MAX7500/MAX7501/MAX7502
Digital Temperature Sensors and Thermal
Watchdog with Bus Lockup Protection
4 _______________________________________________________________________________________
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX7500 toc01
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (µA)
9565355-25
240
250
260
270
280
290
300
230
-55 125
+V
S
= +5V
+V
S
= +3V
SHUTDOWN SUPPLY CURRENT (µA)
1
2
3
4
5
6
0
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX7500 toc02
TEMPERATURE (°C)
9565355-25-55 125
+V
S
= +5V
+V
S
= +3V
ACCURACY vs. TEMPERATURE
ACCURACY (°C)
-1.5
-1.0
-0.5
0
0.5
1.0
1.5
2.0
-2.0
MAX7500 toc03
TEMPERATURE (°C)
9565355-25-55 125
4 TYPICAL PARTS
MAX7500
MAX7502
NAME FUNCTION
11SDA Serial Data Input/Output Line. Open drain. Connect SDA to a pullup resistor.
22SCL Serial Data Clock Input. Open drain. Connect SCL to a pullup resistor.
33OS Over-Temperature Shutdown Output. Open drain. Connect OS to a pullup resistor.
44GND Ground
5—A2
2-Wire Interface Address Input. Connect A2 to GND or +V
S
to set the desired I
2
C bus
address. Do not leave floating. (See Table 1.)
—5RESET
Active-Low Reset Input. Pull RESET low for longer than the minimum reset pulse width
to reset the I
2
C bus and all internal registers to their POR values.
66A1
2-Wire Interface Address Input. Connect A1 to GND or +V
S
to set the desired I
2
C bus
address. Do not leave floating. (See Table 1.)
77A0
2-Wire Interface Address Input. Connect A0 to GND or +V
S
to set the desired I
2
C bus
address. Do not leave floating. (See Table 1.)
88+V
S
Positive Supply Voltage Input. Bypass to GND with a 0.1µF bypass capacitor.
Detailed Description
The MAX7500/MAX7501/MAX7502 temperature sen-
sors measure temperature, convert the data into digital
form using a sigma-delta ADC, and communicate the
conversion results through an I
2
C-compatible 2-wire
serial interface. These devices accept standard I
2
C
commands to read the data, set the over-temperature
alarm (OS) trip thresholds, and configure other charac-
teristics. The MAX7500 features three address select
lines (A0, A1, A2) while the MAX7501 and MAX7502
feature two address select lines (A0, A1) and a RESET
input. The MAX7500/MAX7501/MAX7502 operate from
+3.0V to +5.5V supply voltages of and consume 250µA
of supply current.
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