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SC806Hardware User ManualPage35 of 70
22
USIM1_ DET
DI
USIM1 plug detection pin
20
USIM2_DIO
I/O
USIM2 data signal
19
USIM2_CLK
DO
USIM2 clock signal
18
USIM2_RST
DO
USIM2 reset signal
17
USIM2_ DET
DI
USIM2 detection pin
21
VDD_ USIM2_L15
PO
USIM2 power supply, 1.8V/2.95V
The USIM card interface reference circuit is as follows:
Figure 11USIM Card Interface Circuit Diagram
Note:
1) The length of the SC806 to the SIM card holder should be less than 100mm.
2) The layout and route of the SIM card must be kept away from EMI interference sources such as RF antenna and
digital switch signal.
Module
VDD_USIM
USIM_RST
USIM_CLK
USIM_DET
USIM_DIO
VCC
RST
CLK
IO
VPP
GND
DET
C1
33pF
`
C2
33pF
C3
33pF
100nF
C4
VDD_1V8_L5
VDD_USIM
D1
ESD
Close to USIM holder
USIM
Holder