CSR8635 查看數據表（PDF） - CSR plc

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CSR8635

The CSR8635 QFN single-chip Bluetooth® audio ROM device targets mid-range stereo speakers and headsets.

CSR plc 

1.4 PCB Design and Assembly Considerations

This section lists recommendations to achieve maximum board-level reliability of the 8 x 8 x 0.9mm QFN 68-lead

package:

■ NSMD lands (lands smaller than the solder mask aperture) are preferred, because of the greater accuracy of

the metal definition process compared to the solder mask process. With solder mask defined pads, the overlap

of the solder mask on the land creates a step in the solder at the land interface, which can cause stress

concentration and act as a point for crack initiation.

■ CSR recommends that the PCB land pattern is in accordance with IPC standard IPC-7351.

■ Solder paste must be used during the assembly process.

1.5 Typical Solder Reflow Profile

For

information,

see Typical Solder Reflow Profile for Lead-free Devices

Prepared for qingbo keven.zhou - excelpoint.com.cn

Information Note.

- Friday, September

27,

2013

Production Information

© Cambridge Silicon Radio Limited 2013

Confidential Information - This Material is Subject to CSR's Non-disclosure Agreement

Page 21 of 105

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