Rainbow Electronics MAX6515 - Manual (Page 4)

MAX6514/MAX6515
Low-Cost, 2.7V to 5.5V Temperature Switches
in a SOT23
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Pin Description
Detailed Description
The MAX6514/MAX6515 fully integrated temperature
switches incorporate a fixed reference, an analog tem-
perature sensor, and a comparator. Pin-selectable 2°C
or 10°C hysteresis keeps the digital output from oscil-
lating when the die temperature approaches the
threshold temperature. The MAX6514 has an active-
high, push-pull output structure that can sink or source
current. The MAX6515 has an active-low, open-drain
output structure that can only sink current. The internal
power-on reset circuit guarantees the logic output is at
its +25°C state for at least 50µs.
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
V
CC 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 T
A
= +25°C (+35°C, +45°C, +55°C, +65°C,
+75°C, +85°C, +95°C, +105°C, and +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 thresh-
olds below T
A = +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
temperature goes below the factory-programmed tem-
perature 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.
PIN
MAX6514 MAX6515
NAME FUNCTION
1, 2 1, 2 GND Ground
3 3 HYST Hysteresis Input. Connect to V CC for 2°C of hysteresis or to GND for 10°C hysteresis.
4 4 V CC Input Supply. Bypass to ground with a 0.1µF capacitor.
5 — TOVER
Push-Pull Active-High Output (Hot Threshold). TOVER goes high when the die temperature
exceeds the factory-programmed hot-temperature threshold.
— 5 TOVER
Open-Drain, Active-Low Output (Hot Threshold). TOVER goes low when the die temperature
exceeds the factory-programmed hot-temperature threshold. Connect to a 100k
Ω pullup
resistor. Can be pulled up to a voltage higher than V CC .
5 — TUNDER
Push-Pull Active-High Output (Cold Threshold). TUNDER goes high when the die temperature
falls below the factory-programmed cold-temperature threshold.
— 5 TUNDER
Open-Drain, Active-Low Output (Cold Threshold). TUNDER goes low when the die
temperature goes below the factory-programmed cold-temperature threshold. Connect to a
100k
Ω
pullup resistor. Can be pulled up to a voltage higher than V CC .