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CC2564C: CC2564C oscillate

Lin Fiske
Intellectual 690 points

Part Number: CC2564C

I am measuring the RF performance of my BLE module using CC2564C. When I execute below command for Tx test. The CC2564C seems has RF stability problem. It seems oscillate 


Send_HCI_VS_LE_Enable 0xFD5B, 0x01, 0x01
Wait_HCI_Command_Complete_VS_LE_Enable_Event 5000, 0x00, 0xfd5b, 0x00
Send_HCI_VS_LE_Output_Power 0xFDDD, 0x01
Wait_HCI_Command_Complete_VS_LE_Output_Power_Event 5000, 0x00, 0xfddd, 0x00
Send_HCI_BLE_Transmitter_Test 0x00, 0x25, 0x00
Wait_HCI_Command_Complete_BLE_Transmitter_Test_Event 5000, 0x00, 0x201e, 0x00
when I set the power level index to 0x03 instead of ox01 as below, the  CC2564C has no stability problem. Please tell me the reasons. Is it related to antenna matching?
Send_HCI_VS_LE_Output_Power 0xFDDD, 0x03
Wait_HCI_Command_Complete_VS_LE_Output_Power_Event 5000, 0x00, 0xfddd, 0x00