TPS65950 not generating VMMC1

Bhupesh

Other Parts Discussed in Thread: TPS65950, DM3730

Hi,

I have our custom board with DM3730 & TPS65950, i am not getting VMMC1 voltage on TPS65950 device.

I have checked the power up sequnce and all the voltages like VIO,VPLL1, VDD1, VDD2 are coming up correctly. It seems DM3730 is not sending I2C command to TPS device to switch on the VMMC1 volatage.

I have checked all the power up sequnces and they are correct. All the clock inputs to TPS65950 is correct

I can JTAG to DM3730 using blackhawk usb100v2 debugger, is there any register in DM3730 which can tell why it is not sending I2C command ?

Thanks,

Bhupesh

over 14 years ago

0 Gandhar Dighe over 14 years ago

TI__Genius 15100 points

Easiest way is to check where this I2C write is. If it is after power up then I would expect that this command to be executed. It may be so that the command is executed only when it detects a MMC card. I dont know the software details.

0 Bhupesh over 14 years ago in reply to Gandhar Dighe

Prodigy 70 points

i will try to check where that i2c write is in boot code, i don't think i2c command is executed only when it detecs MMC becasue on beagle board xm i have probed the i2c signals and DM37xx send i2c command when there is no sd card inserted.

thanks

Power management

Power management forum

TPS65950 not generating VMMC1