STWLC38 schematics

[plawat]

We need the schematics to eb checked for 10W power output

[willzhou]

if external do not have pull up res, SCL/SDA/qi_nINT need pull up res to VDD.

[plawat]

https://www.st.com/resource/en/data_brief/stdes-wlc38tws.pdf 

Hi, we could communicate with the IC alright. However the charging is not happening although The wireless transmitter shows transmitting. In EVK the resistance is 100k.

Is insufficient power out may be due to this resistance?

[willzhou]

In EVK the resistance is 100k. It is for enb pull down.

About insufficient power out , can you get some waveform on VRECT/VOUT pin, so we can have more detail information.

[plawat]

Hi,

1. When the wireless charger is in place and the wireless charging coil is on top of it, the I2C is able to find the address of the IC, else it does not. Is that normal?

2. Please see the Chip info output and 

3. The register reading of mode monitor, when the coil is charging in the attached file.

Please guide us on what is to be fixed to get the desired charging.

regards

Vivek

[willzhou]

Hi
1.When the wireless charger is in place and the wireless charging coil is on top of it, RX is working, so i2c module is working. So it is normal.
2.From your info,
vrect = 0x0BE3 = 5732mV
vout = 0x0015 = 25mV
icur = 0x0021 = 41mA
tmeas = 0x013D = 47.5C

it seems vout do not get 5V output voltage.

[plawat · Accepted solution]

Hi,

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it seems vout do not get 5V output voltage.

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Understood.

What may be the reason for this. Any changes to be made in the register settings?

regards

Vivek