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12
KX-DT521RU/KX-DT521RU-B
4.2.7.
ASIC (IC205)
IC205 controls KEY, LED and Headset-detect.
An operation clock is provided from IC300. IC410 controls reset signal (L(0V): Reset) for IC205.
IC205 and IC410 are connected via I2C interface.
IC410 checks the presence of IC205 by getting the signal from IC205.
An operation clock is provided from IC300. IC410 controls reset signal (L(0V): Reset) for IC205.
IC205 and IC410 are connected via I2C interface.
IC410 checks the presence of IC205 by getting the signal from IC205.
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 .
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
CN205
6
5
4
7
43
41
38
44
1
7
4
10
68
69
CK4M
SDA
SCL
ASIC_RST
ASIC_INT
IC205
ASIC2
ASIC1
IC300
DYN_CLK
KEY_CLK
DYN_CLK
Standard CLK
(IC205 Internal)
Processing
Dynamic Lighting Section
t1 + t2 = 11.4ms
t3 + t4 = 1.2ms
t3 + t4 = 1.2ms
Dynamic
Lighting Section
Dynamic Lighting
OFF Section
KEY Scanning
Section
KEY Scanning
OFF Section
t1
t2
t3
t4
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