19-2838; Rev 0; 4/03
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
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/dif-
ferential mux accepts voltage and remote-diode tem-
perature-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 num-
ber of fault cycles allowed, before generating an inter-
rupt. These ADCs can also perform recursive data
averaging for noise reduction. Programmable wait inter-
vals 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). AutoShutdown
TM
reduces supply
current to 190µA at 2ksps and to less than 8µA 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-pow-
ered applications.
Features
o
Monitor 10 Signals Without Processor
Intervention
o
Eight External Channels Programmable as
Temperature or Voltage Monitors
o
Intelligent Circuitry for Reliable Autonomous
Measurement
Programmable Digital Averaging Filter
Programmable Fault Counter
o
Precision Measurements
12-Bit Resolution
±1 LSB INL, ±1 LSB DNL
±0.75°C Temperature Accuracy (typ)
o
Flexible
Automatic Channel Scan Sequencer with
Programmable Intervals
Programmable Inputs: Single Ended/Differential,
Voltage/Temperature
Programmable Wait State
o
Internal 2.5V/4.096V Reference
(MAX1253/MAX1254)
o
Remote Temperature Sensing Up to 10m
(Differential Mode)
o
Single 3V or 5V Supply Operation
o
Small 16-Pin TSSOP Package
MAX1253/MAX1254
Applications
System Supervision
Remote Telecom Networks
Server Farms
Remote Data Loggers
PART
MAX1253AEUE*
MAX1253BEUE
MAX1254AEUE*
MAX1254BEUE
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
16 TSSOP
16 TSSOP
16 TSSOP
*Future
product—contact factory for availability.
Selector Guide
PART
MAX1253AEUE*
MAX1253BEUE
MAX1254AEUE*
MAX1254BEUE
INL (LSB)
±1
±1
±1
±1
TEMP
ERROR (°C)
±1.0
±3.0
±1.0
±2.5
SUPPLY
VOLTAGE (V)
2.7 to 3.6
2.7 to 3.6
4.5 to 5.5
4.5 to 5.5
Pin Configuration
TOP VIEW
AIN0 1
AIN1 2
AIN2 3
AIN3 4
AIN4 5
AIN5 6
AIN6 7
16 CS
15 SCLK
14 DIN
MAX1253
MAX1254
13 V
DD
12 GND
11 DOUT
10 INT
9
REF
*Future
product—contact factory for availability.
Typical Application Circuit appears at end of data sheet.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
AIN7 8
16 TSSOP
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
