TRW データシートの表示（PDF） - Unspecified

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TRW

Wireless High Frequency Transceiver Module (RF GFSK)

Unspecified 

5.6 Direct Mode

In direct mode the nRF2401 works like a traditional RF device. Data must be at 1Mbps ±200ppm,

or 250kbps ±200ppm at low data rate setting, for the receiver to detect the signals.

5.6.1 Direct Mode Transmit

MCU interface pins: CE, DATA

1. When application MCU has data to send, set CE high

2. The nRF2401 RF front end is now immediately activated, and after 200 ms

settling time, data will modulate the carrier directly.

3. All RF protocol parts must hence be implemented in MCU firmware

(preamble, address and CRC).

5.6.2 Direct Mode Receive

MCU interface pins: CE, CLK1, and DATA

1. Once the nRF2401 is configured and powered up (CE high) in direct RX

mode, DATA will start to toggle due to noise present on the air.

2. CLK1 will also start to toggle as nRF2401 is trying to lock on to the incoming

data stream.

3. Once a valid preambl e arrives, CLK 1 and DA TA will lock on to the incoming

signal and the RF package will appear at the DA TA pin with the same speed

as it is transmitted.

4. To enable the demodulator to re-generate the clock, the preamble must be 8

bits toggling hi-low, starting with low if the first data bit is low.

5. In this mode no dat a ready (DR) signals is available. Address and checksum

verification must also be done in the receiving MCU.

5.6.3 DuoCeiver™ Simultaneous Two Channel Receive Mode

In direct mode, it can facilitate simultaneous reception of two parallel independent frequency channels

as ShockBurstTM mode. Please refer to section 5.5.4.

http://www.wenshing.com.tw ; http://www.rf.net.tw

TRW-24G Datasheet P.20

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