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PDF MAX1153 Data sheet ( Hoja de datos )
| Número de pieza | MAX1153 | |
| Descripción | 10-Bit System Monitors | |
| Fabricantes | Maxim Integrated | |
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19-2839; Rev 1; 6/10
Stand-Alone, 10-Channel, 10-Bit System Monitors
with Internal Temperature Sensor and VDD Monitor
General Description
The MAX1153/MAX1154 are stand-alone, 10-channel (8
external, 2 internal) 10-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 MAX1153/MAX1154
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 MAX1153 consumes only
5mW (1.7mA at 3V). AutoShutdownTM 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 MAX1153/
MAX1154 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
♦ 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
10-Bit Resolution
±0.5 LSB INL, ±0.5 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
(MAX1153/MAX1154)
♦ 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
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1153BEUE+ -40°C to +85°C 16 TSSOP
MAX1154BEUE+ -40°C to +85°C 16 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Selector Guide
Pin Configuration
PART
MAX1153BEUE+
MAX1154BEUE+
INL (LSB)
TEMP
SUPPLY
ERROR (°C) VOLTAGE (V)
±0.5
±3.0
2.7 to 3.6
±0.5
±2.5
4.5 to 5.5
TOP VIEW
+
AIN0 1
AIN1 2
AIN2 3
AIN3 4
AIN4 5
MAX1153
MAX1154
AIN5 6
AIN6 7
AIN7 8
16 CS
15 SCLK
14 DIN
13 VDD
12 GND
11 DOUT
10 INT
9 REF
Typical Application Circuit appears at end of data sheet.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
TSSOP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
Stand-Alone, 10-Channel, 10-Bit System Monitors
with Internal Temperature Sensor and VDD Monitor
TIMING CHARACTERISTICS
(VDD = +2.7V to +3.6V (MAX1153), VDD = +4.5V to +5.5V (MAX1154), TA = TMIN to TMAX, unless otherwise noted.) (Note 1) (Figures 1,
2, and 4)
PARAMETER
SCLK Clock Period
SCLK Pulse Width High Time
SCLK Pulse Width Low Time
DIN to SCLK Setup Time
DIN to SCLK Hold Time
CS Fall to SCLK Rise Setup
SCLK Rise to CS Rise Hold
SCLK Fall to DOUT Valid
CS Rise to DOUT Disable
CS Fall to DOUT Enable
CS Pulse Width High
SYMBOL
tCP
tCH
tCL
tDS
tDH
tCSS
tCSH
tDOV CL = 30pF
tDOD CL = 30pF
tDOE CL = 30pF
tCSW
CONDITIONS
MIN TYP MAX UNITS
100 ns
45 ns
45 ns
25 ns
0 ns
25 ns
50 ns
50 ns
40 ns
40 ns
50 ns
Note 1: The devices are 100% tested at TA = +25°C and +85°C. Specification over temperature range is guaranteed by design.
Note 2: 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 3: Offset nulled.
Note 4: 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 5: No external capacitor on REF.
Note 6: The operational input voltage range for each individual input of a differentially configured pair (AIN0–AIN7) is from GND to
VDD. The operational input voltage difference is from -VREF/2 to +VREF/2.
Note 7: See Figure 3 and the Sampling Error vs. Input Source Impedance graph in the Typical Operating Characteristics section.
Note 8: 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. TMIN to TMAX specification guaranteed by design.
Note 9: External temperature measurement mode using an MMBT3904 (Diodes Inc.) as a sensor. External temperature sensing
from -40°C to +85°C; MAX1153/MAX1154 held at +25°C.
Note 10: Performing eight single-ended external channels’ temperature measurements, an internal temperature measurement, and
an internal VDD measurement with no sample wait results in a conversion rate of 2ksps per channel.
Note 11: Performing eight single-ended voltage measurements, an internal temperature measurement, and an internal VDD mea-
surement with no sample wait results in a conversion rate of 7ksps per channel.
Note 12: Performing eight single-ended voltage measurements, an internal temperature measurement, and an internal VDD mea-
surement with maximum sample wait results in a conversion rate of 3ksps per channel.
Note 13: Defined as the shift in the code boundary as a result of supply voltage change. VDD = min to max; full-scale input, mea-
sured using external reference.
_______________________________________________________________________________________ 5
5 Page 
Stand-Alone, 10-Channel, 10-Bit System Monitors
with Internal Temperature Sensor and VDD Monitor
VDD
INPUT REGISTERS 0–10
AIN 0 CURRENT DATA
AIN 1
UPPER THRESHOLD
LOWER THRESHOLD
AIN 2
# FAULT CYCLES
AVERAGE
AIN 3
MUX
12-BIT
ADC WITH T/H
DIGITAL
COMPARATOR
INT
AIN 4
CONFIGURATION/
STATUS
REGISTERS
AIN 5
AIN 6
SCAN AND
CONVERSION
CONTROL
AIN 7
TEMP
SENSE
SERIAL
INTERFACE
DIN
DOUT
SCLK
CS
Figure 3. Simplified Alarm Block Diagram of the MAX1153/MAX1154
During the acquisition interval, IN+ and IN- charge both
a positive (CHOLDP) and a negative (CHOLDN) sam-
pling capacitor. After completing the acquisition inter-
val, the T/H switches open, storing an accurate sample
of the differential voltage between IN+ and IN-. This
charge is then transferred to the ADC and converted.
Finally, the conversion result is transferred to the cur-
rent data register.
Temperature conversions require 46µs (typ) and mea-
sure the difference between two sequential voltage
measurements (see the Temperature Measurement
section for a detailed description).
Fully Differential Track/Hold (T/H)
The T/H acquisition interval begins with the rising edge
of CS (for manually triggered conversions) and is inter-
nally timed to 1.5µs (typ). The accuracy of the input sig-
nal sample is a function of the input signal’s source
impedance and the T/H’s capacitance. In order to
achieve adequate settling of the T/H, limit the signal
source impedance to a maximum of 1kΩ.
Input Bandwidth
The ADC’s input tracking circuitry has a 1MHz small-
signal bandwidth. To avoid high-frequency signals
aliasing into the frequency band of interest, anti-alias
prefiltering of the input signals is recommended.
Analog Input Protection
Internal protection diodes, which clamp the analog
inputs to VDD and GND, allow the channel input pins to
swing from (VGND - 0.3V) to (VDD + 0.3V) without dam-
age. However, for accurate conversions near full scale,
the inputs must not exceed VDD by more than 50mV or
be lower than VGND by 50mV. If the analog input range
must exceed 50mV beyond the supplies, limit the input
current.
Single Ended/Differential
The MAX1153/MAX1154 use a fully differential ADC for
all conversions. Through the input configuration regis-
ter, the analog inputs can be configured for either dif-
ferential or single-ended conversions. When sampling
signal sources close to the MAX1153/MAX1154, single-
ended conversion is generally sufficient. Single-ended
conversions use only one analog input per signal
source, internally referenced to GND.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1153.PDF ] | |
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