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CMOSTEK CMT2219B User Manual

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AN166
AN166
CMT2219B RSSI User Guide
Overview
This document discusses RSSI related registers and their usage as well as the calibration methods of the CMT2219B.
The product models covered in this document are shown in the below table.
Table 1. Product Models Covered in the Document
Product Model
Frequency Range
Modulation Type
Main Function
Configuration Mode
Packaging
QFN16
CMT2219B
127 - 1020 MHz
(G)FSK/OOK
Receiver
Register
Before reading this document, it is recommended to read the AN161-CMT2219B Quick Start Guide to understand the
basic information of the CMT2219B.
Rev0.7 | 1/8
www.cmostek.com
Copyright © By CMOSTEK

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Summary of Contents for CMOSTEK CMT2219B

  • Page 1 CMT2219B RSSI User Guide Overview This document discusses RSSI related registers and their usage as well as the calibration methods of the CMT2219B. The product models covered in this document are shown in the below table. Table 1. Product Models Covered in the Document...

  • Page 2: Table Of Contents

    1.2 RSSI Measurement and Comparison in FSK mode ................... 4 1.3 RSSI Measurement and Comparison in OOK Mode ..................5 1.4 RSSI Measurement Result Compensation ......................6 2 Revise History ........................... 7 3 Contacts ............................. 8 Rev0.7 | 2/8 www.cmostek.com...

  • Page 3: Rssi Measurement And Comparison

    The sign bit of the error compensation value for RSSI_OFFSET_SIGN RSSI measurement. CUS_RSSI (0x0B) Error compensation value RSSI RSSI_OFFSET<4:0> measurement. RSSI measurement time. 0: measure continuously CUS_SYS11 (0x16) RSSI_DET_SEL<1:0> 1: measure when PREAM_OK is active 2: measure when SYNC_OK is active Rev0.7 | 3/8 www.cmostek.com...

  • Page 4: Rssi Measurement And Comparison In Fsk Mode

    RSSI_AVG_MODE<2:0> by users. After the smoothing filtering, the code value is converted to a value in dBm. At last, the values before and after the unit conversion are sent to the register for conditional latching with the latch condition configured by setting Rev0.7 | 4/8 www.cmostek.com...

  • Page 5: Rssi Measurement And Comparison In Ook Mode

    SYNC_OK or PKT_OK, it needs to ensure the number of symbols received before the two interrupts occurring is greater than the filtering order. To accommodate different using habits of users, the CMT2219B provides both RSSI values in dBm and simple 8-bit code values. RSSI values in dBm is recommended in general.

  • Page 6: Rssi Measurement Result Compensation

    0, When RSSI_CODE<7:0> - 91 < 0 After calibration, the RSSI measurement value is increasing monotonically from -128 dBm to 20 dBm. It shows fine linearity from -100 to -50 dBm, reaching an accuracy of ± 3dB. Rev0.7 | 6/8 www.cmostek.com...

  • Page 7: Revise History

    AN166 2 Revise History Table 2. Revise History Records Version No. Chapter Description Date Initial version 2018-10-10 Rev0.7 | 7/8 www.cmostek.com...

  • Page 8: Contacts

    The material contained herein is the exclusive property of CMOSTEK and shall not be distributed, reproduced, or disclosed in whole or in part without prior written permission of CMOSTEK. CMOSTEK products are not authorized for use as critical components in life support devices or systems without express written approval of CMOSTEK.

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