Asic (Ic150) - Panasonic KX-DT543-B Service Manual

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.
IC300
ASIC1
IC410
DCX81
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 .
Standard CLK
(IC150 Internal)
Processing
Main PCB
7
CN400
7
69 8
68
9
10 10
4
11
DYN_CLK
Dynamic Lighting Section
t1
t1 + t2 = 11.4ms
t3 + t4 = 1.2ms
Ope PCB
CN160
CK4M
SDA
SCL
ASIC_RST
ASIC_INT
Dynamic Lighting KEY Scanning
OFF Section Section
t2 t3
12
IC150
ASIC2
8 1
44
7
6
43
5 41
4 38
KEY_CLK DYN_CLK
KEY Scanning Dynamic
OFF Section Lighting Section
t4