2011-2016 Microchip Technology Inc.
DS20002268B-page 1
MCP9501/2/3/4
Features
• Factory Set Temperature Switch
• Available Temperature Switch Thresholds:
- T
SET
= -35°C, -25°C, -15°C, -5°C, +5°C,
+15°C, +25°C, +35°C, +45°C, +55°C, +65°C,
+75°C, +85°C, +95°C, +105°C, +115°C,
+125°C
• Wide Operating Voltage Range: 2.7V to 5.5V
• Low Supply Current: 25 µA (typical)
• Qualification: AEC-Q100 Rev. G, Grade 1
(-40°C to +125°C)
• Temperature Switch Accuracy:
- ±1°C (typical)
- ±4°C (maximum) between -15°C to +75°C
- ±6°C (maximum) between -40°C to +125°C
• Switch Threshold Options (Hot/Cold):
- Rising temperature: MCP9501/2 (Hot option)
-
Falling temperature: MCP9503/4 (Cold option
)
• Output Configuration Options:
- Active-low, open-drain output: MCP9501/3
- Uses external pull-up resistor
- Active-high, push-pull output: MCP9502/4
• User-Selectable Hysteresis: +2°C or +10°C
(typical)
• 5-Lead SOT-23 Package
Applications
• Power Supply Critical Temperature Shutdown
• Temperature Alarm
• Thermostat Control
• Fan Control
• Base Stations
• Automotive
Typical Performance
Description
Microchip Technology’s MCP9501/2/3/4 family devices
are temperature switches with ±1°C (typical) accurate
factory set output thresholds. These devices are ideal for
high-power supply systems where an overtemperature
protection circuit is needed. These devices do not
require external components, consume 25 µA (typical),
and the factory set thresholds provide simplicity.
In addition, this family of devices provides
user-selectable +2°C and +10°C (typical) switch hyster-
esis, and various output configurations. The MCP9501/2
outputs switch for rising temperatures, while the
MCP9503/4 devices switch for falling temperatures, with
the relative hysteresis at the set thresholds. This family
of devices is also available with an active-high, push-pull
output (MCP9502/4) and an active-low, open-drain
output (MCP9501/3). The push-pull output is ideal for a
microcontroller interface, while the open-drain output
can be used for level shifting, wired-OR configuration or
as a heater on/off switch.
The MCP9501/2/3/4 devices operate from a 2.7V to 5.5V
supply. This family is available with the space-saving
5-lead SOT-23 package.
Package Types
0%
5%
10%
15%
20%
25%
30%
35%
40%
-4.0 -3.0 -2.0 -1.0
0.0
1.0
2.0
3.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= -35°C to +125°C
V
DD
= 4.1V
32 Units
4
1
2
3
5
GND
HYST
MCP9501/2/3/4
5-Lead SOT-23
GND
Output
V
DD
Temperature Switch with Selectable Hysteresis
MCP9501/2/3/4
DS20002268B-page 2
2011-2016 Microchip Technology Inc.
OUTPUT FUNCTIONAL DESCRIPTION
Temperature
COLD
HOT
V
Output
Hysteresis
T
HYST
MCP9501, Hot Option (Open-Drain, Active-Low)
Temperature
V
Output
COLD
HOT
Hysteresis
T
HYST
MCP9502, Hot Option (Push-Pull, Active-High)
Temperature
V
Output
COLD
HOT
T
SET
Hysteresis
MCP9503, Cold Option (Open-Drain, Active-Low)
COLD
HOT
V
Output
Hysteresis
T
SET
MCP9504, Cold-Option (Push-Pull, Active-High)
Temperature
Note:
Available temperature thresholds for
Option P or for rising temperature
only: +5°C, +15°C, +25°C, +35°C,
+45°C, +55°C, +65°C, +75°C, +85°C,
+95°C, +105°C, +115°C, +125°.
Note:
Available temperature thresholds for
Option P or for rising temperature
only: +5°C, +15°C, +25°C, +35°C,
+45°C, +55°C, +65°C, +75°C, +85°C,
+95°C, +105°C, +115°C, +125°.
Note:
Available temperature thresholds for
Option P or for rising temperature
only: +5°C, +15°C, +25°C.
Available temperature thresholds for
Option N or for falling temperature
only: -35°C, -25°C, -15°C, -5°C.
Contact Microchip for all other threshold
options.
Note:
Available temperature thresholds for
Option P or for rising temperature
only: +5°C, +15°C, +25°C.
Available temperature thresholds for
Option N or for falling temperature
only: -35°C, -25°C, -15°C, -5°C.
T
SET
T
SET
T
HYST
T
HYST
2011-2016 Microchip Technology Inc.
