ML7344CE datasheet(54/154 Pages) LAPIS

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(2)In case of using SDI/SDO pins (sharing with SPI interface)

If SDI and SDO pins are used as DCLK/DIO, DCLK/DIO should be controlled as follow. (below DIO/DCLK

vertical line part indicate output or input period) Both SDO_CFG and SDI_CFG ([SDI/EXT_PA_CTRL:B0

0x53(5,4)]) should be set 0b1

[TX]

i) Continuous input mode (from host)

Set TXDIO_CTRL[1:0] ([DIO_SET: B0 0x0C(5-4)]) =0b01.

After TX_ON(SET_TRX[3:0] ([RF_STATUS: B0 0x0B(3-0)])=0x9), during SCEN pin is “H”, DCLK is

output from SDO pin., TX data can be input from DIO pin at falling edge of DCLK. TX data must be encoded

data. After TRX_OFF is issued (SET_TRX[3:0] ([RF_STATUS: B0 0x0B(3-0)])=0x8), DCLK output will

stop. During DCLK output, if SCEN pin becomes “L”, DCLK output will stop. (SPI access has priority)

NOTE:

Not to access SPI until TX completion. During packet transmission, if SPI access is attempted by the host, TX

data error can be expected.

ii) Data input mode (from host)

Set TXDIO_CTRL[1:0] ([DIO_SET: B0 0x0C(5-4)])=0b10.

After TX_ON, when SCEN is ”H”, DCLK is output from SDO pin during data input period after SyncWord.

At falling edge of DCLK, TX data should be input to SDI from the host. After TRX_OFF is issued

(SET_TRX[3:0] ([RF_STATUS: B0 0x0B(3-0)])=0x8), DCLK output will stop. During DCLK output period,

if SCEN becomes “L”, DCLK output will stop. (SPI access has a priority)

TX_ON

command

TRX_OFF

command

DIO(SDI)

TXON

TX data

DCLK(SDO)

Preamble

SyncWord

Data-field

SCEN

TX_ON

command

TRX_OFF

command

DIO(SDI)

TXON

TX data

DCLK(SDO)

Preamble

SyncWord

Data-field

SCEN

ML7344CE Datasheet(PDF) 54 Page - LAPIS Semiconductor Co., Ltd.

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