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MMA8652FCR1 データシート(PDF) 69 Page - Freescale Semiconductor, Inc

部品番号 MMA8652FCR1
部品情報  Xtrinsic MMA8652FC 3-Axis, 12-bit Digital Accelerometer
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メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MMA8652FCR1 データシート(HTML) 69 Page - Freescale Semiconductor, Inc

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MMA8652FC
Sensors
Freescale Semiconductor, Inc.
69
7
Mounting Guidelines
Surface mount printed circuit board (PCB) layout is a critical portion of the total design. The footprint for the surface mount
packages must be the correct size to ensure proper solder connection interface between the PCB and the package. With the
correct footprint, the packages will self-align when subjected to a solder reflow process. These guidelines are for soldering and
mounting the Dual Flat No-Lead (DFN) package inertial sensors to PCBs. The purpose is to minimize the stress on the package
after board mounting. The MMA865xFC digital output accelerometers use the DFN package platform. This section describes
suggested methods of soldering these devices to the PCB for consumer applications.
7.1
Overview of soldering considerations
Information provided here is based on experiments executed on DFN devices. They do not represent exact conditions present
at a customer site. Therefore, this information should be used as guidance only and process and design optimizations are
recommended to develop an application specific solution. It should be noted that with the proper PCB footprint and solder stencil
designs, the package will self-align during the solder reflow process.
7.2
Halogen content
This package is designed to be Halogen Free, exceeding most industry and customer standards. Halogen Free means that no
homogeneous material within the assembly package shall contain chlorine (Cl) in excess of 700 ppm or 0.07% weight/weight or
bromine (Br) in excess of 900 ppm or 0.09% weight/weight.
7.3
PCB mounting/soldering recommendations
1.
The PCB land should be designed as Non Solder Mask Defined (NSMD) as shown in Figure 62.
2.
No additional via pattern underneath package.
3.
PCB land pad is 0.6 mm x 0.225 mm as shown in Figure 62.
4.
Solder mask opening = PCB land pad edge + 0.125 mm larger all around = 0.725 mm x 1.950 mm
5.
Stencil opening = PCB land pad -0.05 mm smaller all around = 0.55 mm x 0.175 mm.
6.
Stencil thickness is 100 or 125 um.
7.
Do not place any components or vias at a distance less than 2 mm from the package land area. This may cause
additional package stress if it is too close to the package land area.
8.
Signal traces connected to pads are as symmetric as possible. Put dummy traces on NC pads, to have same length of
exposed trace for all pads.
9.
Use a standard pick and place process and equipment. Do not use a hand soldering process.
10. Use caution when putting an assembled PCB into an enclosure, noting where the screw-down holes are and if any
press-fitting is involved. It is important that the assembled PCB remain flat after assembly, to ensure optimal electronic
operation of the device.
11. The PCB should be rated for the multiple lead-free reflow condition with max 260°C temperature.
12. No copper traces on top layer of PCB under the package. This will cause planarity issues with board mount. Freescale
DFN sensors are compliant with Restrictions on Hazardous Substances (RoHS), having halide free molding compound
(green) and lead-free terminations. These terminations are compatible with tin-lead (Sn-Pb) as well as tin-silver-copper
(Sn-Ag-Cu) solder paste soldering processes. Reflow profiles applicable to those processes can be used successfully
for soldering the devices.


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