INTRODUCTION

The SMD1102, SMD1103 and SMD1113 each contain a 10-Bit data acquisition system (DAS) with dedicated EEPROM alarm limit storage. The three devices communicate with the host µP via a standard two-wire I2C serial interface. After initialization the SMD1102/1103/1113 can automatically monitor one or more analog input channels. If any input signal moves beyond its user-programmed limits the host is notified by the SMBALERT#output, enabling fault prediction in telecom line card applications, as an example.

FEATURES

● Complete Data Acquisition System

♦ 10-Bit A/D Converter Resolution

♦ 75µs Acquisition plus Conversion Time

♦ Alarm Limits for Each Input Channel

♦ Auto-Increment of Input Channels

♦ Two Wire I2C Serial Data Interface

♦ System Management Bus (SMBus) Compatible

♦ Auto-Monitor with SMBALERT Output

♦ Low Quiescent Current of 50µA

♦ Wide Supply Voltage Range: 2.7V to 5.5V

● SMD1102

♦ 2-Channel Analog Input

♦ External Voltage Reference Input Provided for Absolute Measurements

● SMD1103

♦ 3-Channel Analog Input

♦ Reference Voltage Input for the A/D Converter is Connected to VDD for Ratiometric Measurements

● SMD1113

♦ Extended I2C Operation

♦ 3-Channel Analog Input

♦ External Voltage Reference Input Provided for Absolute Measurements