 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
EM1402 Datasheet(PDF) 4 Page - Protek Devices |
|
||||||||||||||||||||||||||||||
EM1402 Datasheet(HTML) 4 Page - Protek Devices |
|
|
4 / 6 page  4 05219.R1 2/07 www.protekdevices.com EM1402 APPLICATION NOTE The EM1402 provides a bidirectional filter and protector for all the signals and the power line on the SIM (sub- scriber indenty module) card connector. SIM cards are found in all GSM cellular phones and in some other handheld 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 contact or during insertion of the SIM card into the card slot. The EMI filter suppresses all high-frequency noise, preventing 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 1. For best filter and ESD performance, both ground bumps (B1, B2) of the EM1402 should be directly connected to the ground plane. A small capacitor of about 1µF is required next to the V CC pin of the SIM connector in order to improve stability of the SIM card supply rail. CIRCUIT BOARD LAYOUT RECOMMENDATIONS Circuit board layout is critical for Electromagnetic Compatibility (EMC) protection. The following guidelines are recommended: ✔ The protection device should be placed near the input terminals or connectors, the device will divert the transient current immediately before it can be coupled into the nearby traces. ✔ The path length between the TVS device and the protected line should be minimized. ✔ All conductive loops including power and ground loops should be minimized. ✔ The transient current return path to ground should be kept as short as possible to reduce parasitic inductance. ✔ Ground planes should be used whenever possible. For multilayer PCBs, use ground vias. Controller with logic level translator 100 Ohm 47 Ohm 100 Ohm RST CLK I/O VCC 1µF GND GND 5V/3V/1.8V Data I/O Clock Reset SIM Card Connector VCC supply (5V, 3.3V or 1.8V) Figure 1. Typical Application for SIM Card Interface |
Similar Part No. - EM1402 |
|
Similar Description - EM1402 |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
