Bluetooth®︎

Bluetooth forum

State
Locked Locked
Replies 4 replies
Subscribers 51 subscribers
Views 176 views
Users 0 members are here

Support feedback

Options

Options

Similar topics

CC2640R2F-Q1: DIO voltage is 1.7V when VDDS=0

Albin Zhang

Expert 5450 points

Part Number: CC2640R2F-Q1

Hi, There,

On one of my customer's design, there is 1.7V on the DIO when shut down the VCC. noticed customer, the DIO voltage can't be higher than VDDS +0.3V as description in the datasheet.

there is some functionality problem, e.g. can't bootup normally.

Customer would like to know what the possible reason is and what the risk if they keep current design. hope to get some analysis based on Chip design architecture.

BR. Albin

over 2 years ago

0 FI over 2 years ago

TI__Mastermind 20210 points

Hi,

How exactly is the device connected to power? Are they sensing some external voltage on a DIO?

Thanks

0 Albin Zhang over 2 years ago in reply to FI

TI__Expert 5450 points

Hi FI,

Customer have a upper processor. the 1.7V is from the pin of the IO. they also proble 1.2V on the VCC_BLE while the "Vcc_BLE switch" is cut off.

0 FI over 2 years ago in reply to Albin Zhang

TI__Mastermind 20210 points

Hi,

If the pin is in tri-state condition and connected to a node with different potential there might be a small leakage current going through the pin.

see section 11.6 of www.ti.com/.../swcu117

regards

0 Albin Zhang over 2 years ago in reply to FI

TI__Expert 5450 points

HI, the "tri-state" should be "powered" correctly, right?

the question is about "no power" usage.

customer cut the VDD, and there is voltage on DIO.

they question is that, why the chip can't be boot up, and what's the risks.

BR. Albin