EarthLCD ezLCD-405, Руководство пользователя

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e z L C D -­‐ 4 0 5 | 24
Rev.
© 2016 Earth Computers Tech. Inc.
The table below describes the pins and signals of the ezLCD-­‐405.
Pin Name Connector Type Description
+5V ext CN1 , CN5 External Power
External Power voltage. 5V/2A
Min = +4.75V
Max = +5.25V
GND pwr CN1 , CN5 GND
Power GND. Use as +5V ext return.
GND sig CN1 , CN6 GND
Signal GND. Use as a gnd for all interfaces
DM CN1 , CN6 I/O
USB Data Minus
DP CN1 , CN6 I/O
USB Data Plus
VBUS CN1 Power/input
USB VBUS +5V
+3.3V out CN1 Power/out
+3.3V/0.5A regulated voltage output. May
be used as a power supply for external
devices.
ON/OFF
CN1 input
ezLCD-­405 ON/OFF signal. The
same function as SW1 (ON) switch.
+3.6 to +7V turns ON the ezLCD-­405
power.
0 to +1V turns OFF the ezLCD-­405
power. Rin = 10 kOhm
PROG#
CN1 input
Firmware download signal. The same
function as SW2 (PROG) pushbutton.
The ezLCD-­405enters the firmware
bootloader state, if this pin is connected
to GND during the power up.
n/a CN1 I/O
I2C N/A interface
n/a CN1 I/O
I2C N/A interface
RS232 TTL TX
CN1 output
RS232 TTL Output
Min=0V
Max=+3.3V
RS232 TTL RX
CN1 input
RS232 TTL Input
Min = 0V
Max = +3.3V (+5V tolerant)
SS#
CN1 input
SPI interface SS signal
Min = 0V
Max = +3.3V ( Not +5V tolerant)
MISO
CN1 output
SPI Master Input Slave Output signal
Min = 0V
Max =
+3.3V
MOSI
CN1 input
SPI Master Output Slave Input signal
Min = 0V
Max = +3.3V ( Not +5V tolerant)
SPCK
CN1 input
SPI Clock Input
Min = 0V
Max = +3.3V ( Not +5V tolerant)