DS20002268B-page 3
MCP9501/2/3/4
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings
(
†
)
V
DD
...................................................................................................................................................................... 6.0V
Voltage on All Input/Output Pins – GND ..................................................................................................0.3V to 6.0V
Input/Output Current ......................................................................................................................................... 20 mA
Storage Temperature ........................................................................................................................ -65°C to +150°C
Ambient Temperature with Power Applied ........................................................................................ -40°C to +125°C
Junction Temperature (T
J
) .............................................................................................................................. +150°C
ESD Protection on All Pins:
HBM....................................................................................................................................................... 4 kV
MM........................................................................................................................................................ 400V
Latch-up Current at Each Pin (+25°C) ......................................................................................................... ±200 mA
† Notice:
Stresses above those listed under “Maximum Ratings” may cause permanent damage to the device. This
is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational listings of this specification is not implied. Exposure to maximum rating conditions for extended
periods may affect device reliability
.
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, T
A
= -40°C to +125°C, GND = Ground.
Parameters
Symbol
Minimum
Typical
Maximum
Unit
Conditions
Sensor Accuracy
—
-4
±1
+4
°C
-15°C ≤ T
A
≤ +75°C
(
Note 1
)
-6
±2
+6
°C
-40°C ≤ T
A
≤ +125°C
Power Supply
Operating Voltage
V
DD
2.7
—
5.5
V
Operating Current
I
DD
—
25
40
µA
Line Regulation
°C/V
—
0.2
—
°C/V V
DD
= 2.7V to 5.5V
Hysteresis
Trip Point Hysteresis
T
HYST
—
2
—
°C
HYST = GND
10
—
°C
HYST = V
DD
Hysteresis Select Input
V
IH
0.8 V
DD
—
—
V
V
IL
—
—
0.2 V
DD
V
I
LEAK
—
0.1
—
µA
Open-Drain Output Leakage
I
LEAK
—
0.1
10
µA
MCP9501/3
Output Voltage High
V
OH
0.8 V
DD
—
—
V
I
OUT
= 5 mA (MCP9502/4)
Output Voltage Low
V
OL
—
—
0.2 V
DD
V
I
OUT
= 5 mA
Turn On Time
T
ON
—
1
—
ms
Response Time to Thermal Shock:
SOT23-5
T
RES
—
1.7
—
s
Time to 63% (+89°C),
+25°C (air) to +125°C
(oil bath)
Note 1:
This specification is tested at mid-supply of 4.1V for optimum operation across the supply voltage range of
2.7V to 5.5V.
MCP9501/2/3/4
DS20002268B-page 4
2011-2016 Microchip Technology Inc.
TEMPERATURE SPECIFICATIONS
Electrical Specifications:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, T
A
= -40°C to +125°C, GND = Ground.
Parameters
Symbol
Minimum
Typical
Maximum
Unit
Conditions
Temperature Ranges
Specified Temperature Range
T
A
-40
—
+125
°C
(
Note 1
)
Operating Temperature Range
T
A
-40
—
+125
°C
Storage Temperature Range
T
A
-65
—
+150
°C
Thermal Package Resistances
Thermal Resistance
JA
—
220.7
—
°C/W
Note 1:
Operation in this range must not cause T
J
to exceed the maximum junction temperature (+150°C).
2011-2016 Microchip Technology Inc.
DS20002268B-page 5
MCP9501/2/3/4
2.0
TYPICAL PERFORMANCE CURVES
Note:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, T
A
= -40°C to +125°C, GND = Ground, R
PULL-UP
= 10 k
(MCP9501/3 only) and 0.1 µF bypass capacitor.
FIGURE 2-1:
Temperature Accuracy.
FIGURE 2-2:
Hysteresis vs. Temperature.
FIGURE 2-3:
Supply Current vs.
Temperature.
FIGURE 2-4:
Leakage vs. Temperature.
FIGURE 2-5:
V
OL
,
V
OH
vs. Temperature.
FIGURE 2-6:
Power-on Reset Threshold
vs. Temperature.
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
-6.0
-4.0
-2.0
0.0
2.0
4.0
6.0
-40
-20
0
20
40
60
80
100
120
Temperature Accuracy
(
°C)
T
A
(°C)
Spec. Limits
+ St. Dev.
Average
- St. Dev.
