MAXIM MAX1253, MAX1254 User Manual
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.
At the maximum sampling rate of 94ksps (auto mode,
single channel enabled), the MAX1253 consumes only
5mW (1.7mA at 3V). AutoShutdownTMreduces 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-powered applications.
Applications
System Supervision
Remote Telecom Networks
Server Farms
Remote Data Loggers
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
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
________________________________________________________________ Maxim Integrated Products 1
Selector Guide
19-2838; Rev 0; 4/03
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.
*Future product—contact factory for availability.
*Future product—contact factory for availability.
Typical Application Circuit appears at end of data sheet.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Pin Configuration
Ordering Information
查询MAX1253AEUE供应商
PART INL (LSB)
MAX1253AEUE*
MAX1253BEUE
MAX1254AEUE*
MAX1254BEUE
±1 ±1.0
±1 ±3.0
±1 ±1.0
±1 ±2.5
TEMP
ERROR (°C)
SUPPLY
VOLTAGE (V)
2.7 to 3.6
2.7 to 3.6
4.5 to 5.5
4.5 to 5.5
PART TEMP RANGE PIN-PACKAGE
MAX1253AEUE* -40°C to +85°C
MAX1253BEUE -40°C to +85°C
MAX1254AEUE* -40°C to +85°C
MAX1254BEUE -40°C to +85°C
TOP VIEW
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
1
2
3
4
5
6
7
8
MAX1253
MAX1254
16 TSSOP
16
15
14
13
12
11
10
9
16 TSSOP
16 TSSOP
16 TSSOP
16 TSSOP
CS
SCLK
DIN
V
DD
GND
DOUT
INT
REF
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDDto GND .............................................................-0.3V to +6V
Analog Inputs to GND (AIN0–AIN7, REF) ... -0.3V to (V
DD
+ 0.3V)
Digital Inputs to GND (DIN, SCLK, CS) .... -0.3V to (V
DD
+ 0.3V)
Digital Outputs to GND (DOUT, INT) ........ -0.3V to (V
DD
+ 0.3V)
Digital Outputs Sink Current ............................................. 25mA
Maximum Current into Any Pin .......................................... 50mA
Continuous Power Dissipation (TA= +70°C)
16-Pin TSSOP (derate 8.7mW/°C above +70°C) .........696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(VDD= +2.7V to +3.6V (MAX1253), VDD= +4.5V to +5.5V (MAX1254), V
REF
= +2.5V (MAX1253), V
REF
= +4.096V (MAX1254), f
SCLK
= 10MHz (50% duty cycle), TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
DC ACCURACY
Resolution RES 12 Bits
Integral Nonlinearity (Note 1) INL
Differential Nonlinearity DNL No missing codes overtemperature ±1.0 LSB
Offset Error ±4.0 LSB
Gain Error (Note 2)
Offset Error Tempco ±5p p m /°C
Gain and Temperature Coefficient
C hannel - to- C hannel Offset M atchi ng ±0.1 LSB
V DD M oni tor Accur acy Internal reference ±2.5 %
DYNAMIC ACCURACY
(10kHz sine-wave input, 2.5V
Signal-to-Noise Plus Distortion SINAD 70 dB
Total Harmonic Distortion THD Up to the 5th harmonic -76 dB
Spurious-Free Dynamic Range SFDR 72 dB
Full-Power Bandwidth -3dB point 1 MHz
