HC-08 CC2540 4.0 Serial Module Low Power Long Distance

Core module size: 27 mm x 13 mm x 2 mm. TXD: serial port to send, 3.3 V TTL level. RXD: serial port receiving, 3.3 V TTL level. CTS: serial port flow control, of short duration does not support. RTS: serial port flow control, of short duration does not support. DC: simulation, burn the clock. DD: data simulation, burning feet. RST: module reset feet, low level of not less than 5 ms reset. VCC: module power supply, 3.3 V power supply, dc power supply current is not less than 100 ma. Working voltage range: 2.0 V to 3.6 V. GND: module in public. : LED module light output, high output, please concatenated resistance when connect the LED. Before connecting, Host not records from the machine address, per 100 ms bright; Host records from the machine address, per 900 ms bright; From the machine light 1 second every 2 seconds. After wiring, LED normally on. KEY: input, internal drop-down. The foot high level, are used to host clear records from the machine address. PIO: extend the functionality, master-slave mode for setting module, the default internal connected to pull resistance, for the machine; External take pull resistance 1 k to the ground, as the host.