repairing a water damage 820-00840 here. Visible liquid damage is around u3900, u8400 and u7650. Has been cleaned. So situation is as follow: -PPDCIN_G3H = 5.2v -PP3V3_G3H = 3.4v Started by replacing both CD3215 (might not have been needed after all): - PP20V_USBC_XA_VBUS = 3.4v -...