我做过的几个项目ESD解决问题的方法Word文档下载推荐.docx

1、2. The mobile will lose communication and search network again when discharging to side key and camera decoration ring at air5KV in communication state with mobile downwards,3. The mobile will power off or lost network when releasing static from the headset speaker at air 5KV in mobile with headset

2、state. 4. The PA will destroy when discharging to the camera decoration ring at air 5KV.For these problems, the solutions are as follow,Problem 1 improvement:Make the metal dome and MMI GND well connected with two points, and keep the resistance between metal dome and the GND under 2 ohm ,After impr

3、ovement, it is OK for ESD at air 10KV on the arrow key and data key.Problem 2 improvement: （1）Scratch the NBSCAN test point which is just under the metal dome.（2）Add a 10nf capacitor on the NBSCAN test point.（3）Change the former sparse metal dome with dense metal dome.After improvement, it is OK for

4、 ESD at air 10KV on the position of side key and camera decoration ring.Problem 3 improvement:（1） Add TVS ESDAVLC6V1-1M2 on the HSGND, it is OK for ESD at air 10KV.（2） Add 10nf capacitor on the HSGND, it is OK for ESD at air 10KV.After improvement, it is OK for ESD at air 10KV when releasing static

5、from the headset speaker.Problem 4 improvement:Use isolated tape to cover the antenna which is near the gap of the camera decoration ringAfter improvement, it is OK for ESD at air 10KV when discharging to the camera decoration ring.1.1. key PAD PROBLEM DescriptionWhen discharging to arrow key and da

6、ta key at air6KV in communication state, the mobile will lose communication and search network again. Problem analysisAt first the metal dome is connected with the GND by one point and the resistance between the metal dome and the GND is bigger than 2 ohm, when discharging to arrow key and data key

7、at air 7KV in communication status, the mobile will lose network and search network again.Only one point for metal dome to connect with GND, the resistance between metal dome and GND is bigger than 2 ohm ImprovementWhen keep the resistance between metal dome and the GND under 2 ohm ,it will not lose

8、 network again at air 10KV, so it is advised to keep the metal dome connected with the GND by two point and keep the resistance between them under 2 ohm.Use two points to make metal dome connect with the GND well and keep the resistance between them under 2 ohm.1.2. side key and camera decoration ri

9、ng PROBLEM When discharging to side key and camera decoration ring at air5KV in communication state with mobile downwards, the mobile will lose communication and search network again.As the NBSCAN test point is just under the metal dome and very sensitive to ESD, when mobile downwards, the NBSCAN te

10、st point is easily affected by coupling electric field formed between workbench and the MMI. When discharging to side key and camera decoration ring at airThe NBSCAN test point is very sensitive to ESD.Dense metal domeSparse metal domeChange the former sparse metal dome with dense metal dome（1）Scrat

11、ch the NBSCAN test point which is just under the metal dome,it is OK for ESD at air 10KV on the position of side key and camera decoration ring（2）Add a 10nf capacitor on the NBSCAN test point, it is OK for ESD at air 10KV on the position of side key and camera decoration ring（3）Change the former spa

12、rse metal dome with dense metal dome, it is OK for ESD at air 10KV on the position of side key and camera decoration ring.1.3. releasing STATIC PROBLEM The mobile will power off or lost network when releasing static from the headset speaker at air 5KV in mobile with headset state.As the C501 10nf ca

13、pacitor on the HSGND is not mounted, when releasing static from the headset speaker, the mobile will power off or lost network.As NM C501, when releasing static from the headset speaker, the mobile will power off or lost network.1.4. PA DESTROY PROBLEM The PA will destroy when discharging to the camera decoration ring at air As antenna is very near from the camera decoration ring, when discharging to the gap of the ring, ESD will easily release to