您好,看起来是进入了ROM mode
It's possible for the enter "ROM mode" if the checksum stored doesn't match the checksum calculated after a reset. Do the following:
Send command 0x08 to execute FW
Check that the bq40z50-R1 FW is executing
Send command…
Part Number: TPA3123D2
原理图见上图。5,6脚输入,由语音合成芯片产生。电源是DC12V。右侧输出接8Ω/12W喇叭。
当刚上电时,电流一切正常,TPA3123芯片不发热。当播放过一次语音后,静态电流增大,功耗比刚上电时大了近1W左右。尝试过去掉输入,尝试过去掉输出端的E11和E12电容,尝试过改变C20/C25,C17/C22电容大小,都没有改变。用示波器测试21和22脚的输出,发现有差不多200KHz的左右的波形输出,幅值略小于12V(刚上电时,没有输出…