TPS62860: How to set the SW back to 0V

Hello Pushpa,

thanks for reaching out in E2E and for your interest in our products.

The Vout discharge is done via the VOS pin by an internal MOSFET when the converter is disabled. The Output Discharge can be disabled with Bit 3 in the Control register, but it is enabled per default. This setting is then used for the next disable cycle (Software or Hardware).

Let me know if you have further questions.

Best regards,

Andreas.

so what value i should write to control register in order to dischage output to 0V

Hello Pushpa,

if the Control Register (0x03) is containing its default value (0x6B), then it should be sufficient to clear Bit 5 (Software Enable Device) by writing 0x4B. If the Control Register does not contain its default value, make sure that Bit 3 (Enable Output Discharge) is set. Then clear Bit 5 (Software Enable Device). The corresponding register value depends on the previous modifications.

Let me know if you have further questions.

Best regards,

Andreas.

I can see the out SW toggling. but what is the difference between EN and software enable bit 5?

if bit 5 of 0x03=1, SW =LOW

   bit 5 of 0x03=0, SW=HIGH

what about EN it is also device ON and off right so, if I set EN=0, then SW=0, and EN=1, then SW=1 ???

Hello Pushpa,

the EN pin and the Software Enable Device (bit 5 in Control Register 0x03) should be equivalent.

What do you mean by SW=1?

I would expect a rectangular waveform at the SW pin if the device is enabled.

Have you also observed Vout?

Here is a screenshot from our validation for reference.

Best regards,

Andreas.

What I observed is EN is default high. when this pin is set to 0 all the register settings will set back to default values. also I am facing lot of issue in writting python script for this. Am using a usb to i2c convertor which will drive the EN pin and I2C. but when i write code to i2c and gpio separately i can see the expected behavior but when I merge them together I am facing lot of issue.