Handling of unused pins of STWLC38

[Ryoma]

Hello,

I'm currently considering using STWLC38.

I have a question about connecting unused pins.

How should unused pins be handled?

(GPIO, SCL, SDA, INTB, VS, etc.)

Regards,

Ryoma

[willzhou]

Hi Ryoma

 for unused pins i suggest floating, SCL/SDA is used for MCU/AP control or external to updated fw. If SCL/SDA is not used, i strongly suggest you set SDA/SCL pin as test point in the pcb for future update fw. 

• STEVAL-WLC38RX SCHEMATIC

[Ryoma]

Hi willzhou,

Thank you for your prompt response.

I'll set SDA/SCL pin as test point as you suggested.

Let me check again.

May I also OPEN the VS pin?

Currently, only Rx mode will be used.

[willzhou · Accepted solution]

Vs pin can be open, you can refer to our small board

• DB4897Qi-1.3 compatible wireless power receiver reference design for 2.5W wearable applications
• TN1440STDES-WLC38WA wireless power receiver quick start guide and test report
• STDES-WLC38WA GERBER
• STDES-WLC38WA BOM
• STDES-WLC38WA SCHEMATIC
• DB4944Firmware for STDES-WLC38WA and STDES-WLC38TWS wireless charger receiver evaluation kit

[Ryoma]

Hi willzhou,

Thank you for your response.
I now understand how to handle unused pins.:smiling_face_with_smiling_eyes:

Regards,

Ryoma