Datasheet
MAX7500–MAX7504
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
Pin Description
PIN
MAX7500
MAX7501–
MAX7504
NAME FUNCTION
1 1 SDA Serial Data Input/Output Line. Open drain. Connect SDA to a pullup resistor.
2 2 SCL Serial Data Clock Input. Open drain. Connect SCL to a pullup resistor.
3 3 OS Overtemperature Shutdown Output. Open drain. Connect OS to a pullup resistor.
4 4 GND 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 unconnected (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 unconnected (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 unconnected (see Table 1).
88+V
S
Positive Supply Voltage Input. Bypass to GND with a 0.1µF bypass capacitor.
Detailed Description
The MAX7500–MAX7504 temperature sensors 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 inter-
face. These devices accept standard I
2
C commands to
read the data, set the overtemperature alarm (OS) trip
thresholds, and configure other characteristics. The
MAX7500 features three address select lines (A0, A1,
A2) while the MAX7501–MAX7504 feature two address
select lines (A0, A1) and a RESET input. The
MAX7500–MAX7504 operate from +3.0V to +5.5V sup-
ply voltages and consume 250µA of supply current.