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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LLCC68 데이터시트(PDF) 38 Page - Semtech Corporation |
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LLCC68 데이터시트(HTML) 38 Page - Semtech Corporation |
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38 / 111 page  LLCC68 Data Sheet Rev. 1.1 DS.LLCC68.W.APP Dec 2024 38 of 111 Semtech LLCC68 www.semtech.com The RSSI gain can be calibrated using the registers described in Table 6-4. By default, the chip is calibrated for the 868-915MHz band on the LLCC68 EVK. Gain Tune and Gain Offset values can be determined using an RF generator with the LLCC68 hardware implementation as follows: 1. Setup the device in GFSK mode and set the desired RF frequency. 2. Setup the device in manual gain mode (disable the AGC (Auto Gain Control)). 3. Use SetRssiCalibration API to set all tunes and offsets to 0. 4. Loop through all the different gains, including LNA boost mode (high power mode): a. Use the generator to emit a continuous tone at a specific output power gen_pwr (gain dependent), and account for all cable losses. A direct connection is recommended. b. Read the instantaneous RSSI (rssi_inst). c. Calculate the rssi_error = rssi_inst - gen_pwr. d. Log the rssi_error in a file. 5. Find the common offset between all errors, and use it as the new global offset. 6. Find the individual errors (relative to the new global offset) and use them as the tunes. 7. Write the RSSI Calibration register values, and go though the main loop again to check that the instantaneous RSSI is now calibrated. Table 6-4: Registers and Values Name Address Bits EVK 470-490MHz Band EVK 868-915MHz Band Data Data AgcRssiMeasCalH 0x89c 4:0 0x01 0x01 AgcRssiMeasCalL 0x89d 7:0 0x27 0x53 AgcGainTune_1_2 0x8f5 7:4 0xD 0x0 AgcGainTune_1_2 0x8f5 3:0 0xE 0x0 AgcGainTune_3_4 0x8f6 7:4 0xE 0x0 AgcGainTune_3_4 0x8f6 3:0 0x2 0x0 AgcGainTune_5_6 0x8f7 7:4 0x3 0x0 AgcGainTune_5_6 0x8f7 3:0 0x2 0x0 AgcGainTune_7_8 0x8f8 7:4 0x4 0x0 AgcGainTune_7_8 0x8f8 3:0 0x4 0x0 AgcGainTune_9_10 0x8f9 7:4 0x3 0x0 AgcGainTune_9_10 0x8f9 3:0 0x3 0x0 AgcGainTune_11_12 0x8fa 7:4 0x3 0x0 AgcGainTune_11_12 0x8fa 3:0 0x4 0x0 AgcGainTune_13 0x8fb 3:0 0x4 0x0 AgcGforstPowthr 0x8b9 7:0 0x4 0xA AgcSensiAdjust 0x8ac 7:2 0x22 0x25 |
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