CM1402-03CP 查看數據表（PDF） - California Micro Devices Corp

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CM1402-03CP

SIM Card EMI Filter Array with ESD Protection

California Micro Devices Corp 

CM1402

Application Information

The CM1402 provides a bidirectional filter and protector

for all the signals and the power line on the SIM (sub-

scriber identity module) card connector. SIM cards are

found in all GSM cellular phones and in some other hand-

held devices or card readers. The ESD diodes protect the

controller against possible ESD strikes that may occur

when the connector pins are exposed during direct con-

tact, or during insertion of the SIM card into the card slot.

The EMI filter suppresses all high-frequency noise, pre-

venting the unwanted EMI signals from both entering and

exiting the main board. The signals that interface with the

SIM card are the Reset, the Clock and the bidirectional

data I/O, as shown in Figure 5.

CM1402

100ohm

SIM Card Connector

RST

Reset

Controller

with logic

level

translator

47ohm

CLK

Clock

100ohm

I/O

Data I/O

VCC

supply

(5V,

3.3V or

1.8V)

Note: One channel of the CM1402 with a zener

diode is not shown on the diagram.

GND

VCC

1uF

5V/3V/1.8V

GND

Figure 5. Typical Application Diagram for the SIM Card Interface

For best filter and ESD performance, both GND bumps

(B1, B2) of the CM1402 should be directly connected

to the Ground plane. A small capacitor of about 1μF is

required next to the VCC pin of the SIM connector in

order to improve stability of the SIM card supply rail.

For information on the assembly of the CM1402 to the

PCB (printed circuit board), please refer to the Chip

Scale Package (CSP) Application Note AP217, or con-

tact factory at 800-325-4966 for technical support.

© 2005 California Micro Devices Corp. All rights reserved.

6

490 N. McCarthy Blvd., Milpitas, CA 95035-5112 ● Tel: 408.263.3214 ● Fax: 408.263.7846 ● www.cmd.com 11/02/05

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