Full Linear Bandwidth S / (N + D) > 68dB 100 kHz
CONVERSION RATE
Single-Channel Throughput Manual trigger, voltage measurement 70 ksps
Power-Up Time t
ANALOG INPUT
Input Voltage Range (Note 5)
Common-Mode Range Differentially configured inputs 0 V
Common-Mode Rejection D i ffer enti all y confi g ur ed i np uts, V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
P-P
(AIN0–AIN7)
(MAX1253), 4.096V
Grade A ±1.0
Grade B ±1.0
External reference ±4.0 LSB
Internal reference 2.0 %FSR
External reference ±2
Internal reference ±30
Voltage measurement, all ref modes 10.6 11.7
CONV
Temp-sensor ref modes 01, 10 46 50.7Conversion Time (Note 3) t
Temp-sensor ref mode 00 73 80
Internal reference (Note 4) 40 45 µs
PU
U ni p ol ar , si ng l e- end ed , or d i ffer enti al i np uts 0 +V
Bipolar, differential inputs -V
(MAX1254), 64ksps, f
P-P
= 10MHz, bipolar input mode)
SCLK
= 0 to V
C M
D D
/ 2 +V
REF
-90 dB
REF
REF
DD
/ 2
LSB
p p m /°C
µs
V
V
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +3.6V (MAX1253), VDD= +4.5V to +5.5V (MAX1254), V
REF
= +2.5V (MAX1253), V
REF
= +4.096V (MAX1254), f
SCLK
= 10MHz (50% duty cycle), TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
Input Leakage Current On-/off-leakage, VIN = 0 or V
Input Capacitance (Note 6) 18 pF
TEMPERATURE MEASUREMENTS
Internal Sensor Measurement Error
(Note 7)
External Sensor Measurement
Error (Note 8)
Temperature Measurement Noise
Temperature Resolution 0.125 °C/LSB
External Sensor Bias Current
Power-Supply Rejection PSR
INTERNAL REFERENCE
REF Output Voltage V
REF Temperature Coefficient TC
REF Output Resistance 7kΩ
REF Output Noise
REF Power-Supply Rejection Ratio PSRR
EXTERNAL REFERENCE
REF Input Voltage Range V
REF Input Current I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Grade A
MAX1253
MAX1254
Grade B
MAX1253
Grade B
MAX1254
Differential
Single ended
Differentially configured inputs and internal
sensor
Single-ended configured, external sensor 0.1
Low 4
High 66
Differentially configured inputs and internal
sensor
Single-ended configured, external sensor 0.1
MAX1253 2.456 2.500 2.544
REF
MAX1254 4.024 4.096 4.168
Grade A ±8
REF
Grade B ±30
MAX1253 200
MAX1254 160
MAX1253 -70 -50
MAX1254 -70 -50
REF
V
= +2.5V; f
REF
REF
In power-down ±1
SAMPLE
DD
TA = -20°C to +85°C ±0.5 ±1.0
TA = -40°C to +85°C ±0.75 ±1.5
= +25°C ±0.3
T
A
TA = -40°C to +85°C ±1.2 ±2.5
T
= +25°C ±0.7
A
TA = -40°C to +85°C ±1.2 ±3.0
= +25°C ±0.7
T
A
TA = -40°C to +85°C±2
= +25°C±1
T
A
TA = -40°C to +85°C±5
T
= +25°C±2
A
= 94ksps 15 40
±1 µA
0.3
0.3
p p m /°C
µV
1.0 VDD + 0.05 V
°C
°C
°C
µA
°C/V
V
RMS
dB
µA
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD= +2.7V to +3.6V (MAX1253), VDD= +4.5V to +5.5V (MAX1254), V
REF
= +2.5V (MAX1253), V
REF
= +4.096V (MAX1254), f
SCLK
= 10MHz (50% duty cycle), TA= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at TA= +25°C.)
