TPS65218D0: PMIC TPS65218D0

Sir,

we use TPS65218D0 for supplying power on board. The default power sequencing is LDO1(1.8V)->DCDC3(1.35V)->DCDC4(3.3V)->DCDC1(1.1V)->DCDC2(1.1V) based on register 0x25, 0x23, 0x22, which is same as our test result.

We actly want  power sequencing is DCDC4->LDO1->DCDC3->DCDC1->DCDC2(1.325V), we change the register value from I2C like this: Reg_0X23=0x37, Reg_0x25=0x65,Reg_0x17=0xAF. But it seems no effect.

we surely think the reg value was changed correctly. because we write the value to che Reg, then we read it from I2C, the value was what we have written.

then we test DCDC2 output, but it's still 1.1V.

and after re-power, we found the register value is still default value. Why? How can i change the default output and power sequencing?

for example, changing the DCDC2 output, we write the register like this:

write 0x6A to 0x10, where 0x6A is 0x17 xor with 0x7D

write 0xAF to 0x17

and the chipID register(0x0) is 0x5