V
DD
= 4.1V
32 units
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
-40 -20
0
20
40
60
80 100 120
HYST =
VDD, Hy
steresis
(°C)
HYST =
VSS, Hy
steresis (°
C)
T
A
(°C)
HYST = V
SS
HYST = V
DD
10
15
20
25
30
35
40
-40
-20
0
20
40
60
80
100
120
I
DD
(µA)
T
A
(°C)
V
DD
= 5.5V
V
DD
= 4.1V
V
DD
= 2.7V
0.00
0.02
0.04
0.06
0.08
0.10
-40
-20
0
20
40
60
80
100
120
Leakage (µA)
T
A
(°C)
HYST Input Pin
Open-Drain Output
(MCP9501/3 only)
80%
85%
90%
95%
100%
0%
5%
10%
15%
20%
-40 -20
0
20
40
60
80 100 120
V
OH
(%
of
V
DD
)
V
OL
(%
of
V
DD
)
T
A
(°C)
V
OH
, V
DD
= 5.5V
V
OH
, V
DD
= 4.1V
V
OH
, V
DD
= 2.7V
V
OL
, V
DD
= 5.5V
V
OL
, V
DD
= 4.1V
V
OL
, V
DD
= 2.7V
-75
-65
-55
-45
-35
-25
-15
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-40
-20
0
20
40
60
80
100 120
V
POR
Hy
steresis
(mV)
V
POR
(V)
T
A
(°C)
V
POR
Hysteresis
MCP9501/2/3/4
DS20002268B-page 6
2011-2016 Microchip Technology Inc.
Note:
Unless otherwise indicated, V
DD
= 2.7V to 5.5V, T
A
= -40°C to +125°C, GND = Ground, R
PULL-UP
= 10 k
(MCP9501 only) and 0.1 µF bypass capacitor.
FIGURE 2-7:
Temperature Accuracy
Distribution at -15°C.
FIGURE 2-8:
Temperature Accuracy
Distribution at +5°C.
FIGURE 2-9:
Temperature Accuracy
Distribution at +65°C.
FIGURE 2-10:
Temperature Accuracy
Distribution at +105°C.
FIGURE 2-11:
Temperature Accuracy
Distribution at +115°C.
FIGURE 2-12:
Temperature Accuracy
Distribution at +125°C.
0%
10%
20%
30%
40%
50%
60%
-4.0
-2.0
0.0
2.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= -15°C
V
DD
= 4.1V
492 Units
0%
10%
20%
30%
40%
50%
60%
-4.0
-2.0
0.0
2.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= 5°C
V
DD
= 4.1V
480 Units
0%
10%
20%
30%
40%
50%
60%
-4.0
-2.0
0.0
2.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= 65°C
V
DD
= 4.1V
480 Units
0%
10%
20%
30%
40%
50%
60%
-4.0
-2.0
0.0
2.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= 105°C
V
DD
= 4.1V
480 Units
0%
10%
20%
30%
40%
50%
60%
-4.0
-2.0
0.0
2.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= 115°C
V
DD
= 4.1V
239 Units
0%
10%
20%
30%
40%
50%
60%
-4.0
-2.0
0.0
2.0
4.0
Occurrences
Temperature Accuracy (°C)
T
A
= 125°C
V
DD
= 4.1V
480 Units
2011-2016 Microchip Technology Inc.
DS20002268B-page 7
MCP9501/2/3/4
3.0
PIN DESCRIPTION
The description of the pins is listed in
Table 3-1
.
3.1
Ground (GND)
The GND pin is the system ground pin. Pin 2 must be
connected to system ground. Pin 1 can also be
connected to system ground which would provide
better thermal conduction to the die.
3.2
Hysteresis Input (HYST)
This is an input pin which can be connected to V
DD
or
GND to select the output hysteresis. Either +2°C
(HYST = GND) or +10°C (HYST = V
DD
)
of the typical
hysteresis can be selected.
3.3
Power Pin (V
DD
)
The operating voltage range, as specified in the
“DC
Characteristics”
table, is applied to this pin.
3.4
Switch Output (Output)
This output is triggered when the temperature rises or
falls beyond the programmed trip temperature thresh-
old. MCP9501/3 devices require an external pull-up
resistor.
TABLE 3-1:
PIN FUNCTIONS
MCP9501/2/3/4
Symbol
Description
5-Lead SOT-23
1
GND
Ground
2
GND
Ground (must be connected to ground)
3
HYST
Hysteresis Selection Input:
HYST = GND
Hysteresis is +2°C (typical)
HYST = V
DD
Hysteresis is +10°C (typical)
4
V
DD
Power Pin
5
Output
Output Options:
MCP9501
Open-Drain, Active-Low Output (Hot Option)
MCP9502
Push-Pull, Active-High Output (Hot Option)
MCP9503
Open-Drain, Active-Low Output (Cold Option)
MCP9504
Push-Pull, Active-High Output (Cold Option)
MCP9501/2/3/4
DS20002268B-page 8
2011-2016 Microchip Technology Inc.
NOTES:
2011-2016 Microchip Technology Inc.
