TPS35-Q1: How to design an output Latching circuit using the TPS35AA38AGA?

Hi Jianhao,

There are ways to use discreet circuitry as well as a control GPIO to implement a latch on the output of the TPS35AA38AGADDFRQ1 device. Could you please share your schematic including the TPS35-Q1 device as well as any corresponding devices and connections that share any net with the TPS35-Q1, with this I can help to add the needed circuitry to provide a sample schematic that would include latch. 

Thanks,
Joshua

I would like the TPS35 to force the SEL of the analog switch TMUX1574 to 0 and switch to manual when the MCU can't reboot successfully

Thanks

Hi Jianhao,

Thanks for providing feedback. Joshua is out of office today but will review once he returns on Monday. A response will be provided on 8/12 by end of day.

Thanks,

Isa

Hi Jianhao,

Thank you for sharing your schematic. In order to latch the reset I would recommend you add a resistor between MR and RESET, that way whenever the RESET goes low MR will be pulled low and the device will be stuck low until a GPIO pulse is provided to MR to clear the latch. For this configuration during TPS35-Q1 startup you will need to provide a GPIO high pulse to the MR so that the device does not latch on startup. 

During TPS35-Q1 startup the RESET will go low, with this latch configuration you will need to provide a GPIO high pulse to the MR so that the device does not latch low on startup. 

Thanks,
Joshua