3 Replies Latest reply on Feb 4, 2020 8:20 AM by IlBy_4632306

    PMU issue (CYW4343w)


      Hi, I use SP-KL1DX-T chip with  Cypress/CYW4343W IC.(linux 4.1.15). Firmware - cyw-bt-patch/CYW43430A1.1DX.hcd at master · murata-wireless/cyw-bt-patch · GitHub

      WLAN and Bluetooth work fine but I want to try PMU features.

      I read your datasheet(https://www.cypress.com/file/298081/download) page 27 and I decided to use BT_HOST_WAKE.

      Where I can find information about ' power management handshaking' ?

        • 1. Re: PMU issue (CYW4343w)

          Hi IlBy_4632306


          By power managment handshaking refers to the signalling between host and device to leverage the power management features provided by CYW4343W.

          Following is the Required Host Side Implementations.

           Configure interrupt source to be triggered by BT_HOST_WAKE.

           Activate low-power sleep mode on Host Controller by issuing 0xFC27(Vendor specific HCI command)

           Assert BT_DEV_WAKE before sending any HCI packets (commands or data) to UART.

           De-assert BT_DEV_WAKE if no more packets to be sent after a certain time.

           Before Host would like to enter sleep, suspend UART and hold flow-off by keeping Host’s UART_RTS pin de-asserted.

           When waked on BT_HOST_WAKE, resume UART and wait for UART fully functioning then assert Host’s UART_RTS pin to release flow-off.


          The table in

          (https://www.cypress.com/file/298081/download page 27 , gives further details of each signal.



          1 of 2 people found this helpful
          • 2. Re: PMU issue (CYW4343w)

            Check out the following link:

            Re: HOST_WAKE & BT_WAKE implementation

            1 of 2 people found this helpful
            • 3. Re: PMU issue (CYW4343w)

              Thanks, it exactly what I need! But I want to wake up my host device from BT module.

              I tried to send your hci command(Vendor specific):

              $ hcitool -i hci0 cmd 0x3F 0x0027


              < HCI Command: Vendor (0x3f|0x0027) plen 0                                           #1 [hci0] 3.034950

              > HCI Event: Command Complete (0x0e) plen 4                                          #2 [hci0] 3.035806

                    Vendor (0x3f|0x0027) ncmd 1

                      Status: Invalid HCI Command Parameters (0x12)


              Maybe I should use some params ?


              And what event will assert BT_HOST_WAKE from BT?