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KEY1 and KEY2 are used to connect the telegraph key. While using a
manual key it should connect to KEY1 and GND. To use an automatic key user
should connect KEY1, KEY2 and GND. The driving voltage for key is usually
1.8V.
LVCMOS pin is used to output control signals. The high signal level is 3.3V
with reference to GND.
This port does not support signal input, avoid inputting a high power
signal or it may be damaged.
2.2.6 AUDIO port
This port is used to connect an external speaker or a speaker mic. The
audio through this port is amplified. The max power at 4Ohm impedance can
reach 1.5W. Early products only connect the last section of the plug to audio
power amplifier output, while recent products have altered this design to
connect the last two sections, to provide a stereo output. For this reason, the
must pair it with a 4-section plug. DO NOT
user
the ground.
Pin definition:
short the second section to
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