MAX1254EVC16 Maxim Integrated, MAX1254EVC16 Datasheet

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MAX1254EVC16

Manufacturer Part Number
MAX1254EVC16
Description
Analog to Digital Converters - ADC Stand-Alone 10-Channel 12-Bit System Monitors with Internal Temperature Sensor and VDD Monitor
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX1254EVC16

Number Of Channels
10
Architecture
SAR
Conversion Rate
94 KSPs
Resolution
12 bit
Input Type
Single-Ended/Differential
Interface Type
Serial
Operating Supply Voltage
4.5 V to 5.5 V
Number Of Converters
1
Voltage Reference
Internal 4.096 V or External
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
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.
19-2838; Rev 0; 4/03
*Future product—contact factory for availability.
Typical Application Circuit appears at end of data sheet.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
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.
MAX1253AEUE*
MAX1253BEUE
MAX1254AEUE*
MAX1254BEUE
with Internal Temperature Sensor and V
Stand-Alone, 10-Channel, 12-Bit System Monitors
PART
System Supervision
Remote Telecom Networks
Server Farms
Remote Data Loggers
________________________________________________________________ Maxim Integrated Products
INL (LSB)
±1
±1
±1
±1
General Description
ERROR (°C)
Selector Guide
TEMP
±1.0
±3.0
±1.0
±2.5
Applications
TM
reduces supply
VOLTAGE (V)
2.7 to 3.6
2.7 to 3.6
4.5 to 5.5
4.5 to 5.5
SUPPLY
o Monitor 10 Signals Without Processor
o Eight External Channels Programmable as
o Intelligent Circuitry for Reliable Autonomous
o Precision Measurements
o Flexible
o Internal 2.5V/4.096V Reference
o Remote Temperature Sensing Up to 10m
o Single 3V or 5V Supply Operation
o Small 16-Pin TSSOP Package
*Future product—contact factory for availability.
MAX1253AEUE*
MAX1253BEUE
MAX1254AEUE*
MAX1254BEUE
TOP VIEW
Intervention
Temperature or Voltage Monitors
Measurement
(MAX1253/MAX1254)
(Differential Mode)
Voltage/Temperature
Programmable Wait State
Programmable Digital Averaging Filter
Programmable Fault Counter
12-Bit Resolution
±1 LSB INL, ±1 LSB DNL
±0.75°C Temperature Accuracy (typ)
Automatic Channel Scan Sequencer with
Programmable Intervals
Programmable Inputs: Single Ended/Differential,
PART
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
1
2
6
3
4
5
7
8
Ordering Information
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
16 TSSOP
MAX1253
MAX1254
Pin Configuration
DD
16
15
14
13
12
11
10
9
Monitor
SCLK
DIN
V
GND
DOUT
INT
REF
CS
DD
PIN-PACKAGE
16 TSSOP
16 TSSOP
16 TSSOP
16 TSSOP
Features
1

Related parts for MAX1254EVC16

MAX1254EVC16 Summary of contents

Page 1

... MAX1254BEUE *Future product—contact factory for availability. Typical Application Circuit appears at end of data sheet. AutoShutdown is a trademark of Maxim Integrated Products, Inc. ________________________________________________________________ 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. ...

Page 2

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V ABSOLUTE MAXIMUM RATINGS GND .............................................................-0.3V to +6V Analog Inputs to GND (AIN0–AIN7, REF) ... -0. Digital Inputs to GND (DIN, SCLK, CS) .... -0.3V ...

Page 3

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V (MAX1253 10MHz (50% duty cycle MIN PARAMETER SYMBOL Input Leakage Current ...

Page 4

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V ELECTRICAL CHARACTERISTICS (continued +2.7V to +3.6V (MAX1253 10MHz (50% duty cycle MIN PARAMETER SYMBOL DIGITAL INPUTS (SCLK, ...

Page 5

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V TIMING CHARACTERISTICS (V = +2.7V to +3.6V (MAX1253 PARAMETER SCLK Clock Period SCLK Pulse Width High Time SCLK Pulse Width Low Time DIN to SCLK Setup ...

Page 6

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and +3V 2.5V (MAX1253 REF DD erwise noted.) INTEGRAL NONLINEARITY vs. DIGITAL OUTPUT CODE 1.0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 ...

Page 7

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and +3V 2.5V (MAX1253 REF erwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE INTERNAL REFERENCE (MODE 01) 4.3 9 TEMPERATURE CHANNELS 3.9 AND VOLTAGE CHANNEL ...

