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ML7344J Arkusz danych(PDF) 81 Page - List of Unclassifed Manufacturers

Numer części ML7344J
Szczegółowy opis  Sub-GHz band short range wireless transceiver IC
PDF  151 Pages
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Producent  ETC2 [List of Unclassifed Manufacturers]
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ML7344J Arkusz danych(HTML) 81 Page - List of Unclassifed Manufacturers

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(6) CCA threshold setting
CCA threshold value defined by [CCA_LVL: B0 0x37] register, should be considered desired input leve (ED
value), components variation, temperature fluctuation, loss at antenna and matching circuits. Input level and
ED value are described in the follow table.
RSSI value = 1.35 * (input level[dBm] – variations[dBm] – other losses[dBm]) + offset
ED value (CCA threshold) = (RSSI value + RSSI_ADJ) * RSSI_MAG_ADJ
Value
Item
High Sensitivity Mode
High Linearity Mode
offset
164.5
156
Variation (individual, temp.)[dBm]
10
7
Other loss[dBm]
Antenna, matching circuits loss
RSSI_ADJ
The setting of [RSSI_VAL:B1 0x14]
RSSI_MAG_ADJ
The setting of [RSSI_ADJ: B0 0x66]
Example) When input level threshold is set to -85dBm
conditions: High Linearity Mode, other loss = 1dB, RSSI_ADJ=0, RSSI_MAG_ADJ=4.5
RSSI value = 1.35 * (-85 - 7 – 1) + 156
= 30.45
CCA threshold = (30.45 + 0) * 4.5
= 137.025
~ 0x89
In order to validate whether CCA threshold is optimised or not, CCA should be executed and confirmimg
level changing from IDLE to BUSY, every time input level is changed,



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