User's Manual

Product datasheet
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3.4 UIM Interface
IMS2 modules provide a UIM_DETECT input pin for UIM connectors to detect a UIM
card. When a UIM card is present, UIM_DETECT should be high (1.8 V). If the UIM
card is absent, UIM_DETECT should be low. This is required to pull UIM_DETECT to
VREF with a 470 kΩ resistor. A 0.1 μF and a 33 pF capacitor are recommended to
place between UIM_VCC and Ground in parallel. We recommend placing a 33 pF
capacitor between UIM_RESET, UIM_CLK, and UIM_DATA and Ground in parallel.
(Refer to Figure 5.)
An electrostatic discharge (ESD) protection circuit is also recommended to place near
the UIM socket as close as possible, and the Ground pin of the ESD protection
component must be well connected to the Ground plane.
The following figure illustrates an example UIM card circuit. The default
configuration is active high.
Figure 3-3. Example UIM card circuit
3.5 I/O Characteristics
The voltage and current characteristics of the various IO pads of the IMS2 versus IO
bank supply voltage are illustrated in Table 3-3 below.
Table 3-3. DC characteristics for digital IOs, voltage 1.8 V - BIDIR and IN types
Parameter
Drive
Strength
Min.
Nom.
Max.
Unit
VIL
Input low voltage
VSS
0.3 × PVDD_1V8
V
VIH
Input high voltage
0.7 × PVDD_1V8
PVDD_1V8
V