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Hello,
We are seeing a back drive from the BT chipset [CYW89820BWMLGES2] at 3.3V power rail, When no power is connected to the chipset (series connected Ferrite bead made DNP to ensure no connection is provided from any source).
Our observations has been explained below and the Block diagram is attached for your reference:
Expected behaviour :
1) Power Switch ON : 3.3V [pin 1 & 2 of FB]
2) Power Switch OFF : 0V [pin 1 & 2 of FB]
Observation [when FB mounted]
- Switch ON ( GPIO - high) : 3.2V [pin 1 & 2 of FB]
- Switch OFF ( GPIO - low) : 1.6V [pin 1 & 2 of FB]
Observation [when FB made DNP]
- Switch OFF : 0 V [Ferrite bead pin 1]
- Switch On : 3.3V [Ferrite bead pin 1]
- All the time : 1.6V [Ferrite bead pin 2]
With Regards,
Akshay Naik
Solved! Go to Solution.
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Since CYW89820 is not a broad market chip, there is a limitation on supporting it in Community. So for more details and documentations, I would suggest you to contact your regional FAE or the Cypress Sales - https://www.cypress.com/about-us/sales-offices
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Since CYW89820 is not a broad market chip, there is a limitation on supporting it in Community. So for more details and documentations, I would suggest you to contact your regional FAE or the Cypress Sales - https://www.cypress.com/about-us/sales-offices