UCD9090A: UCD9090A / Unused pin connection

S.Satoshi

Guru 21675 points

Part Number: UCD9090A

Hi,

Please let me know the unused pin connection for following pins.

MONxx (Actually MON11 is unused)
GPIOxx
PWM1/GPI1, PWM2/GPI2

Best Regards,

Satoshi / Japan Disty

Best Regards,

Satoshi / Japan Disty

over 5 years ago

0 S.Satoshi over 5 years ago

Guru 21675 points

Hi,

Sorry for pushing when you are busy, but do you have any update?

Best Regards,
Satoshi

0 yihe over 5 years ago

TI__Guru 58090 points

we recommend to ground unused pins.

thanks

Yihe

0 S.Satoshi over 5 years ago in reply to yihe

Guru 21675 points

Hi Yihe,

The customer plan to unuse following pins, then I'd like to know default configuration of these pins, input or output. I need to know it because it should be input as default to ground.

# Pin name
------------------------------
37 MON11(I)
4 GPIO(I/O)
18 GPIO13(I/O)
21 GPIO14(I/O)
24 GPIO15(I/O)
25 GPIO16(I/O)
26 GPIO17(I/O)
22 PWM1/GPI1(PWM/I)
23 PWM2/GPI2(PWM/I)
27 TCK/GPIO18(I/O)
28 TDO/GPIO19(I/O)

Best Regards,
Satoshi / Japan Disty

0 S.Satoshi over 5 years ago in reply to S.Satoshi

Guru 21675 points

Hi Yihe,

Sorry for pushing whey you are busy, but your comment will be appreciated.

Best Regards,
Satoshi

0 Anne Ngo77 over 5 years ago in reply to S.Satoshi

TI__Expert 5470 points

The MON pin is output by default. All other GPIO pins are Input-Disable if unconfigured.

0 S.Satoshi over 5 years ago in reply to Anne Ngo77

Guru 21675 points

Hi Anne,

Regarding unused pin, Yihe recommends to tie to ground, so MON pin should pull down with resistor because MON pin is output by default. And regarding GPIO pin, the GPIO pin can be tie to ground directly because its output is input by default.
Is my understanding correct?

Best Regards,
Satoshi

0 Anne Ngo77 over 5 years ago in reply to S.Satoshi

TI__Expert 5470 points

Yes, it is correct.

Power management

Power management forum

UCD9090A: UCD9090A / Unused pin connection