AN2744 datasheet(51/56 Pages) STMICROELECTRONICS

51 / 56 page

AN2744

Troubleshooting

51/56

What to check

Check if JP2 and JP3 are closed. Please refer to Section 5.1 for receiving path

configuration.

Check if carrier frequency is present on RAI pin voltage with the oscilloscope

ground probe connected to the AVSS signal ground pin.

Check that programmed board channel (CH1/CH2) is matching the carrier

frequency selected through the control register panel of the reference design

software window.

Check preamble detection setting on the control register panel of the reference

design software window.

Check if data are present on RxD pin.

PROBLEM

: During a ping test or a transmission test, the ST7538Q reference design

board shows a high bit error rate.

Note:

This point refers to a half-duplex communication involving two ST7538Q reference design

boards communicating with each other.

What to check

Check that both reference design boards are programmed to transmit/receive on

the same carrier frequency.

Check on both reference design boards that programmed board channel

(CH1/CH2) is matching the carrier frequency selected through the control register

panel of the reference design software window.

Check preamble detection setting on the control register panel of the reference

design software window.

Check if data are present on RxD pin.

AN2744 Datasheet(PDF) 51 Page - STMicroelectronics