DS_6613_018

78M6613 Data Sheet

Rev 2

5

1 Hardware Description

1.1 Hardware Overview

The Teridian 78M6613 single-chip measurement unit integrates all primary functional blocks required to

embed solid-state AC power and energy measurement. Included on chip are:

•

An analog front end (AFE)

•

An independent digital computation engine (CE)

•

An 8051-compatible microprocessor (MPU) which executes one instruction per clock cycle (80515)

•

A voltage reference

•

A temperature sensor

•

RAM and Flash memory

•

A variety of I/O pins

Current sensor technologies supported include Current Transformers (CT) and Resistive Shunts.

In a typical application, the 32-bit compute engine (CE) of the 78M6613 sequentially processes the

samples from the voltage inputs on pins A0, A1, A2, A3 and performs calculations to measure active

measurements are then accessed by the MPU, processed further and output using the peripheral

interfaces available to the MPU.

In addition to the temperature-trimmed ultra-precision voltage reference, the on-chip digital temperature

compensation mechanism includes a temperature sensor and associated controls for correction of

unwanted temperature effects on measurement. Temperature dependent external components such as

crystal oscillator, current transformers (CTs), and their corresponding signal conditioning circuits can be

characterized and their correction factors can be programmed to produce measurements with

exceptional accuracy over the industrial temperature range, if desired.

A block diagram of the IC is shown in Figure 1. A detailed description of various functional blocks

follows.