Page 8

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and +3V 2.5V (MAX1253 REF DD erwise noted.) EXTERNAL TEMPERATURE SENSOR TEMPERATURE ERROR 2.0 MAX1253/MAX1254 1.6 1.2 EXTERNAL SENSOR, DIFFERENTIAL INPUT 0.8 0.4 0 ...

Page 9

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and REFERENCE TEMP SENSOR AIN1 AIN2 MUX AIN3 AIN4 AIN5 AIN6 AIN7 INTERNAL TEMP V /2 AIN0 DD ACCUMULATOR ACCUMULATOR ACCUMULATOR UPPER UPPER UPPER THRESHOLD THRESHOLD THRESHOLD LOWER ...

Page 10

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V 100nA DOUT DOUT 100nA C = 100pF LOAD GND HIGH Figure 1. Load Circuits for DOUT Enable Time and SCLK ...

Page 11

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and AIN0 AIN1 AIN2 MUX AIN3 AIN4 AIN5 AIN6 AIN7 TEMP SENSE Figure 3. Simplified Alarm Block Diagram of the MAX1253/MAX1254 During the acquisition interval, IN+ and IN- ...

Page 12

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V INCREMENT FAULT COUNTER Figure 4. Alarm Flowchart 12 ______________________________________________________________________________________ IS CHANNEL ENABLED? YES SAMPLE CHANNEL CONVERT CHANNEL AVERAGE CONVERTED CHANNEL DATA IS SAME FAULT AVG DATA YES YES AS ...

Page 13

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and CHOLDP 8-TO-1 DIFFERENTIAL H MUX CHOLDN TEMP DIFFERENTIAL INPUT EQUIVALENT INPUT CIRCUIT Figure 5. Single-Ended/Differential Input Equivalent Input Circuit In differential mode, the ...

Page 14

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and CSS t CL SCLK DIN HIGH-Z t DOE DOUT Figure 6. Detailed Serial Interface Timing Diagram Clock pulses on SCLK shift data into ...

Page 15

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Table 2. Command Description DATA BYTES AFTER COMMAND WORD COMMAND WORD BYTES TO DIN FROM DOUT 0000#### 0 0001xxxx 0 0010#### 0 0011#### 0 0100#### 0 0101xxxx 0 0110xxxx ...

Page 16

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Read Alarm Register (Command Code 0001) The Read Alarm Register command, 0001, outputs the current status of the alarm register (see Table 11). The address bits in this command ...

Page 17

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Read Global Configuration Register (Command Code 0101) The Read Global Configuration Register command, 0101, outputs the global configuration registers. The address bits following this command are ignored. When the ...

Page 18

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Write-Selected Channel Configuration Registers (Command Code 1100) The Write-Selected Channel Configuration Register com- mand, 1100, writes to the three channel configuration registers for the addressed channel (see Table 3). ...

Page 19

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V The 8-bit setup register (Table 7) holds configuration data common to all input channels. At power-up and after a RESET command, this register defaults to 00000000b. Setup Register: Sample ...

Page 20

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Setup Register: Scan Mode Bit (B2) The scan mode bit selects between automatic scan- ning and manual conversion mode. When set (B2 = 1), the MAX1253/MAX1254 enter auto- matic ...

Page 21

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Table 13. Channel Configuration Register Format B7 (MSB) B6 Fault B3 Fault B2 Fault B1 Table 14. Conversion Average Encoding CODE 0000 0001 0010 0011 0100 0101 0110 0111 ...

Page 22

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Upper Threshold Register A conversion result greater than the value stored in the upper threshold register results in a fault, increasing the internal fault counter by one. When the ...

Page 23

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V ential, or unipolar/bipolar), carry out the following steps to execute a manual conversion. See Figure 9 for man- ual conversion timing: 1) Disable autoscan (set up register scan mode ...

Page 24

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V The temperature measurement process is fully auto- mated in the MAX1253/MAX1254. All steps are sequenced and executed by the MAX1253/MAX1254 each time an input channel (or an input channel ...

Page 25

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Channel-Enable Register Power-Up/Reset Defaults At power-on or after a RESET command, the channel- enable register resets to FF hex, enabling all channels: the internal temperature sensor, the V AIN0–AIN7. ...

Page 26

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V Automatic Reference Shutdown The MAX1253/MAX1254 enter an automatic shutdown mode when in reference mode 00 or when the sample wait is greater than 80µs in reference mode 01. Using ...

Page 27

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V OUTPUT CODE V REF FS = 011....111 2 011....110 REF - 000....010 V REF 1 LSB = 000....001 4096 000....000 111....111 111....110 111....101 ...

Page 28

Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and V The gain error is the difference between the ideal and actual value of the analog input difference between the first and last transitions of the ADC output. The first ...

Page 29

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 29 © 2003 Maxim Integrated Products ...

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