ML7344J datasheet(81/151 Pages) ETC2

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Giải thích chi tiết về linh kiện	Sub-GHz band short range wireless transceiver IC

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FEDL7344C/E/J-04

ML7344C/E/J

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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]

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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