Panasonic KX-DT543 - ASIC IC150 Control

12
KX-DT543/KX-DT543-B/KX-DT546/KX-DT546-B
4.2.7. ASIC (IC150)
IC150 controls KEY, LED, EHS and Headset-detect.
An operation clock is provided from IC300. IC410 controls reset signal (L(0V): Reset) for IC150.
IC150 and IC410 are connected via I2C interface.
IC410 checks the presence of IC150 by getting the signal from IC150.
LED and KEY Timing chart
The LED control and the KEY control use the same strobe(STB) signal.
Therefore, the LED control and the KEY control are alternately executed.
The timing chart is as shown in the following .
Main PCB Ope PCB
DCX81
IC410
CN400
7
8
11
10
8
9
CN160
6
5
4
7
43
41
38
44
1
7
4
10
68
69
CK4M
SDA
SCL
ASIC_RST
ASIC_INT
IC150
ASIC2
ASIC1
IC300
DYN_CLK KEY_CLK DYN_CLKStandard CLK
(IC150 Internal)
Processing Dynamic Lighting Section
t1 + t2 = 11.4ms
t3 + t4 = 1.2ms
Dynamic
Lighting Section
Dynamic Lighting
OFF Section
KEY Scanning
Section
KEY Scanning
OFF Section
t1 t2 t3 t4