Back Drive from BT Chipset [CYW89820BWMLGES2]

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AkNa_4845671
Level 1
Level 1
5 questions asked 5 sign-ins First reply posted

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]

  1. Switch ON ( GPIO - high) : 3.2V [pin 1 & 2 of FB]
  2. Switch OFF ( GPIO - low) : 1.6V [pin 1 & 2 of FB]

Observation [when FB made DNP]

  1. Switch OFF  : 0 V [Ferrite bead pin 1]
  2. Switch On : 3.3V [Ferrite bead pin 1]
  3. All the time : 1.6V [Ferrite bead pin 2]

With Regards,

Akshay Naik

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1 Solution
SheetalJ
Moderator
Moderator
Moderator
First comment on KBA 750 replies posted 500 likes received

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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SheetalJ
Moderator
Moderator
Moderator
First comment on KBA 750 replies posted 500 likes received

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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