DIGITAL INPUTS
Input Voltage Low V
Input Voltage High V
Input Hysteresis V
Input Leakage Current I
Input Capacitance C
DIGITAL OUTPUTS
Output Voltage Low V
Output Voltage High V
Tri-State Leakage Current I
Tri-State Output Capacitance C
POWER REQUIREMENTS
Positive Supply Voltage V
Supply Current I
Full Power-Down Supply Current I
Power-Supply Rejection Ratio PSRR Analog inputs at full scale (Note 12) ±0.4 ±1.6 mV/V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
(SCLK, DIN, CS)
(INT, DOUT)
IL
IH
HYST
IN
IN
OL
OH
L
OUT
DD
DD
SHDN
VIN = 0 or V
I
SINK
I
SINK
I
SOURCE
I
SOURCE
CS = V
CS = V
MAX1253 2.7 3.6
MAX1254 4.5 5.5
MAX1253 internal reference (Note 9) 3.3
MAX1253 internal reference (Note 10) 2.9
MAX1253 external reference (Note 10) 2.2
MAX1254 internal reference (Note 9) 5.0
MAX1254 internal reference (Note 10) 4.0
MAX1254 external reference (Note 10) 3.0
Both internal reference, mode 01 (Note 11) 8 µA
Full power-down state
DD
= 8mA, DOUT 0.5
= 2mA, INT 0.5
= 8mA, DOUT VDD - 0.5
= 2mA, INT VDD - 0.5
DD
DD
VDD x 0.7 V
MAX1253 480
MAX1254 860
200 mV
VDD x 0.3 V
±10 µA
2pF
±10 µA
5pF
V
V
V
mA
nA
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
_______________________________________________________________________________________ 5
Note 1: Relative accuracy is the deviation of the analog value at any code from its theoretical value after the gain and offset errors
have been calibrated.
Note 2: Offset nulled.
Note 3: In reference mode 00, the reference system powers up for each temperature measurement. In reference mode 01, the ref-
erence system powers up once per sequence of channels scanned. If a sample wait <80µs is programmed, the reference
system is on all the time. In reference mode 10, the reference system is on all the time (see Table 7).
Note 4: No external capacitor on REF.
Note 5: The operational input voltage range for each individual input of a differentially configured pair (AIN0–AIN7) is from GND to
V
DD
.
The operational input voltage difference is from -V
REF
/2 to +V
REF
/2.
Note 6: See Figure 3 and the Sampling Error vs. Input Source Impedance graph in the Typical Operating Characteristics section.
Note 7: Grade A tested at +10°C and +55°C. -20°C to +85°C and -40°C to +85°C specifications guaranteed by design. Grade B
tested at +25°C. T
MIN
to T
MAX
specification guaranteed by design.
Note 8: External temperature measurement mode using an MMBT3904 (Diodes Inc.) as a sensor. External temperature sensing
from -40°C to +85°C; MAX1253/MAX1254 held at +25°C.
Note 9: Performing eight single-ended external channels’ temperature measurements, an internal temperature measurement, and
an internal V
DD
measurement with no sample wait results in a conversion rate of 2ksps per channel.
Note 10: Performing eight single-ended voltage measurements, an internal temperature measurement, and an internal V
DD
measure-
ment with no sample wait results in a conversion rate of 7ksps per channel.
Note 11: Performing eight single-ended voltage measurements, an internal temperature measurement, and an internal V
DD
measure-
