Chapter 3



Embedded system interfacing often requires us to mix and match components, exposing incompatibilities. In these cases, an understanding of the circuit characteristics of logic is essential to ensuring that the logic works as intended. This chapter reviews CMOS logic characteristics. Logic levels, current drive capability, and timing are critical requirements for interfacing logic. Design examples include open-collector and high-impedance interfaces and a shaft encoder.


Digital logic; CMOS; MOSFET; LED; Logic levels

3.1 Introduction

Logic design is a critical component in embedded interfaces. When we design logic using components that have been designed to work together, we can concentrate on their logical ...

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