MAX1254

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 ±0.75Temperature 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

System Supervision Remote Telecom Networks Server Farms Remote Data Loggers

VDD to GND ...............................................................-0.3V to +6V
Analog Inputs to GND (AIN0AIN7, REF) ... .-0.3V to (VDD + 0.3V)
Digital Inputs to GND (DIN, SCLK, CS) .... .....-0.3V to (VDD + 0.3V)
Digital Outputs to GND (DOUT, INT) ........ ....-0.3V to (VDD + 0.3V)
Digital Outputs Sink Current ............................................. ...25mA
Maximum Current into Any Pin .......................................... ...50mA
Continuous Power Dissipation (TA = +70)
16-Pin TSSOP (derate 8.7mW/ above +70) ..................696mW
Operating Temperature Range .............................-40°C to +85
Junction Temperature..........................................................+150
Storage Temperature Range .................................-65 to +150
Lead Temperature (soldering, 10s) ....................................+300

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.

At the maximum sampling rate of 94ksps (auto mode, single channel enabled), the MAX1253 consumes only 5mW (1.7mA at 3V). AutoShutdownTM reduces supply current to 190A at 2ksps and to less than 8A at 50sps.

Stand-alone operation, combined with ease of use in a small package (16-pin TSSOP), makes the MAX1253/ MAX1254 ideal for multichannel system-monitoring applications. Low power consumption also makes these devices a good fit for hand-held and battery-powered applications.