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PDF MAX6519UK Data sheet ( Hoja de datos )
| Número de pieza | MAX6519UK | |
| Descripción | Low-Cost / 2.7V to 5.5V / Analog Temperature Sensor Switches in a SOT23 | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-3007; Rev 0; 11/03
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
General Description
The MAX6516–MAX6519 low-cost, fully integrated tem-
perature switches assert a logic signal when their die
temperature crosses a factory-programmed threshold.
Operating from a 2.7V to 5.5V supply, these devices
feature a fixed voltage reference, an analog tempera-
ture sensor, and a comparator. They are available with
factory-trimmed temperature trip thresholds from -45°C
to +115°C in 10°C increments, and are accurate to
±0.5°C (typ). These devices require no external compo-
nents and typically consume 22µA of supply current.
Hysteresis is pin selectable at 2°C or 10°C.
The MAX6516–MAX6519 are offered with hot-tempera-
ture thresholds (+35°C to +115°C), asserting when the
temperature is above the threshold, or with cold-tem-
perature thresholds (-45°C to +15°C), asserting when
the temperature is below the threshold.
These devices provide an analog output proportional to
temperature and are stable with any capacitive load up
to 1000pF. The MAX6516–MAX6519 can be used over a
range of -35°C to +125°C with a supply voltage of 2.7V
to 5.5V. For applications sensing temperature down to
-45°C, a supply voltage above 4.5V is required.
The MAX6516 and MAX6518 have an active-high,
push-pull output. The MAX6517 and MAX6519 have an
active-low, open-drain output. These devices are avail-
able in a space-saving 5-pin SOT23 package and oper-
ate over the -55°C to +125°C temperature range.
Applications
Fan Control
Test Equipment
Temperature Control
Temperature Alarms
Over/Undertemperature
Protection
Notebook, Desktop PCs
RAID
Servers
Typical Operating Circuit
VCC
0.1µF
100kΩ
VCC TOVER
MAX6517
OUT
GND HYST
VCC
INT
MICROCONTROLLER
ADC IN
GND
Features
o High Accuracy ±1.5°C (max) Over -15°C to +65°C
Temperature Range
o Low Power Consumption—22µA Typical Current
o Factory-Programmed Thresholds from -45°C to
+115°C in 10°C Increments
o Analog Output to Allow Board-Level Testing
o Open-Drain or Push-Pull Outputs
o Pin-Selectable 2°C or 10°C Hysteresis
o Low Cost
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX6516UK_ _ _ _-T -55°C to +125°C 5 SOT23-5
MAX6517UK_ _ _ _-T -55°C to +125°C 5 SOT23-5
MAX6518UK_ _ _ _-T -55°C to +125°C 5 SOT23-5
MAX6519UK_ _ _ _-T -55°C to +125°C 5 SOT23-5
*These parts are offered in 16 standard temperature versions
with a minimum order of 2500 pieces. To complete the suffix
information, add P or N for positive or negative trip temperature,
and select an available trip point in degrees centigrade. For
example, the MAX6516UKP065-T describes a MAX6516 in a
5-pin SOT23 package with a +65°C threshold. Contact the facto-
ry for pricing and availability.
Functional Diagram appears at end of data sheet.
Pin Configurations
TOP VIEW
OUT 1
(TOVER)
5 TOVER
(MAX6516)
GND 2 MAX6517
OUT 1
(TUNDER)
5 TUNDER
(MAX6516)
GND 2 MAX6517
HYST 3
4 VCC
SOT23
HYST 3
4 VCC
SOT23
HYST 1
(TOVER)
5 TOVER
(MAX6518)
GND 2 MAX6519
HYST 1
(TUNDER)
5 TUNDER
(MAX6518)
GND 2 MAX6519
OUT 3
4 VCC
SOT23
OUT 3
4 VCC
SOT23
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Low-Cost, 2.7V to 5.5V, Analog Temperature
Sensor Switches in a SOT23
Detailed Description
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.
Analog Output
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:
VOUT = 1.8015 - 10.62mV (T - 30) + 1.1µV (T - 30)2
where T = temperature in °C.
In most cases, a linear approximation can be applied:
VOUT = 1.8015 - 10.62mV (T - 30)
Therefore,
T = 1.8015 − VOUT + 30°C
0.01062
Hysteresis Input
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
VCC for 2°C hysteresis or to GND for 10°C hysteresis.
Logic Temperature Indicators
Overtemperature Indicator (Hot Thresholds)
TOVER and TOVER designations apply to thresholds
above TA = +25°C (+35°C, +45°C, +55°C, +65°C, +75°C,
+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.
Undertemperature Indicator (Cold Thresholds)
TUNDER and TUNDER designations apply to thresholds
below TA = +25°C (+15°C, +5°C, -5°C, -15°C, -25°C,
-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.
Applications Information
Temperature-Window Alarm
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.
_______________________________________________________________________________________ 5
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