MCP9501/2/3/4
Temperature Switch with Selectable Hysteresis
Features
Description
• Factory Set Temperature Switch
• Available Temperature Switch Thresholds:
- TSET = -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)
• Temperature Switch Accuracy:
- ±1°C (typical)
- ±4°C (maximum) -15°C to +75°C
- ±6°C (maximum) -40°C to +125°C
• Switch Threshold Options (Hot/Cold):
- Rising Temp.: MCP9501/2 (Hot Option)
- Falling Temp.: MCP9503/4 (Cold Option)
• Output Configuration Options:
- Active Low, Open-Drain Output: MCP9501/3
Microchip Technology’s MCP9501/2/3/4 family of
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.
– 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
•
•
•
•
•
•
In addition, this family of devices provide user
selectable 2°C and 10°C (typical) switch hysteresis,
and various output configurations. The MCP9501/2
outputs switch for rising temperatures while the
MCP9503/4 switch for falling temperature, with the
relative hysteresis at the set thresholds. This family of
devices is also available with Active-High Push-Pull
and Active-Low Open-Drain outputs, the MCP9502/4
and the MCP9501/3, respectively. The Push-Pull
output is ideal for a microcontroller interface while the
Open-Drain output can be used for level shifting, wiredOR configuration, or as a heater on/off switch.
The MCP9501/2/3/4 operate from 2.7V to 5.5V supply.
This family is available with space saving 5-lead
SOT-23 package.
Package Types
Power Supply Critical Temperature Shutdown
Temperature Alarm
Thermostat Control
Fan Control
Base-Stations
Automotive
MCP9501/2/3/4
SOT-23-5
GND 1
5 Output
GND 2
Hyst 3
Typical Performance
4 VDD
50%
TA = -35°C to 125°C
VDD = 4.1V
32 Units
Occurrences
40%
30%
20%
10%
4.0
2.0
0.0
-2.0
-4.0
0%
Temperature Accuracy (°C)
© 2011 Microchip Technology Inc.
DS22268A-page 1
MCP9501/2/3/4
OUTPUT FUNCTIONAL DESCRIPTION
MCP9501, Hot-Option (Open-Drain, Active-Low)
Hysteresis
V
Output
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°.
Temperature
COLD
THYST TSET
HOT
MCP9502, Hot-Option (Push-Pull, Active-High)
Hysteresis
V
Output
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°.
Temperature
COLD
THYST TSET
HOT
MCP9503, Cold-Option (Open-Drain, Active-Low)
Hysteresis
V
Output
COLD
TSET THYST
Note:
Available temperature thresholds for
Option P or for rising temperature only:
+5°C, +15°C, +25°C.
Note:
Available temperature thresholds for
Option N or for falling temperature only:
-35°C, -25°C, -15°C, -5°C.
Temperature
HOT
MCP9504, Cold-Option (Push-Pull, Active-High)
Hysteresis
V
Output
Note:
Available temperature thresholds for
Option P or for rising temperature
only: +5°C, +15°C, +25°C.
Note:
Available temperature thresholds for
Option N or for falling temperature
only: -35°C, -25°C, -15°C, -5°C.
Note:
Contact Microchip for all other
threshold options.
Temperature
COLD
DS22268A-page 2
TSET THYST
HOT
© 2011 Microchip Technology Inc.
MCP9501/2/3/4
1.0
ELECTRICAL
CHARACTERISTICS
Junction Temperature (TJ) .......................................... +150°C
ESD protection on all pins (HBM:MM) ................. (4 kV/400V)
Latch-Up Current at each pin (25°C) ....................... ±200 mA
Absolute Maximum Ratings †
†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.
VDD.................................................................................. 6.0V
Voltage at all Input/Output pins ............... GND – 0.3V to 6.0V
Input/Output Current .....................................................20 mA
Storage temperature .....................................-65°C to +150°C
Ambient temp. with power applied ................-40°C to +125°C
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, TA = -40°C to +125°C, and
GND = Ground.