ment with maximum sample wait results in a conversion rate of 3ksps per channel.
Note 12: Defined as the shift in the code boundary as a result of supply voltage change. V
DD
= min to max; full-scale input, mea-
sured using external reference.
TIMING CHARACTERISTICS
(VDD= +2.7V to +3.6V (MAX1253), VDD= +4.5V to +5.5V (MAX1254), TA= T
MIN
to T
MAX
, unless otherwise noted.) (Figures 1, 2, and 4)
SCLK Clock Period t
SCLK Pulse Width High Time t
SCLK Pulse Width Low Time t
DIN to SCLK Setup Time t
DIN to SCLK Hold Time t
CS Fall to SCLK Rise Setup t
SCLK Rise to CS Rise Hold t
SCLK Fall to DOUT Valid t
CS Rise to DOUT Disable t
CS Fall to DOUT Enable t
CS Pulse Width High t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CP
CH
CL
DS
DH
CSS
CSH
DOV
DOD
DOE
CSW
CL = 30pF 50 ns
CL = 30pF 40 ns
CL = 30pF 40 ns
100 0.5 ns
45 ns
45 ns
25 ns
0ns
25 ns
50 ns
40 ns
SUPPLY CURRENT
vs. SAMPLE RATE
MAX1253/54 toc07
SAMPLE RATE (kHz)
SUPPLY CURRENT (mA)
1010.10.01
0.01
0.1
1
10
0.001
0.001 100
INTERNAL REFERENCE
(MODE 01) MAX1254
9 TEMPERATURE
CHANNELS AND 1
VOLTAGE CHANNEL
9 VOLTAGE
CHANNELS AND
1 TEMPERATURE
CHANNEL
1 VOLTAGE CHANNEL
(V
DD
/2)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1253/54 toc08
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.14.73.1 3.5 3.9 4.3
1.4
1.8
2.2
2.6
3.0
3.4
3.8
4.2
1.0
2.7 5.5
EXTERNAL REFERENCE (MODE 00)
9 VOLTAGE CHANNELS AND
1 TEMPERATURE CHANNEL
1 VOLTAGE CHANNEL
(V
DD
/2)
9 TEMPERATURE CHANNELS
AND 1 VOLTAGE CHANNEL
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1253/54 toc05
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
6040200-20
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
2.508
2.510
2.490
-40 80
GRADE A
GRADE B
MAX1253
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1253/54 toc05b
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)
6040200-20
4.0725
4.0750
4.0775
4.0800
4.0825
4.0850
4.0875
4.0900
4.0700
-40 80
GRADE A
MAX1254
GRADE B
SUPPLY CURRENT
vs. SAMPLE RATE
MAX1253/54 toc06
SAMPLE RATE (kHz)
SUPPLY CURRENT (mA)
1010.10.01
0.01
0.1
1
10
0.001
0.001 100
INTERNAL REFERENCE
(MODE 01) MAX1253
9 TEMPERATURE
CHANNELS AND 1
VOLTAGE CHANNEL
(V
DD
/2)
9 VOLTAGE
CHANNELS AND
1 TEMPERATURE
CHANNEL
1 VOLTAGE CHANNEL
(V
DD
/2)
INTERNAL REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX1253/54 toc04
SUPPLY VOLTAGE (V)
INTERNAL REFERENCE VOLTAGE (V)
5.45.35.1 5.24.7 4.8 4.9 5.04.6
4.077
4.079
4.081
4.083
4.085
4.075
4.5 5.5
MAX1254
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
6 _______________________________________________________________________________________
Typical Operating Characteristics
(VDD= +3V, V
REF
= 2.5V (MAX1253); VDD= 5V, V
REF
= 4.096V (MAX1254); f
SCLK
= 10MHz, C
REF
= 0.1µF, TA= +25°C, unless oth-
erwise noted.)
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1253/54 toc01
OUTPUT CODE
INL (LSB)
307220481024
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
0 4096
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE
MAX1253/54 toc02
OUTPUT CODE
DNL (LSB)
307220481024
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
0 4096
INTERNAL REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
