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E42-400M20S Wireless module small size low power consumption 433/470MHz RF transceiver remote control module HW3000
[Introduction]：E42-400M20S is an SPI hardware module designed based on the original HW3000 RF chip of Shanghai Neusoft Carrier Microelectronics. It is half-duplex, integrates transceiver and receiver, transparent transmission mode, patch type, operating frequency band is 428~522MHz, and transmit power is 100mW. Suitable for a variety of environments, with high receiving sensitivity, strong anti-interference, and supports the development of low power consumption.
| Pin number | Pin name | Pin direction | Pin usage |
| 1 | GND | GND | Ground wire, connected to the power reference ground |
| 2 | GND | GND | Ground wire, connected to the power reference ground |
| 3 | GND | GND | Ground wire, connected to the power reference ground |
| 4 | GND | GND | Ground wire, connected to the power reference ground |
| 5 | GND | GND | Ground wire, connected to the power reference ground |
| 6 | GPIO2 | input /Output | General digital I/O (see HW3000 chip manual for function details) |
| 7 | GPIO3 | input /Output | General digital I/O (see HW3000 chip manual for function details) |
| 8 | GPIO1 | input /Output | General digital I/O (see HW3000 chip manual for function details) |
| 9 | VCC | VCC | Power supply, range 2.0V~3.6V (it is recommended to add external ceramic filter capacitors) |
| 10 | GND | GND | Ground wire, connected to the power reference ground |
| 11 | GND | GND | Ground wire, connected to the power reference ground |
| 12 | GND | GND | Ground wire, connected to the power reference ground |
| 13 | GPIO0 | input /Output | General digital I/O (see HW3000 chip manual for function details) |
| 14 | IRQ | output | Interrupt output pin (polarity configurable, default low level active) |
| 15 | PDN | input | POWER DOWN mode enable input pin (active high level) |
| 16 | MISO | output | SPI data output pin |
| 17 | MOSI | input | SPI data input pin |
| 18 | SCK | input | SPI clock input pin |
| 19 | CSN | input | SPI chip select signal (active low level) |
| 20 | GND | GND | Ground wire, connected to the power reference ground |
| 21 | ANT | — | Antenna connector, stamp hole (50 ohm characteristic impedance) |
| 22 | GND | GND | Ground wire, connected to the power reference ground |