Sierra Wireless AirPrime HL8518, Product Technical Specification, Page: 25 / 41

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Product Technical Specification Detailed Interface Specifications
2.7.3. UIM1_DET
UIM1_DET is used to detect and notify the application about the insertion and removal of a SIM
device in the SIM socket connected to the main SIM interface (UIM1). When a SIM is inserted, the
state of UIM1_DET transitions from logic 0 to logic 1. Inversely, when a SIM is removed, the state of
UIM1_DET transitions from logic 1 to logic 0.
The GPIO used for UIM1_DET is GPIO3.
Enabling or disabling this SIM detect feature can be done using the
AT+KSIMDET
command. For more
information about this command, refer to document [2] AirPrime HL6 and HL8 Series AT Commands
Interface Guide.
2.7.4. Application
2.7.4.1. Reference Schematic
Figure 6. UIM1 Application Reference Schematic
2.7.4.2. USIM Socket Pin Description
The following table describes the required USIM socket pins.
Table 16. USIM Socket Pin Description
Pin Number Signal Name Description
1 UIM1_VCC UIM1 Power supply
2 UIM1_RESET UIM1 Reset
3 UIM1_CLK UIM1 Clock
4 UIM1_DET UIM1 detection
5 GROUND GND
6 - -
7 UIM1_DATA UIM1 Data
8 VGPIO Power supply