TPS6521855: RSEL value when using register programming

HS WG-FAE

Part Number: TPS6521855
Other Parts Discussed in Thread: TPS65218D0

Hello,
how to set RSEL / DC34_SEL when using the default pre-programmed values or DCDC3/DCDC4 register programming? I read to connect DC34_SEL to GND but table 7-2 says 0Ohm is DCDC3=1.2V and DCDC4=3.3V.

Regards, Holger

over 2 years ago

0 Emily Kong1 over 2 years ago

TI__Expert 3350 points

Holger,

The RSEL values for the TPS65218xx series are based off of the TPS65218D0 settings. You can choose to connect DC34_SEL resistors for DCDC3 & 4, but if you connect DC34_SEL to GND, they will follow the I2C programmed voltage values. Hence, you can go ahead and GND DC34_SEL.

Best,
Emily

0 HS WG-FAE over 2 years ago in reply to Emily Kong1

TI__Mastermind 29625 points

Hello Emily,
thanks for quick answer. That is not clear from the datasheet. In the table RSEL=0Ohm means DCDC3=1.2V. You should add a comment that setting DC34_SEL to GND will use the pre-programmed values fro DCDC3/4.

Regards, Holger

0 Emily Kong1 over 2 years ago in reply to HS WG-FAE

TI__Expert 3350 points

Holger,

Thank you for the feedback. We'll take this into account for any future edit of this datasheet.

Best,
Emily

+1 HS WG-FAE over 2 years ago in reply to Emily Kong1

TI__Mastermind 29625 points

ok, thank. Please also correct the page 1 DCDC default voltage under features:

Power management

Power management forum

TPS6521855: RSEL value when using register programming