TUSB544: schematic check

GARETH OU

Mastermind 9995 points

Part Number: TUSB544
Other Parts Discussed in Thread: TPS65987, TVS2200

Could you help check the TUSB544 schematic and any need to adjust ,Thanks

TPS65987+TUSB544.pdf

over 1 year ago

0 David (ASIC) Liu over 1 year ago

TI__Guru**** 156321 points

Hi,

Please double check and make sure the ESD component ICMEF052P120MFR is appropriate. Otherwise TUSB544 portion of the schematic looks ok.

I will ask the PD team to check on the TPS65987.

Thanks

David

0 Christodulos Tsongas over 1 year ago in reply to David (ASIC) Liu

TI__Genius 10280 points

Hello,

I will give feedback by Friday. May I get some background on the application of this design?

Thanks,

Chris

0 Christodulos Tsongas over 1 year ago in reply to Christodulos Tsongas

TI__Genius 10280 points

C266 - Change to 4.7uF capacitor

C273/C274 - We recommend 10uF. Remove one of these

C267-C272 - We recommend 47uF (max 120uF) for Source, 10uF for Sink

VBUS1/VBUS2 - Add a TVS2200 or Schottkey diode close to pin

I2C1 SCL/SDA look to be pulled up to 1.8V via 1P8S and LDO_3V3. Please check. Should be pulled up to 3.3V from LDO_3V3

Ground GPIOs that are unused (GPIO16/GPIO17)

0 GARETH OU over 1 year ago in reply to Christodulos Tsongas

Mastermind 9995 points

The current usage of I2C is to reserve it for SOC. The level of SOC is 1.8V. Can I connect directly? It still has to be Pull-up to LDO_3V3 and then converted to 1.8V and connected to the SOC

0 Christodulos Tsongas over 1 year ago in reply to GARETH OU

TI__Genius 10280 points

GARETH OU said:
It still has to be Pull-up to LDO_3V3 and then converted to 1.8V and connected to the SOC

This would be recommended way to do it.

Another way to do this is to take the LDO_3V3 and use an LDO to convert to 1.8V. Then you can have the TPS65987 I2C lines connected to 1.8V pull-ups. This would also require a configuration change in the TPS65987 though.

The main goal is to always be sure the I2C lines coming from/to the PD are powered by LDO_3V3 to avoid any conditions where the PD cannot communicate to other devices.

Power management

Power management forum

TUSB544: schematic check