DS20002268B-page 9
MCP9501/2/3/4
4.0
FUNCTIONAL DESCRIPTION
The MCP9501/2/3/4 temperature switch family
integrates a thermal diode, a comparator and a
factory-selectable resistive network used to set the tem-
perature thresholds. The available output thresholds
range from -35°C to +125°C at 10°C increments. There
is no additional configuration required to operate this
device. The selectable output hysteresis is controlled
using a single input pin. When this pin is connected to
ground, the output hysteresis is +2°C (typical), and when
connected to V
DD
, the output hysteresis is +10°C
(typical).
Figure 4-1
shows the functional block diagram.
FIGURE 4-1:
Functional Block Diagram.
There are two output configurations for this family: a
push-pull, and an open-drain output with active-high
and active-low assertions. These assertion options are
referred to as Cold and Hot options, primarily due to the
direction of the selected hysteresis. For the Cold
option, temperature has to fall below the threshold for
the output to assert high and deassert low when the
temperature rises above the threshold plus the
hysteresis. For example, for a +65°C threshold and
+2°C (typical) hysteresis, when temperature falls below
+65°C, the output asserts high and deasserts low when
temperature rises above +67°C. For the Hot option, the
opposite is true. When temperature rises above +65°C,
the output asserts low and deasserts high when the
temperature falls below +63°C.
Figure 4-2
shows a
graphical description for the Hot and Cold options.
FIGURE 4-2:
Output Hysteresis.
The push-pull output is ideal for a microcontroller
interface using an input/output pin or an interrupt input
pin. The open-drain option can be used with multiple
sensors in a wired-OR configuration or as a level
shifter.
I
SET
R
x
+
–
OUT/
OUT
Thermal
Diode
Hysteresis
Select Pin
Threshold
Select
Cold
Hot
T
SET
T
HYST
Temperature
V
Ou
tp
ut
+10°C Typical Hysteresis
+2°C Typical
Hysteresis
Cold
Hot
T
SET
T
HYST
Temperature
V
Ou
tp
u
t
+10°C Typical Hysteresis
+2°C Typical
Hysteresis
Hot Option (Active-Low)
Cold Option (Active-High)
MCP9501/2/3/4
DS20002268B-page 10
2011-2016 Microchip Technology Inc.
4.1
Application Information
The MCP9501/2/3/4 temperature switch family
integrates a temperature sensor and a comparator
circuit, which outputs an alert signal when the factory set
temperature threshold is exceeded. No additional com-
ponent is required for device operation, which provides
simplicity to the system designer. The device output
options provide design flexibility for various applications,
such as overtemperature protection circuit or a
closed-loop temperature control unit. This device can be
interfaced to a closed-loop fan controller network without
the need for a microcontroller.
FIGURE 4-3:
Fan Controller Using
MCP9502.
The MCP9501/2/3/4 family provides an open-drain
output, where multiple sensors from multiple PCB
hotspots, can be connected to a single processor I/O
input with a wired-OR configuration. The MCP9501
requires an external pull-up resistor, which can be used
to level shift the alert signal. For example, if the sensors
are powered with 5 V
DD
and the controller or processor
is powered with 3 V
DD
, the external resistor can be
level shifted by connecting 3 V
DD
to the pull-up resistor,
as shown in
Figure 4-4
.
FIGURE 4-4:
MCP9501 Wired-OR Output
Configuration with Level Shift.
4.1.1
LAYOUT CONSIDERATION AND
THERMAL CONSIDERATION
This family of sensors measures temperature by
monitoring the voltage level of a thermal diode located
in the die. A low-impedance thermal path between the
die and the PCB is provided by the pins. Therefore, the
sensor effectively monitors PCB temperature. For
efficient performance, it is recommended to layout the
device as close to the heat source as possible.
When connecting an external resistor to the
MCP9501/3, the current through the pull-up resistor
must be considered to prevent self-heat due to power.
This can be determined using
Equation 4-1
.
EQUATION 4-1:
EFFECT OF
SELF-HEATING
For example, at room temperature, when the output
asserts active-low and the maximum I
DD
= 50 µA,
V
DD
= 5.5V, V
OL
= 0.3V and I
OUT
= 5 mA (see
“DC
Characteristics”
), the self-heating due to power
dissipation (T
J
– T
A
) is ~0.4°C.
Output
HYST
5 V
DD
12V
MCP9502
M
OUT
HYST
5 V
DD
OUT
HYST
5V
DD
I/O
R
P
U
LL_
UP
MCU
3 V
DD
MCP9501
+85°C
MCP9503
+35°C
Where:
T
J
= Junction Temperature
T
A
= Ambient Temperature
JA
= Package Thermal Resistance
(220.7°C/W)
V
OL
= Sensor Output Low Voltage
I
OUT
= Output Current
T
J
T
A
–
JA
V
DD
I
DD
V
OL
I
OUT
+
=