UMTS/HSDPA Module
UC15 Hardware Design
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3.11. USIM Card Interface
3.11.1. USIM Card Application
The USIM card interface circuitry meets ETSI and IMT-2000 USIM interface requirements. Both 1.8V and
3.0V USIM cards are supported.
Table 15: Pin Definition of the USIM Interface
Pin Name
Pin No.
I/O
Description
Comment
USIM_VDD
12
PO Power supply for USIM card.
Either 1.8V or 3V is supported by
the module automatically.
USIM_DATA
13
IO
Data signal of USIM card.
USIM_CLK
14
DO Clock signal of USIM card.
USIM_RST
15
DO Reset signal of USIM card.
USIM_
PRESENCE
11
DI
USIM card detection input.
2.6V power domain.
USIM_GND
8
Specified ground for USIM card.
The following figure shows the reference design of the 8-pin USIM card.
Figure 23: Reference Circuit of the 8 Pin USIM Card