LG KP260 Service Manual page 25

3. TECHNICAL BRIEF
D. SIM interface
The AD6726 provides SIM Interface Module. The AD6726 checks status periodically during
established call mode whether SIM card is inserted or not, but it doesn't check during deep Sleep
mode. In order to communicate with SIM card, 3 signals SIM_DATA, SIM_CLK, SIM_RST(GPIO_23)
are required. The descriptions about the signals are given by bellow Table 3-5 in detail.
Signals
SIM_DATA
SIM_CLK
SIM_RST
(GPIO_23)
SIM_DATA
LGE Internal Use Only
This pin receives and sends data to SIM card.
This model can support 3.0 volt and 1.8 volt interface SIM card.
Clock 3.25MHz frequency.
Reset SIM block
Table 3.5.D SIM CONTROL SIGNALS DESCRIPTION
2V85_VSIM
4
GND
5
R315 VPP
6
I_O
8
0 GND2
C326
DNI
Figure 3.5.D2 SIM Interface of AD6726
- 26 -
Description
2V85_VSIM
J300
1
VCC
2
RST
3
CLK
7
GND1
C327 C328 C329
220n DNI 1000p
Copyright © 2008 LG Electronics. Inc. All right reserved.
SIM_RST
SIM_CLK
Only for training and service purposes