ML7396AB datasheet(51/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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IDLE detection for long period

When CCA IDLE detection is performed for longer time period, IDLE_WAIT[9:0]([IDLE_WAIT_L/H:B0 0x17/18(1-0)]

can be used. By setting IDLE_WAIT [9:0], averaging period longer than the period (for example, AD conversion16μs, 8

times average setting 128μs) can be possible.

This function can be used for IDLE determination – by counting times when average ED value becomes smaller than CCA

threshold defined by [CCA_LEVEL: B0 0x13] register. When counting exceed IDLE_WAIT [9:0], IDLE is determined. If

average ED value exceeds CCA threshold level, imemediately “Busy” is determined without wait for IDLE_WAIT [9:0]

period.

The following timing chart is IDLE detection setting IDLE_WAIT[9:0].

[ED value 8 timesv average IDLE detection case]

[Condition]

CCA normal mode

ADC_CK_SEL ([ADC_CLK_SET: B0 0x08(4)])=0b1 (2MHz)

ED_AVG[2:0] ([ED_CTRL: B0 0x1B(2-0)])=0b011 (ED value 8 times average)

IDLE_WAIT[9:0] ([IDLE_WAIT_L/H: B0 0x17/18(1-0)])=0b00_0000_0011 (IDLE detection period 48μs)

CCA_EN

[Note]

1. After issuing CCA command, transit into no-input state, and exit this state after filter stbilization.

2. When the iput level chnge from no-input to -80dBm, it takes around 32 μs for indicating -80dBm ED value.

ED value

(Internal signal)

CCA_RSLT[1:0]

[CCA_CNTRL: B0 0x15(1-0)]

CCA_DONE

[CCA_CNTRL: B0 0x15(2)]

[CCA_CNTRL: B0 0x15(4)]

ED_VALUE[7:0]

[ED_RSLT: B0 0x16]

ED value averaging period

(128μs)

0b10 (CCA on-going)

ED1

ED8

ED2

ED7

ED9

ED10

ED11

Filter stabilization

16 to 32 μs

AD conversion

(16μs)

IDLE detection period

(0-7)

0b00 (IDLE)

INVALID

averaging

CCA execution period (Max.32μs+128μs+48μs=208μs)

0x001

0x000

0x002 0x003

(48μs)

< CCA_TH_LV

B0 0x13

ED0

●●●

(1-8)

(2-9)

(3-10)

IDLE_WAIT[9:0]

[IDLE_WAIT_L/H:B0 0x17/18]

IDLE_WAIT start

(average ED value < CCA_TH_LV)

continue for AD conversion period

3 times (48μs), then IDLE is

determined.

ML7396AB Datasheet(PDF) 51 Page - LAPIS Semiconductor Co., Ltd.

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