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電路硬體設計(hardware design consider
Johnsonhk88 | 2010-01-29 11:02:52    阅读:2363   发布文章

Hardware design consideration:

A). Sourcing –easy to find distributors, short FOB times(order time), seek similar function with different brand. 

B). cost – (low unit price, compare the different brand with similar function)

C). function – (general requirement , specify requirement, additional function provided by IC)

D). operation condition

--Voltage range (high, low voltage)

-- Current range (high, low current)

-- Battery capacity requirement, operational battery life

-- Component power rate

-- Overall power consumption

-- Clock frequency

-- Temperature range

-- Tolerance at different condition

E). Interface (schematic design)

-- IO port assignment, Analog or digital interface

-- Serial or parallel interface (e.g. I2C, SPI, UART, USB)

-- control bus, data bus, access bus, clock input pin

-- Component interconnection

F). PCB layout

-- Component physical size

-- IC package, footprint

-- Connector pin assignment, dimension

-- PCB board dimension requirement (thickness)

-- Analog Ground, Digital Ground, trace width, track clearance

--Multilayer (signal layer, ground layer, power layer, via hole)

-- Different Voltage clearance requirement

-- Current Vs trace width ( IPC standard)

-- High frequency (RF) circuit impedance match (track impedance model) 

-- Multi board—(for manufacture) around 120mm x200mm for small, 400mmx400mm for large

-- PCB dimension should match and external casing dimension.

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Tony  2010-01-29 14:20:11 

thank u for sharing

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