Sim Interface - LG GD910 Service Manual

3. BB Circuit Technical brief

3.5 SIM Interface

GD910 supports 1.8V & 2.9V plug in SIM. SIM_IO, SIM_CLK, SIM_RST ports are used to communicate with S-
Gold3H and the SIM power supply enabled by PMIC.
SIM Interface
SIM_CLK : SIM card reference clock
SIM_RST : SIM card Async /sync reset
SIM_IO : SIM card bidirectional reset
SIM
SIM_IO
LGE Internal Use Only
2V9_SIM
R212
J200
4.7K
4
GND1 VCC
5
VPP RST
6
IO CLK
10
GND5 GND2
9
GND4 GND3
C245
33p
Figure 3.5-1] SIM Circuit
GD910 service manual
GD910 service manual
2V9_SIM
1
2
3
7
8
C246 C247
DNI 1u
- 38 - Copyright © 2009 LG Electronics. Inc. All right reserved.
SIM_RST
SIM_CLK
C248
33p
Only for training and service purposes