ML7344J datasheet(70/151 Pages) ETC2

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FEDL7344C/E/J-04

ML7344C/E/J

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●RX Related Function

●AFC function

ML7344 supports AFC function. Master clock Frequency accuracy (max. ±10ppm) between transmitter and

receiver can be compensated by this function. Using this function, stable RX sensitivity and interference

blocking performance can be achieved. This function can be enabled by setting AFC_EN([AFC/GC_CTRL:

B1 0x15(7)])=0b1. AFC range is defined by AFC_LIM_OFF ([DEMOD_SET0:B1 0x56(2)]. When setting

0b0 (limit ON), AFC range is ±9ppm. When setting 0b1 (limit OFF), ±10ppm AFC range is avilable.

●Energy detection value (ED value) acquisition function

ML7344 supports calculating Energy detection value (ED value) based on Received signal strength indicator

(RSSI). ED value acquisition can be enabled by setting ED_CALC_EN ([ED_CTRL: B0 0x41(7)])=0b1 and as

soon as transition to RX_ON state, automatically start acquiring ED value. During RX_ON state, ED value

constantly updated.

ED value is not RSSI value at given timing, but average values. Number of average times can be specified by

ED_AVG[2:0] ([ED_CTRL: B0 0x41(2-0)]). After acquiring specified average ED value, ED_DONE

([ED_CTRL: B0 0x41(4)]) becomes ”0b1” and ED_VALUE[7:0] ([ED_RSLT: B0 0x3A]) is updated.

ED_DONE bit will be cleared if one of the following conditions are met.

1. Gain is switched..

2. Once stopping ED value acquisition and then resume it

Timing from ED value starting point to ED value acquisition is calculated as below formula.

ED value average time = AD conversion time (18.5μs/14.7μs) * (Number of average times + 8(Deley)).

NOTE: AD conversion time can be slected by ADC_CLK_SEL([ADC_CLK_SET: B1 0x08(4)]).

Reset value is 1.73MHz and AD conversion time is 18.5μs.

Digital filter delay is “AD conversion time * 8”.

The timing example is as follows:

Set ADC_CLK_SEL ([ADC_CLK_SET: B1 0x08(4)]) =0b1. (1.73 MHz)

Set ED_AVG[2:0] ([ED_CTRL: B0 0x41(2-0)])=0b011. (8 times averaging)

RSSI value

(internal signal)

AD conversion (18.5μs)

ED_DONE

([ED_CTRL:B0 0x41(4)])

ED value calculation

execution flag

(internal signal)

ED_VALUE[7:0]

[ED_RSLT: B0 0x3A]

ED value averaging period (18.5μs*(8+8)=296μs)

RSSI

1-8

INVALID

Compensation and averaging

2-9

Constantly update

by moving average

3-10

RSSI

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