MAX1253/54 toc03
SUPPLY VOLTAGE (V)
INTERNAL REFERENCE VOLTAGE (V)
3.53.43.2 3.32.9 3.0 3.12.8
2.501
2.502
2.503
2.504
2.505
2.506
2.507
2.508
2.509
2.510
2.500
2.7 3.6
MAX1253
GAIN ERROR vs. TEMPERATURE
MAX1253/54 toc15
TEMPERATURE (°C)
GAIN ERROR (LSB)
80655035205-10-25
0.10
0
0.20
0.40
0.30
0.60
0.50
0.70
0.90
0.80
1.00
-0.10
-40
UNIPOLAR
DIFFERENTIAL
CONFIGURATION
EXTERNAL
REFERENCE MODE
BIPOLAR DIFFERENTIAL
CONFIGURATION
EXTERNAL REFERENCE
MODE
UNIPOLAR SINGLE-ENDED
CONFIGURATION
EXTERNAL REFERENCE MODE
OFFSET ERROR vs. TEMPERATURE
MAX1253/54 toc16
TEMPERATURE (°C)
OFFSET ERROR (LSB)
80655035205-10-25
-0.80
-0.60
-0.40
-0.20
0
0.20
0.40
-1.00
-40
UNIPOLAR
DIFFERENTIAL
CONFIGURATION
EXTERNAL
REFERENCE MODE
BIPOLAR DIFFERENTIAL
CONFIGURATION
EXTERNAL REFERENCE
MODE
UNIPOLAR SINGLE-ENDED
CONFIGURATION
EXTERNAL REFERENCE
MODE
INTERNAL TEMPERATURE SENSOR
TEMPERATURE ERROR
MAX1253/54 toc17
TEMPERATURE (°C)
ERROR (°C)
6040200-20
-0.80
-0.60
-0.40
-0.20
0
0.20
0.40
0.60
0.80
1.00
-1.00
-40 80
MAX1253/MAX1254
GRADE A INTERNAL
SENSOR
GRADE B INTERNAL
SENSOR
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(VDD= +3V, V
REF
= 2.5V (MAX1253); VDD= 5V, V
REF
= 4.096V (MAX1254); f
SCLK
= 10MHz, C
REF
= 0.1µF, TA= +25°C, unless oth-
erwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1253/54 toc09
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
5.14.73.1 3.5 3.9 4.3
1.9
2.3
2.7
3.1
3.5
3.9
4.3
1.5
2.7 5.5
INTERNAL REFERENCE (MODE 01)
9 TEMPERATURE CHANNELS
AND VOLTAGE CHANNEL (V
DD
/2)
9 VOLTAGE
CHANNELS AND
1 TEMPERATURE
CHANNEL
1 VOLTAGE
CHANNEL (V
DD
/2)
SUPPLY CURRENT
vs. TEMPERATURE
MAX1253/54 toc10
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
806535 50-10 5 20-25
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
1.6
-40
9 TEMPERATURE CHANNELS AND
1 VOLTAGE CHANNEL (V
DD
/2)
9 VOLTAGE CHANNELS AND
1 TEMPERATURE CHANNEL
1 VOLTAGE CHANNEL (VDD/2)
INTERNAL REFERENCE (MODE 01) MAX1253
SUPPLY CURRENT
vs. TEMPERATURE
MAX1253/54 toc11
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
806535 50-10 5 20-25
2.5
3.0
4.0
3.5
4.5
5.0
2.0
-40
9 TEMPERATURE CHANNELS AND
1 VOLTAGE CHANNEL (V
DD
/2)
9 VOLTAGE CHANNELS AND
1 TEMPERATURE CHANNEL
1 VOLTAGE CHANNEL (VDD/2)
INTERNAL REFERENCE (MODE 01) MAX1254
SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX1253/54 toc12
SUPPLY VOLTAGE (V)
SHUTDOWN SUPPLY CURRENT (nA)
5.14.74.33.93.53.1
200
300
400
500
600
700
100
2.7 5.5
MAX1253
MAX1254
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1253/54 toc13
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
655035205-10-25
100
200
300
400
500
600
700
0
-40 80
MAX1254
V
DD
= 5V
MAX1253
V
DD
= 3V
GAIN AND OFFSET ERROR
vs. SUPPLY VOLTAGE
MAX1253/54 toc14
SUPPLY VOLTAGE (V)
GAIN AND OFFSET ERROR (LSB)
5.14.73.9 4.33.53.1
-0.80
-0.60
-0.40
-0.20
0
0.20
0.40
0.60
0.80
1.00
-1.00
2.7 5.5
SINGLE ENDED
MAX1253
MAX1254
OFFSET ERROR
GAIN ERROR
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VDD= +3V, V
REF
= 2.5V (MAX1253); VDD= 5V, V
REF
= 4.096V (MAX1254); f
SCLK
= 10MHz, C
REF
= 0.1µF, TA= +25°C, unless oth-
erwise noted.)
