BQ76PL455A: How bq76PL455 communicate to MCU?

Kami Huang60

Part Number: BQ76PL455A

Dear Sir/Ms.

The customer sample board was returned, and I wanted to connect to TI's software test, but I couldn't connect it.
Q1: When using the DEMO board, why is SW2 (1 is ON and 2 is OFF) connected to communicate with the computer (such as the accessory DSC_1178.JPG). SW2 (1 is OFF, 2 is ON) Can't connect (eg attachment DSC_1179.JPG)?

Q2: Is it necessary to put this circuit on our board, or choose one of the MODEs on our board to be able to operate normally? If there is no such line on the customer's board, what effect will it have?

Best Regards,

Kami Huang

over 6 years ago

0 Vish Nadarajah over 6 years ago

TI__Expert 6085 points

Hi Kami,
The 455A-Q commands 2 differential comm links to transmit signals between ICs in STACK configuration( not uses the UART). The base device thus translates the differential signal to single-ended. Having said, that communication with the 455A-Q1 from the HOST is commanded using the UART( single-ended) communication protocol. Detailed information is available in SLUSC51C document for reference.
So on the EVM, follow the silk screen ledger:- have the SWTICH flipped to "SINGLE " on the BASE device and on the STACK devices flip it to " DIFF" when using the GUI.

hope this helps.

0 Kami Huang60 over 6 years ago in reply to Vish Nadarajah

Genius 3830 points

Hello Vish,
I check with my customer they solve communication issue. Thanks for your kindly support.
Best Regards,
Kami Huang

0 Vish Nadarajah over 6 years ago in reply to Kami Huang60

TI__Expert 6085 points

thanks for the confirmation.

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BQ76PL455A: How bq76PL455 communicate to MCU?