TPS65400: TPS65400 power sequencing without I2C

Hi Sonal,

Sorry, I don't quite understand what you mean. Do you mean to design a non-I2C solution, but also be compatible with the I2C solution? In other words, it can be used with or without I2C.Or just need a solution without I2C?

Best Regards,

Zhou

Hi Harry 

i need solution without I2C 

also need power sequencing 

Hi Sonal,

The first method is to use the default register value and realize power-on sequence control through ENx.
The second method is to reserve the I2C interface and implement register configuration through external I2C, which can be easily upgraded in the future.

Best Regards,

Zhou

Hi Harry 

Thanks for reply 

can i connect like following and expect  Vout1 -->Vout2 -->Vout3 -->Vout4

ENSW1 = Vin

ENSW2 = SS1/PG1

ENSW3 =SS2/PG2

ENSW4 =SS3/PG3

Hi Sonal,

1. Please note that the ABS of ENSWx is 4V. Therefore, Vin needs to be divided to give ENSWx. 

2.The SS/PGx pin has the SS function by default. It is not recommended to use the SS pin to control the power sequence. Because SS voltage rises very quickly, if SS1 controls ENSW2, the power supply sequence is not obvious. In addition, the SS pin has relatively high requirements during startup and should be avoided from being interfered with.
3.Here is a way to implement the power sequence by  Vout1 to control ENSW2, Vout2 to control ENSW3, and Vout3 to control ENSW4. This can be achieved with the help of transistor components.

Best Regards,

Zhou