ML7406 datasheet(76/104 Pages) ETC2

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FEDL7406-02

ML7406

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(7) 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.

ED value = 255 / 70 * (107 + input level[dBm])

However, if BPF setting modified and CCA is executed, ED value become bigger than normal case. CCA threshold can be

set as below , taking this compensation and variations into account.

CCA threshold = 255 / 70 * (107 + input level[dBm] - variations – other losses) + CCA compensation

Item

Value

Variation (individual, temp.)

6dB

Other loss

Antenna, matchich circuits loss

CCA compensation

12@100kbps, 15@200kbps, 0@other rate

Example) When input level threshold is set to -75dBm

conditions:other losses 1dB, 100kbps

CCAthreshold = 255 / 70 * (107 - 75 - 6 - 1) + 12

≈ 103

= 0x67

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,

ML7406 Datasheet(PDF) 76 Page - List of Unclassifed Manufacturers