ML7396AB datasheet(36/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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●Energy Detection value (ED value) Function

ML7396 family supports calculating Energy detection value (here in after ED value) based on Received signal strength

indicator (RSSI). ED value acquisition can be enabled by ED_CALC_EN ([ED_CNTRL:B0 0x1B(7)])=0b1, and as soon as

transition to RX_ON state. And acquired ED value will be indicate at [ED_RSLT:B0 0x16] register. When ED_CALC_EN=1,

ED value will be updated constantly during RX_ON state. Even if ED_CALC_EN=1, While CCA operation or diversity search

operation, ED value will not be updated. After completion of CCA operation, diversity search, ED value will be updated.

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

ED_AVG[2:0] ([ED_CNTRL:B0 0x1B(2-0)]). During diversity operation, 2DIV_ED_AVG[2:0] ([2DIV_ED_AVG:B0

0x6D(2-0)]) is used for setting. After acquiring specified average ED value, ED_DONE [ED_CNTRL:B0 0x1B(4)] becomes

“0b1”, and [ED_RSLT:B0 0x16] register is updated.

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

Gain is switched.

Suspend ED value acquisition and then resume it.

Antenna is switched. (When diversity is enabled)

Timing from ED value starting point ot ED value acquisition is calculated as following formula.

ED value averaging time = AD conversion time (17.7μs/16μs) * number of average times

Note; AD conversion time can be set by ADC_CLK_SET ([ADC_CLK_SET:B0 0x08(4)])

Default value is 1.8MHz and SDC conversion time is 17.7μs

[Timechart]

[Condition]

Set ADC_CLK_SET([ADC_CLK_SET: B1 0x08(4)])=0b1 (2MHz)

Set ED_AVG[2:0] ([ED_CTRL: B0 0x1B(2-0)])=0b011 (8 times averaging)

ED value calculation

execution flag

RSSI value

(Internal signal)

AD conversion (17.8/16usec)

[ADC_CLK_SET:B0 0x08(4)]

ED_DONE

([ED_CNTRL:B0 0x1b(4)])

(Internal signal)

RSSI

ED_VALUE

[ED_RSLT:B0 0x16]

ED value averaging period (16μs*8=128μs)

ED_AVG[2:0] ([ED_CNTRL: B0 0x1B(2-0)])

2DIV_ED_AVG[2:0] ([2DIV_ED_AVG:B0 0x6D (2-0)])

Compensation

and averaging

INVALID

3-10

2-9

1-8

Constantly update by

moving averaging

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