Usim Interface - Sierra Wireless MC5725 Hardware Integration Manual

Rev 1.9.1 Feb.09
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Figure 5-1: Example LED
MiniCard
MIO

USIM interface

Note: This section applies only to GSM (MC87xx) modules.
The module is designed to support one USIM (Universal
Subscriber Identity Module). The USIM holds account infor‐
mation, allowing users to use their account on multiple
devices.
The USIM interface has four signals (plus Ground). These are
defined in Table 5‐3 with an example circuit shown in
Figure 5‐2. (For USIM card contacts, see Figure 5‐3.)
Table 5-3: USIM pins
Pin name USIM contact
number
XIM_VCC
XIM_RESET
XIM_CLK
XIM_DATA
XIM_GND
Proprietary and Confidential
VCC 3.3V
Current limiting Resistor
LED
Function
1 USIM VCC
2 Active low USIM reset
3 Serial clock for USIM data
7 Bi-directional USIM data line
5 Ground
Host / Module Interfaces
65