ML7396AB datasheet(113/140 Pages) LAPIS

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FEDL7396A/B/E-07

ML7396A/B/E

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●2 diversity operation

After setting 2DIV_EN ([2DIV_CNTRL: B0 0x71(0)])=0b1, issuing RX_ON by [RF_STATUS:B0 0x6C] register. Antennas

are switched to acquire each ED value, the antenna with higher ED value will be automatically selected.

ML7396 supports recovering function from incorrect diversity completion caused by errornous detection due to thermal noize,

After dicersity search completion, if preamble can not be detected until antenna search timer expiration, ML7396 judges the

previous diversity search completion is incorrect and resume diversity operation automatically.

When resume diversity operation for next packet receiving, please clear RX completion interrupt (INT[18]/[19] group3) and

Diversity search completion interrupt (INT[09] group2). For details, please refer to “Diversity function”.

ED values ([ANT1_ED:B0 0x73], [ANT2_ED:B0 0x74] registers) from diversityantennas and the diversity result

([2DIV_RSLT:B0 0x72(1-0)]) will be cleard when clearing Diversity search completion interrpy, clearing RX completion or

Diversity resume by errornous detection. ED values and diversity result should be read before clearing RX completion

interrupt.

START

Set 2DIV_EN=0b1

[2DIV_CNTRL:B0 0x71(0)]

Masking INT[09]

[INT EN GRP2:B0 0x2B ]

* If set 2DIV_EN=0b1 after issuing RX_ON, diversity

will be executed after search timer completion defined

by [2DIV_SEARCH:B0 0x6F] register.

RX_ON issue

If SFD is detected while seatch timer counting,

diversity will not be executed and keep receiving.

[RF_STATUS:B0 0x6C]

RX completion (INT[18]/[19])?

[INT_SOURCE_GRP3:B0 0x26]

Yes

Read diversity result

[2DIV_RSLT:B0 0x72(1-0)]

[ANT1_ED:B0 0x73]

[ANT2_ED:B0 0x74]

Clear INT[18] or [19]

[INT_SOURCE_GRP3:B0 0x26]

Clear INT[09]

[INT_SOURCE_GRP2:B0 0x25]

Yes

* Diversity search completion interrupt (INT[09]

group2) should be cleard at same timing of RX

completion interrupt clearance.

Next packet RX?

TRX_OFF issue

[RF_STATUS:B0 0x6C]

END

ML7396AB Datasheet(PDF) 113 Page - LAPIS Semiconductor Co., Ltd.

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