Hi team,
1. Does TPS6590379ZWSR work without 16.384MHz or 32kHz clock when OSC16MIN is grounded?
2. Could you let me know the definition of the bypass mode of OSC16MIN in pin functions section in the datasheet?
To tell you the detail and background, my customer saw TPS6590379ZWSR outputting the voltage correctly when OSC16MIN is grounded.
However, from the datasheet 6.2.2.9, it looks like the device is not supposed to work without the external 16.384MHz clock.
> Please note that if the OSC16M_CFG OTP bit is set to 0, a 16-MHz crystal must be present for the proper operation of the device.
My customer found the similar question on E2E.
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1122692/tps659037-internal-oscillator-setting-osc16m_cfg/
> How can we enable 32kHz internal oscillator whereas OSC16M_CFG is R only?
The OSC16M_CFG bit is automatically set by the OTP configuration so there is no way to change it.
TPS6590379ZWSR is OTP 97 version.
OTP 97's OTP bits are described in the thread below.
My customer would like to make sure which one is correct, measurement or datasheet or E2E thread.
3.Instead of supplying clock to OSC16MIN and OSC16MOUT with the crystal, is it OK to input the clock from the oscillator operating with 1.8V which is same as VRTC?
The E2E thread below rejected 3.3V oscillator and recommended to use crystal.
https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/788699/tps659037-regarding-the-connection-of-the-oscillator-not-the-crystal
But 1.8V oscillator use case is not discussed, so my customer would like to check if it works.
Best regards,
Kazuki Itoh
