cc1101 and rssi values

hi~ 

I don't know if I help you.

but, I will give a hint what I know for cc1101.

first of all, I recommend you confirm the anttena performance of your product.

2nd, please control data rate, deviation, filter bandwidth. (ref. cc1101 datasheet)   

Check the ESD_Damage_RSSI.pdf document in following thread: http://e2e.ti.com/support/low_power_rf/f/155/p/187264/734641.aspx#734641 . Do the RSSI vs input power level and current vs input power level measurements. if you see similar behaviour your part has an ESD damage. Note that the input power level where there is a 20 dB drop in RSSI reading is different for AGCCTRL1 = 0x00 and AGCCTRL1 = 0x40.

Hi, I noticed similiar behaviour , but not ESD problem... in CC430

I have couple of rfSettings from 0,6kbps to 500kbps FSK, and AGC values for similiar data rate are taken from SmartRF examples and other registers AGC,FSCTRL1, FREND1, TEST2,1 .. are set according to RX BW  (DN022). I see that for different settings there are different  RSSI . This is strange because AGC must knows, what offset add to received signal and according that correct the RSSI value == for different data rates, rssi must be constant.

For example rfSettings4 ,average RSSI is -42 dBm. For rfSettings5, average is -38dBm. In rfSettings5, there is more changes than AGC, there is other values for TEST2/1, FSCTRL1, RX BW and so on. 

Q1:  What causes that RSSI values differ, AGC settings or it is a funcion of a complex register settings?

Thanks.

// 38.04 / 9.5 / 101 . M=0.5

// Sync word qualifier mode = 30/32 sync word bits detected
// CRC autoflush = false
// Channel spacing = 199.951172
// Data format = Normal mode
// Data rate = 38.0859
// RX filter BW = 101.562500
// PA ramping = false
// Preamble count = 4
// Whitening = true
// Address config = No address check
// Carrier frequency = 868.299866
// Device address = 0
// TX power = 0
// Manchester enable = false
// CRC enable = true
// Deviation = 9.521484
// Packet length mode = Fixed packet length mode. Length configured in PKTLEN register
// Packet length = 20
// Modulation format = 2-FSK
// Base frequency = 868.299866
// Modulated = true
// Channel number = 0
// Rf settings for CC430
RF_SETTINGS rfSettings4 = {
0x29, // IOCFG2 GDO2 Output Configuration
0x2E, // IOCFG1 GDO1 Output Configuration
0x06, // IOCFG0 GDO0 Output Configuration
0x00, // CHANNR Channel Number
0x21, // FREQ2 Frequency Control Word, High Byte
0x65, // FREQ1 Frequency Control Word, Middle Byte
0x6A, // FREQ0 Frequency Control Word, Low Byte
0xCA, // MDMCFG4 Modem Configuration
0x80, // MDMCFG3 Modem Configuration
0x83, // MDMCFG2 Modem Configuration
0x22, // MDMCFG1 Modem Configuration
0xF8, // MDMCFG0 Modem Configuration
0x24, // DEVIATN Modem Deviation Setting
0xE9, // FSCAL3 Frequency Synthesizer Calibration
0x2A, // FSCAL2 Frequency Synthesizer Calibration
0x00, // FSCAL1 Frequency Synthesizer Calibration
0x1F, // FSCAL0 Frequency Synthesizer Calibration

0x47, // FIFOTHR RX FIFO and TX FIFO Thresholds
0x06, // FSCTRL1 Frequency Synthesizer Control
0x00, // FSCTRL0 Frequency Synthesizer Control
0x16, // FOCCFG Frequency Offset Compensation Configuration
0x6C, // BSCFG Bit Synchronization Configuration
0x43, // AGCCTRL2 AGC Control
0x40, // AGCCTRL1 AGC Control
0x91, // AGCCTRL0 AGC Control
0x56, // FREND1 Front End RX Configuration
0x10, // FREND0 Front End TX Configuration
0x81, // TEST2 Various Test Settings
0x35, // TEST1 Various Test Settings
0x09, // TEST0 Various Test Settings

0x07, //MCSM2, default
0x30, //MCSM1, tu
0x10, //MCSM0, 
0xD3, //SYNC1
0x91, //SYNC0
0x44, // PKTCTRL1 Packet automation control. CRC append // PQT
0x44, // PKTCTRL0 Packet automation control. // Whitening PN9 +fixed mode
0x00, // ADDR Device address.
0x14, // PKTLEN Packet length. // 20 B
};

// 38.4 / 19.2  ..

// Sync word qualifier mode = 30/32 sync word bits detected
// CRC autoflush = false
// Channel spacing = 199.951172
// Data format = Normal mode
// Data rate = 38.3835
// RX filter BW = 116.071429
// PA ramping = false
// Preamble count = 4
// Whitening = true
// Address config = No address check
// Carrier frequency = 868.299866
// Device address = 0
// TX power = 0
// Manchester enable = false
// CRC enable = true
// Deviation = 19.042969
// Packet length mode = Fixed packet length mode. Length configured in PKTLEN register
// Packet length = 20
// Modulation format = 2-FSK
// Base frequency = 868.299866
// Modulated = true
// Channel number = 0
// Rf settings for CC430
RF_SETTINGS rfSettings5 = {
0x29, // IOCFG2 GDO2 Output Configuration
0x2E, // IOCFG1 GDO1 Output Configuration
0x06, // IOCFG0 GDO0 Output Configuration
0x00, // CHANNR Channel Number
0x21, // FREQ2 Frequency Control Word, High Byte
0x65, // FREQ1 Frequency Control Word, Middle Byte
0x6A, // FREQ0 Frequency Control Word, Low Byte
0xBA, // MDMCFG4 Modem Configuration
0x83, // MDMCFG3 Modem Configuration
0x03, // MDMCFG2 Modem Configuration
0x22, // MDMCFG1 Modem Configuration
0xF8, // MDMCFG0 Modem Configuration
0x34, // DEVIATN Modem Deviation Setting
0xE9, // FSCAL3 Frequency Synthesizer Calibration
0x2A, // FSCAL2 Frequency Synthesizer Calibration
0x00, // FSCAL1 Frequency Synthesizer Calibration
0x1F, // FSCAL0 Frequency Synthesizer Calibration

0x47, // FIFOTHR RX FIFO and TX FIFO Thresholds
0x09, // FSCTRL1 Frequency Synthesizer Control // moje 228 kHz IF filter
0x00, // FSCTRL0 Frequency Synthesizer Control
0x1D, // FOCCFG Frequency Offset Compensation Configuration
0x1C, // BSCFG Bit Synchronization Configuration
0xC7, // AGCCTRL2 AGC Control
0x00, // AGCCTRL1 AGC Control
0xB0, // AGCCTRL0 AGC Control
0xB6, // FREND1 Front End RX Configuration // RX > 101
0x10, // FREND0 Front End TX Configuration
0x81, // TEST2 Various Test Settings
0x35, // TEST1 Various Test Settings
0x09, // TEST0 Various Test Settings

0x07, //MCSM2, default
0x30, //MCSM1,
0x10, //MCSM0, 
0xD3, //SYNC1
0x91, //SYNC0
0x44, // PKTCTRL1 Packet automation control. CRC append // PQT
0x44, // PKTCTRL0 Packet automation control. // Whitening PN9 +fixed mode
0x00, // ADDR Device address.
0x14, // PKTLEN Packet length. // 20 B
};