ML7344CE datasheet(89/154 Pages) LAPIS

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FEDL7344C/E/J-05

ML7344C/E/J

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●Antenna switching function

(1) Antenna switching function

By using [2DIV_CTRL: B0 0x48], [ANT_CTRL: B0 0x4C], [SPI/EXT_PA_CTRL: B0 0x53] registers,

TX-RX signal selection (TRX_SW), antenna switching signal (ANT_SW) can be controlled.

ML7344 can support both SPDT antena swith control. ANT_SW signal and TRX_SW signal output considion

for each antenna switch are explained below.

ANT_SW, TRX_SW output condition of each Idle, TX, RX state are as follow. (default setting) If

INV_TRX_SW([2DIV_CTRL: B0 0x48(2)])=0b1, polarity of TRX_SW is reversed.

INV_TRX_SW=0b0

(default setting)

INV_TRX_SW=0b1

(polarity reverse)

TX/RX

condition

ANT_SW

TRX_SW

ANT_SW

TRX_SW

Description

Idle

Idle state

TX state

RX state

In the above setting, If INV_ANT_SW([2DIV_CTRL: B0 0x48(3)])=0b1, ANT_CTRL1([2DIV_CTRL: B0

0x48(5)])=0b1 are set, polarity of ANT_SW pin is reversed.

INV_ANT_SW=0b0

ANT_CTRL1=any

(default setting)

INV_ANT_SW=0b1

ANT_CTRL1=0b1

TX/RX

state

ANT_SW

TRX_SW

ANT_SW

TRX_SW

Description

Idle

Idle state

TX state

RX state

(2) Antenna switch forced setting

By [ANT_CTRL: B0 0x4C] register, ANT_SW pin output conditions can be set to fix.

TX: By TX_ANT_EN([ANT_CTRL: B0 0x4C(0)])=0b1, TX_ANT([ANT_CTRL: B0 0x4C(1)]) condition

will be output.

RX: By RX_ANT_EN([ANT_CTRL: B0 0x4C(4)])=0b1, RX_ANT([ANT_CTRL: B0 0x4C(5)]) condition

will be output.

However, output is defined by [GPIIO*_CTRL: B0 0x4E - 0x51] register , [GPIIO*_CTRL:B0 0x4E - 0x51]

registers setting has higer priority.

ML7344CE Datasheet(PDF) 89 Page - LAPIS Semiconductor Co., Ltd.

ML7344CE Datasheet(HTML) 89 Page - LAPIS Semiconductor Co., Ltd.

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