Sim Interface; Uart Interface - LG MG180C Service Manual

3.4.4. SIM Interface

SIM interface scheme is shown in (Figure 8).
SIM_IO, SIM_CLK, SIM_RST ports are used to communicate DBB with ABB and the Charge Pump in
ABB enables 1.8V/3V SIM operation.
SIM Interface
SIM_CLK SIM card reference clock
SIM_RST SIM card async/sync reset
SIM_IO SIM card bidirectional data line
SIM_PWCTRL SIM card power activation
SIM_CD SIM card presence detection
DBB
SIM_IO
SIM_CLK
SIM_RST
SIM_PWRCTRL
SIM_CD

3.4.5. UART Interface

MG180c has two UART Drivers as follow :
UART : Hardware Flow Control / Fax & Data Modem
V_IO
VRSIM
DBBSIO
DBBSCK
DBBSRST
10k
SIMCLK
S IMIO
SIMRST
100k
Figure 8. SIM Interface
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3. H/W Circuit Description
ABB V_SIM
10k
22p
SIM
VPP
CLK
IO
RST
0.1u