HC-21 (TLN13UA06) is a Department of Science and Technology
launched a new commitment of the third generation of embedded
UART-WiFi module products.
1: Operating voltage 3.3V ± 0.3 V.
2: The average power 420mw.
3: Operating Humidity 5% to 90% (non-condensing).
4: Operating temperature -55 °C ~ + 125 °C .
5: Dimensions 20mm * 37mm.
6: Interface Type Standard 3.3VTTL level, UART interface.
Module DC supply voltage 3.3V, standard serial interface signal
voltage TTL level.
Module maximum operating current of about 250mA, in the design of
the power supply circuit should be noted that the power consumption
to meet the module.
nRESET pin can be left unconnected, it is recommended that this pin
is connected to the MCU, so the module can be reset if necessary.
Note: Pin (8 to 5) for standard TTL level serial communications,
pins (4 to 1) as an optional feature pins.
Without the use of multi-purpose floating pins can not affect the
normal operation of the module.