Parameters
Sym
Min
Typ
Max
Unit
-15°C ≤ TA ≤ +75°C
-4
±1
+4
°C
-40°C ≤ TA ≤ +125°C
-6
±2
6
°C
Conditions
Sensor Accuracy
Note 1
Power Supply
Operating Voltage
VDD
2.7
—
5.5
V
Operating Current
IDD
—
25
40
µA
Δ°C/ΔV
—
0.2
—
THYST
—
2
—
°C
HYST = GND
—
10
—
°C
HYST = VDD
Line-Regulation
°C/V VDD = 2.7V to 5.5V
Hysteresis
Trip Point Hysteresis
Hysteresis Select Input
VIH
0.8VDD
—
—
V
VIL
—
—
0.2VDD
V
ILeak
—
0.1
—
µA
Open-Drain Output Leakage
ILeak
—
0.1
10
µA
MCP9501/3
Output Voltage High
VOH
0.8VDD
—
—
V
IOUT = 5 mA (MCP9502/4)
Output Voltage Low
VOL
—
—
0.2VDD
V
IOUT = 5 mA
Turn On Time
TON
—
1
—
ms
SOT23-5
tRES
—
1.7
—
s
Note 1:
Time to 63% (89°C).
+25°C (Air) to +125°C
(oil bath)
This specification is tested at mid supply of 4.1V for optimum operation across the supply voltage range of
2.7V to 5.5V.
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, TA = -40°C to +125°C, and
GND = Ground.
Parameters
Sym
Min
Typ
Max
Units
Specified Temperature Range
TA
-40
—
+125
°C
Operating Temperature Range
TA
-40
—
+125
°C
Storage Temperature Range
TA
-65
—
+150
°C
θJA
—
220.7
—
°C/Ω
Conditions
Temperature Ranges
(Note 1)
Thermal Package Resistances
Thermal Resistance, 5L-SOT23
Note 1:
Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150°C).
© 2011 Microchip Technology Inc.
DS22268A-page 3
MCP9501/2/3/4
2.0
TYPICAL PERFORMANCE CURVES
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.
Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, TA = -40°C to +125°C, GND = Ground, RPULL-UP = 10 kΩ
(MCP9501/3 only) and 0.1 µF bypass capacitor.
0.10
4.0
+ St. Dev.
Average
- St. Dev.
Spec. Limits
2.0
0.08
Leakage (µA)
0.0
-2.0
HYST Input Pin
0.04
Open-Drain Output
(MCP9501/03 only)
0.02
VDD = 4.1V
32 units
-4.0
0.06
-6.0
0.00
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
TA (°C)
FIGURE 2-1:
40
60
80
100
FIGURE 2-4:
Temperature Accuracy.
Leakage vs. Temperature.
13.0
3.0
12.0
HYST = VSS
11.0
2.0
10.0
1.5
9.0
1.0
8.0
HYST = VDD
0.5
7.0
0.0
15%
VOL (% of VDD)
3.5
10%
0
20
40
60
V OL, VDD = 5.5V
V OL, VDD = 4.1V
V OL, VDD = 2.7V
90%
85%
0%
80%
-40 -20
0
20
40
80 100 120
TA (°C)
FIGURE 2-2:
95%
VOH, VDD = 5.5V
VOH, VDD = 4.1V
VOH, VDD = 2.7V
5%
6.0
-40 -20
100%
FIGURE 2-5:
60 80 100 120
TA (°C)
VOL,VOH vs. Temperature.
Hysteresis vs. Temperature.
3.0
2.5
35
) 2.0
V
(
R
O1.5
P
V
1.0
95
85
VPOR (V)
IDD (µA)
25
105
VPOR
VDD = 5.5V
VDD = 4.1V
VDD = 2.7V
20
75
65
Hysteresis
0.5
15
55
0.0
-40
-20
0
20
40
60
80
100
TA (°C)
FIGURE 2-3:
Temperature.
DS22268A-page 4
Supply Current vs.
P
O
R
H
y
s
te
re
s
is
(m
V
)
45
-40 -20
10
V
VPOR Hysteresis (mV)
40
30
VOH (% of VDD)
14.0
HYST = VDD, Hysteresis (°C)
HYST = VSS, Hysteresis (°C)
20%
4.0
2.5
120
T A (°C)
VPOR Hysteresis (mV)
Temperature Accuracy (°C)
6.0
0
120
FIGURE 2-6:
vs. Temperature.
20
40 60
TA (°C)
80
100 120
Power On Reset Threshold
© 2011 Microchip Technology Inc.
