Sim Interface - LG KM710 Service Manual

3. HW Circuit Description

3.3.4 SIM interface

SIM interface scheme is shown in below.
SIM_IO, SIM_CLK, SIM_RST, SIM_PWRCTRL ports are used to communicate DBB via ABB with
plugged sim card and the LDO (VRSIM) in ABB enables operate 1.8V to 2.5V to search SIM card
SIM_CLK: SIM Card reference clock
SIM_RST: SIM Card async/sync reset
VRUSIM(Power supply VCC): 3 V 10% (class B) or 1.8 V 10% (class C)
Misc_ext_irq: USIM card presence detection (USIM_CD) purposes.
LGE Internal Use Only
<Fig.9> SIM Interface
SIM_PWCTRL: SIM Card power activation
SIM_IO: SIM Card bi-directional data line
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