EXTERNAL TEMPERATURE SENSOR
TEMPERATURE ERROR
2.0
MAX1253/MAX1254
1.6
1.2
0.8
0.4
0
ERROR (°C)
-0.4
-0.8
-1.2
EXTERNAL SENSOR,
SINGLE-ENDED INPUT
-1.6
-2.0
-40 80
EXTERNAL SENSOR,
DIFFERENTIAL INPUT
TEMPERATURE (°C)
SAMPLING ERROR
vs. INPUT SOURCE IMPEDANCE
1
0
-1
MAX1253/54 toc18
6040200-20
MAX1253/54 toc20
TEMPERATURE ERROR vs. INTERCONNECT
CAPACITANCE (EXTERNAL SENSOR)
1
0
-1
-2
-3
TEMPERATURE (°C)
-4
EXTERNAL DIODE
DIFFERENTIAL TEMPERATURE
-5
MEASUREMENT MODE
-6
1
10 100
INTERCONNECT CAPACITANCE (pF)
TURN ON THERMAL TRANSIENT,
CONTINUOUS CONVERSION
V
0.625
IN A TSSOP SOCKET
0.500
0.375
DD
SOLDER ON A 2in ✕ 2in PWB
MAX1253/54 toc19
1000
= 3.0V
MAX1253/54 toc21
-2
-3
SAMPLING ERROR (LSB)
-4
-5
10 10,000
SOURCE IMPEDANCE (Ω)
1000100
0.250
0.125
TEMPERATURE SHIFT (°C)
0
-0.125
030
IN AN OIL BATH
EXTERNAL BJT
252015105
TIME (s)
MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
_______________________________________________________________________________________ 9
Pin Description
PIN
NAME
FUNCTION
1
Analog Voltage Input/Temperature Input Channel 0 or Positive Differential Input Relative to AIN1
2
Analog Voltage Input/Temperature Input Channel 1 or Negative Differential Input Relative to AIN0
3
Analog Voltage Input/Temperature Input Channel 2 or Positive Differential Input Relative to AIN3
4
Analog Voltage Input/Temperature Input Channel 3 or Negative Differential Input Relative to AIN2
5
Analog Voltage Input/Temperature Input Channel 4 or Positive Differential Input Relative to AIN5
6
Analog Voltage Input/Temperature Input Channel 5 or Negative Differential Input Relative to AIN4
7
Analog Voltage Input/Temperature Input Channel 6 or Positive Differential Input Relative to AIN7
8
Analog Voltage Input/Temperature Input Channel 7 or Negative Differential Input Relative to AIN6
9
Positive Reference Input in External Mode. Bypass REF with a 0.1µF capacitor to GND when in external mode.
When using the internal reference, REF must be left open.
10
Interrupt Output. Push-pull or open drain with selectable polarity. See Table 9 and the INT Interrupt Output section.
11
Serial Data Output. DOUT transitions on the falling edge of SCLK. High impedance when CS is at logic high.
12
Ground
13
Positive Power Supply. Bypass with a 0.1µF capacitor to GND.
14
Serial Data Input. DIN data is latched into the serial interface on the rising edge of the SCLK.
15
Serial Clock Input. Clocks data in and out of the serial interface (duty cycle must be 40% to 60%).
16
Active-Low Chip-Select Input. When CS is low, the serial interface is enabled. When CS is high, DOUT is high
impedance, and the serial interface resets.
Block Diagram
V
DD
REFERENCE
INPUT CHANNEL REGISTER
INPUT CONFIGURATION REGISTER
STEP-UP REGISTER
ALARM REGISTER
AIN3
ACCUMULATOR
THRESHOLD
THRESHOLD
CHANNEL
CONFIGURATION
ACCUMULATOR
UPPER
LOWER
CONFIGURATION
AVERAGING
AIN4
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
AIN5
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
MAX1253
MAX1254
AIN6
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
INTERNAL TEMP
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
TEMP
SENSOR
MUX
/2
V
DD
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
ADC WITH
CONVERSION
CONTROL
AIN0
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
12-BIT
T/H
SCAN
AND
POR
ACCUMULATOR
THRESHOLD
THRESHOLD
CHANNEL
CONFIGURATION
AIN1
UPPER
LOWER
POWER-
GOOD
AIN2
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
REF
DOUT
SERIAL
INTERFACE
DIGITAL
COMPARATOR
AIN7
ACCUMULATOR
UPPER
THRESHOLD
LOWER
THRESHOLD
CHANNEL
CONFIGURATION
DIN
SCLK
CS
INT
AIN0
AIN1
AIN2
AIN3
AIN4
AIN5
AIN6
AIN7
REF
INT
DOUT
GND
V
DD
DIN
SCLK
CS
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