Other Parts Discussed in Thread: TPS6521815
Customer uses TPS65216 now and find a problem.
Customer changed DCDC2 register to 0xA4. RD thinks he has written it successfully because the read back value and the output voltage are able to be changed.
What customer did is:
- Write Register SELW (0x1A) = 0xC6 (set Go bit)
- Write Register PASSWORD (0x10) = 0x17 ^ 0x7D, for writing DCDC2
- Write DCDC2 (0x17) = 0xA4
- Read DCDC2, check if it equals 0xA2
However, after power on reset, DCDC2 becames 0x99 again.
Do I need to write additional registers to enable EEPROM backup function?
Customer mentioned, there is no problem with chip revision 4. however this time they got revision 2.1 chip and find problem. Is there any difference could cause this problem?