LK202-24-USB rev 1
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2. Connections
2.1 Connector Pinout
Refer to the diagram below for this chapter.
Figure 2-1 Electrical Connections
Connector Function
14 pin dual header
General purpose outputs (6) (see section 2.2) and +5V Output
Rx/Tx
Receive and Transmit LED outputs
10 pin header
Keypad (see section 2.6.12)
USB
Communication/power (see section 0)
Alt. USB
Alternate USB / power header
4 pin White header
Optional High power GPO power input
2.1.1 Power
USB High power ports can supply 500mA of power and low power devices (such as un-powered hubs) can
only supply 150mA of power. Please make sure you observe the total power usage on the LCD when
connected to the USB port. The LCD will require between 125mA to 200mA depending on the model and
the number of GPOs you are using.
GPO Maximum
Power
+5V Low Power
20mA
+5V High Power
750mA (PLEASE NOTE, an unmodified USB host
can only supply a maximum of 500mA on a high
power out put and only 150mA on low power.
+12V High Power
750mA
Power is applied via the USB cable or the alternate USB header. Power requirement is +5 VDC ±0.25V and
180mA minimum.
