Operation; Block Diagram - Toshiba e-STUDIO167 Service Manual

5.4

Operation

5.4.1

Block diagram

The control panel which mainly consists of the panel controlling ASIC and LED driver transmits/
receives the control signal to/from the SoC on the MAIN board, controls the LCD, detects the key
pressed, and controls the ON/OFF of the LED and buzzer.
The LCD is controlled by the signal output from the panel controlling ASIC based on the information
output from the SoC via the control panel data bus (OD0 to 7).
The input status of each button is output to the SoC via the data bus (OD0 to 7) by the panel controlling
ASIC and detected.
Each LED is controlled to be lit by the LED driver based on the information of the serial data (OPLDSO)
output from the SoC.
The buzzer is controlled by the buzzer ON signal (BZON) output from the ASIC on the MAIN board.
MAIN board
SoC
ASIC
© February 2007 TOSHIBA TEC CORPORATION All rights reserved
+5V, +5VB, -12V
Control panel data bus
(OD0-7)
Serial data
(OPLDSO)
Buzzer ON signal
(BZON)
Fig. 5-5
5 - 5
Control panel
LCD
Panel controlling
ASIC
Hard-key matrix
LED
driver
LED
Buzzer
e-STUDIO167/207/237
CONTROL PANEL
5