User's Manual

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H380-GL Hardware User Manual Page
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3.5 USIM Interface
H380 module has built-in USIM card interface that supports 1.8V and 3V SIM card.
3.5.1 USIM Pins
USIM pins are as below:
Pin
Pin Name
I/O
Reset Value
Pin Description
Type
36
UIM_PWR
PO
USIM power supply
1.8V/3V
30
UIM_RESET
O
PP
USIM reset
1.8V/3V
32
UIM_CLK
O
PP
USIM clock
1.8V/3V
34
UIM_DATA
I/O
PU
USIM data, Internal pull up(4.7KΩ)
1.8V/3V
66
SIM_DETECT
I
USIM detect, pull up(390KΩ)
High-active, high level indicates SIM
card inserted, and low level indicates
SIM card removed
1.8V
3.5.2 USIM Interface Circuit
3.5.2.1 N.C. SIM card slot
The reference circuit design for the N.C. (Normally Closed) SIM card slot is shown in Figure 3-12:
Figure 3-12 Reference Circuit for N.C. SIM Card Slot
The principle description for N.C. SIM card slot is as follows:
 When the SIM card is detached, the CD and SW pins will short, and the SIM_DETECT is low.

When the SIM card is inserted, the CD and SW pins will open, and the SIM_DETECT is high.