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TRACE AND SPACE WIDTH for Class 1

Preferred Pad Construction for Class 1 – 0.2/0.2 Surface Mount Technology Recommendations for one trace through 1mm BGA pads are as follows: • Via Pad diameter 0.50mm • Hole callout 0.25mm + 0/-0.25mm • Plane anti-pad 0.7mm • Trace width 0.2mm/Space width 0.2mm • These designs require 0.5‡ ounce outer layer copper foil construction for […]

Complexity Factors Matrix

Expedition Basic

basic

CAN H and CAN

The ISO 11898−2 bus consists of the CAN_H (high) and CAN_L (low) data lines and a common ground signal. A 120  termination resistor is located at each end of the bus to minimize reflections and ringing on the waveforms

Motor opration

How to motor move one direction or both direction : The first is a low-side drive and the second is a high-side drive. The advantage to using the low-side drive is that a FET driver is not typically needed. Bidirectional control of a BDC motor requires a circuit called an H-bridge. The H-bridge, named for […]

EXPEDITION SUPPORT

https://www.ece.ucsb.edu/Faculty/Johnson/ECE189/Mentor2007/ [AdSense-A]

SKEW

In systems where parallel paths are used to increase speed, all paths must have the same propagation time. If the connecting medium is coaxial cable, tight control of mechanical length and dielectric tolerances will produce minimal problems with skew. However, when balanced twisted pairs are the conducting medium, the number of turns per inch is […]

SDRAM

SDRAM (synchronous DRAM) is a generic name for various kinds of dynamic random access memory (DRAM) that are synchronized with the clock speed that the microprocessor is optimized for. This tends to increase the number of instructions that the processor can perform in a given time. The speed of SDRAM is rated in MHz rather than in nanoseconds (ns). […]

BIT rate

Bit Rate – In telecommunications, computing and digital communications, bit rate is the number of bits (1/0) that are conveyed or processed per unit of time. The bit rate is quantified using the bits per second (symbol: “bit/s”), often in conjunction with an SI prefix such as” kilo” (1 kbit/s = 1000 bit/s), “mega” (1 […]

EMI-EMC

SAE develops and maintains standards mainly for use in North America vehicle (SAE J551-xx) and component (SAE J1113-xx). 2004/104/EC, which surpassed 95/54 EC, is a European directive for vehicle EMC automotive components follow the directions given in the CISPR 25 document. CISPR 12 deals with “radio disturbance characteristics for the protection of off-board receivers CISPR […]

Standard for automotive