General Description

The MAX1253/MAX1254 are stand-alone, 10-channel (8 external, 2 internal) 12-bit system monitor ADCs with internal reference. A programmable single-ended/differential mux accepts voltage and remote-diode temperature-sensor inputs. These devices independently monitor the input channels without microprocessor interaction and generate an interrupt when any variable exceeds user-defined limits. The MAX1253/MAX1254 configure both high and low limits, as well as the number of fault cycles allowed, before generating an interrupt. These ADCs can also perform recursive data averaging for noise reduction. Programmable wait intervals between conversion sequences allow the selection of the sample rate.

Features

♦ Monitor 10 Signals Without Processor Intervention

♦ Eight External Channels Programmable as Temperature or Voltage Monitors

♦ Intelligent Circuitry for Reliable Autonomous Measurement

    Programmable Digital Averaging Filter

    Programmable Fault Counter

♦ Precision Measurements

    12-Bit Resolution

    ±1 LSB INL, ±1 LSB DNL

    ±0.75°C Temperature Accuracy (typ)

♦ Flexible

    Automatic Channel Scan Sequencer with

    Programmable Intervals

    Programmable Inputs: Single Ended/Differential, Voltage/Temperature

    Programmable Wait State

♦ Internal 2.5V/4.096V Reference (MAX1253/MAX1254)

♦ Remote Temperature Sensing Up to 10m (Differential Mode)

♦ Single 3V or 5V Supply Operation

♦ Small 16-Pin TSSOP Package

Applications

    System Supervision

    Remote Telecom Networks

    Server Farms

    Remote Data Loggers