MAX6516UKP075+T Maxim Integrated Products, MAX6516UKP075+T Datasheet - Page 5

• Manufacturer Part Number: MAX6516UKP075+T
• Description: Board Mount Temperature Sensors 2.7V to 5.5V Temperature Switch
• Manufacturer: Maxim Integrated Products

Specifications of MAX6516UKP075+T

• Temperature Threshold: + 75 C
• Full Temp Accuracy: +/- 3 C
• Package / Case: SOT-23
• Gain: - 10.62 mV / C
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Output Type: Analog
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

The MAX6516–MAX6519 fully integrated temperature
switches incorporate a fixed reference, an analog tem-
perature sensor, and a comparator. The temperature at
which the two reference voltages are equal determines
the temperature trip point. OUT is an analog voltage
that varies with the die’s temperature. Pin-selectable
2°C or 10°C hysteresis keeps the digital output from
oscillating when the die temperature approaches the
threshold temperature. The MAX6516 and MAX6518
have an active-high, push-pull output structure that can
sink or source current. The MAX6517 and MAX6519
have an active-low, open-drain output structure that
can only sink current. The internal power-on reset cir-
cuit guarantees the logic output is at its +25°C state for
at least 50µs.
OUT is an analog output that is proportional to the die
temperature. OUT voltage range is between 0.77V to
2.59V, within the temperature range of -45°C to
+125°C. For applications with a switching threshold of
-45°C, the supply voltage must be greater than 4.5V.
The temperature-to-voltage transfer function is approxi-
mately linear and can be described by the quadratic
equation:
where T = temperature in °C.
In most cases, a linear approximation can be applied:
Therefore,
The HYST input selects the devices’ temperature hys-
teresis and prevents the output from oscillating when the
temperature approaches the trip point. Connect HYST to
V
CC
V
OUT
for 2°C hysteresis or to GND for 10°C hysteresis.
= 1.8015 - 10.62mV (T - 30) + 1.1µV (T - 30)
Low-Cost, 2.7V to 5.5V, Analog Temperature
V
OUT
T
=
= 1.8015 - 10.62mV (T - 30)
_______________________________________________________________________________________
1 8015
.
0 01062
Detailed Description
.
−
V
OUT
+
Hysteresis Input
30
Analog Output
°
C
Sensor Switches in a SOT23
2
TOVER and TOVER designations apply to thresholds
above T
+85°C, +95°C, +105°C, +115°C). All “hot” thresholds are
positive temperatures.
The overtemperature indicator output is open-drain
active low (TOVER) or push-pull active high (TOVER).
TOVER goes low when the die temperature exceeds
the factory-programmed temperature threshold. TOVER
should be pulled up to a voltage no greater than 5.5V
with a 100kΩ pullup resistor. TOVER is a push-pull
active-high CMOS output that goes high when the die
temperature exceeds the factory-programmed temper-
ature threshold.
TUNDER and TUNDER designations apply to thresholds
below T
-35°C, -45°C). The undertemperature indicator output is
open drain, active low (TUNDER), or push-pull active
high (TUNDER). TUNDER goes low when the die tem-
perature goes below the factory-programmed tempera-
ture threshold. TUNDER should be pulled up to a
voltage no greater than 5.5V with a 100kΩ pullup resis-
tor. TUNDER is a push-pull active-high CMOS output
that goes high when the die temperature falls below the
factory-programmed temperature threshold.
The MAX6516/MAX6518 logic outputs assert when the
die temperature is outside the factory-programmed
range. Combining the outputs of two devices creates
an over/undertemperature alarm. Two MAX6516s or
two MAX6518s are used to form two complementary
pairs, containing one cold trip-point output and one hot
trip-point output. The assertion of either output alerts
the system to an out-of-range temperature. The
MAX6516 push-pull output stages can be ORed to
produce a thermal out-of-range alarm (Figure 1).
More favorably, two MAX6517s or two MAX6519s can
be directly wire-ORed with a single external resistor to
accomplish the same task. The temperature window
alarms shown in Figure 2 can be used to accurately
determine when a device’s temperature falls out of the
-5°C to +75°C range. The thermal overrange signal can
be used to assert a thermal shutdown, power-up,
recalibration, or other temperature-dependent function.
Undertemperature Indicator (Cold Thresholds)
A
A
Overtemperature Indicator (Hot Thresholds)
= +25°C (+35°C, +45°C, +55°C, +65°C, +75°C,
= +25°C (+15°C, +5°C, -5°C, -15°C, -25°C,
Applications Information
Logic Temperature Indicators
Temperature-Window Alarm
5