How to calibrate crystal trimHow to calibrate crystal trimFAE SH Sallen.dong Dec 20st, 2006Purpose In RF test procedure, we often meet with carrier frequency drift fail. To calibrate crystal trim , we can resolve this issue usually.Need to tools Bluesuit 1.Bluetest.exe 2.btcli.exe 频谱分析仪 MT8852B or CMU200Step 11.断开BT chip 与Host的连接 2.从TX ,RX 把UART接到PC的口。（需要用到RS232－TTL3V 电平转接 板）Step 2 Open btcli.exe1.Select protocol :bcsp 2.Select com port:com1 3.Select baud rate:115200 4.Click OK 5.Set crystal :psset 0x01fe 0x6590(26M)/0x3e80(16M) 6.Set crystal trim:psset 0x01f6 0x001d(default) see next page. 7.Bcset warm_reset (exit btcli)BtcliOpen bluetest1.Select protocal:bcsp 2.Select port:com1 3.Baud rate :115200 4.Click “OK”BluetestTxstart1.Select Txstrart 2.Click “execute”Spectrum analys……