2-11
2.3.3 Keypad board
Serial port
communication
Key
Battery
indicator
AC LED
Red and
yellow alarm
lamp
Wi-Fi module
(Optional)
LCD
LCD backlight
control circuit
From the control
board
Block Diagram of Keypad Board
The keypad board is composed of a key processing module, an LED module, an
LCD display module and a Wi-Fi communication circuit module. The control signal
from the core control module is time-multiplexed for processing key information and
controlling display of LCD module after passing through two buffers
(SN74LVCR2245APWR).
U4 is a Wi-Fi module, which realizes external wireless communication after
connected to the main control CPU through UART.
The battery LED is always on during the charging process of the battery and flashes
when the power is supplied by the battery only. Its flashing frequency is controlled by
the power management CPU. The AC LED is always on when the AC power supply
is normal, and off when the AC power is disconnected.
Key test points:
TP50 VDD 3.3V
TP51 VDD 5.0V
TP32 LCD backlight power supply
TP53 Battery LED signal
TP52 AC LED signal
TP24 Output signal through Wi-Fi module serial port
TP25 Input signal through Wi-Fi module serial port
Содержание BeneFusion SP3
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