Only For Training And Service Purposes - LG KG290 Service Manual

D. SIM interface
The AD6721 provides SIM Interface Module. The AD6721 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 CONNECTOR
Copyright © 2007 LG Electronics. Inc. All right reserved.

Only for training and service purposes

This pin receives and sends data to SIM card.
This model can support only 3.0 volt interface SIM card.
Clock 3.25MHz frequency.
Reset SIM block
Table 3-5. SIM CONTROL SIGNALS DESCRIPTION
2V85_VSIM
R235
15K
R236 0
SIM_DATA
C237
NA
Figure 3-5. SIM Interface of AD6721
3. TECHNICAL BRIEF
Description
2V85_VSIM
J202
4 1
C5 C1
5 2
C6 C2
6 3
C7 C3
10 7
GND4 GND1
9 8
GND3 GND2
- 25 -
SIM_RST
SIM_CLK
C236 C238 C239
220n NA 1000p
LGE Internal Use Only