MCP9501/2/3/4
Note: Unless otherwise indicated, VDD = 2.7V to 5.5V, TA = -40°C to +125°C, GND = Ground, RPULL-UP = 10 kΩ
(MCP9501 only) and 0.1 µF bypass capacitor.
60%
60%
TA = -15\°C
VDD = 4.1V
492 Units
50%
TA = 105\°C
VDD = 4.1V
480 Units
50%
s 40%
e
c
n
e
rr 30%
u
c
c 20%
O
Occurrences
Occurrences
Occurrences
s 40%
e
c
n
e
rr 30%
u
c
c 20%
O
10%
10%
0%
FIGURE 2-7:
Temperature Accuracy
Distribution at -15°C.
4.0
2.0
0
0
0
.
.
.
0
2
-2
Temperature
Accuracy
(°C)
(°C)
(°C)
TTTAAA(°C)
0
.
4
FIGURE 2-10:
Temperature Accuracy
Distribution at 105°C.
60%
60%
TA = 5\°C
VDD = 4.1V
480 Units
50%
0.0
0
.
-4
-2.0
0
.
4
4.0
2.0
0.0
-2.0
-4.0
0
0
0
.
.
.
0
2
-2
Temperature
Accuracy (°C)
TA (°C)
-4.0
0%
0
.
4
-
TA = 115\°C
VDD = 4.1V
480 Units
50%
s 40%
e
c
n
e
rr 30%
u
c
c 20%
O
Occurrences
Occurrences
s 40%
e
c
n
e
rr 30%
u
c
c 20%
O
10%
10%
4.0
2.0
0
0
0
.
.
.
0
2
-2
T
(°C)
TemperatureAAccuracy (°C)
0
.
4
FIGURE 2-11:
Temperature Accuracy
Distribution at 115°C.
60%
TA = 65\°C
VDD = 4.1V
480 Units
50%
0.0
0
.
-4
0
.
4
FIGURE 2-8:
Temperature Accuracy
Distribution at 5°C.
60%
-4.0
0
0
0
.
.
.
0
2
-2
T
(°C)
Temperature
Accuracy (°C)
A
4.0
2.0
0.0
-2.0
-4.0
0
.
4
-
-2.0
0%
0%
TA = 125\°C
VDD = 4.1V
480 Units
50%
Occurrences
s 40%
e
c
n
e
rr 30%
u
c
c 20%
O
Occurrences
s 40%
e
c
n
e
rr 30%
u
c
c 20%
O
10%
10%
FIGURE 2-9:
Temperature Accuracy
Distribution at 65°C.
© 2011 Microchip Technology Inc.
0
0
0
.
.
.
0
2
-2
Temperature
(°C)
TA Accuracy
(°C)
4.0
2.0
0
.
-4
0.0
0%
-2.0
.0
4
-4.0
.0
.0
.0
2
0
2
TA (°C)Accuracy (°C)
Temperature
4.0
2.0
0.0
.0
-4
-2.0
-4.0
0%
0
.
4
FIGURE 2-12:
Temperature Accuracy
Distribution at 125°C.
DS22268A-page 5
MCP9501/2/3/4
3.0
PIN DESCRIPTIONS
TABLE 3-1:
PIN FUNCTION TABLE
MCP9501/2/3/4
Symbol
Description
SOT-23-5
1
GND
Ground
2
GND
Ground (must be connected to ground)
3
HYST
Hysteresis Selection Input:
HYST = GND → Hysteresis is 2°C (typical)
HYST = VDD → Hysteresis is 10°C (typical)
4
VDD
5
Output
Power pin
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)
3.1
Ground (GND)
3.3
Power Pin (VDD)
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.
The operating voltage range, as specified in the DC
electrical specification table, is applied on this pin.
3.2
This output is triggered when temperature rises or falls
beyond the programmed trip temperature threshold.
MCP9501/3 require an external pull-up resistor.
Hysteresis Input (HYS)
This is an input pin which can be connected to VDD or
GND to select output hysteresis. Either 2°C
(HYST = GND) or 10°C (HYST = VDD) of typical
hysteresis can be selected.
DS22268A-page 6
3.4
Switch Output (Output)
© 2011 Microchip Technology Inc.
MCP9501/2/3/4
NOTES:
© 2011 Microchip Technology Inc.
DS22268A-page 7
MCP9501/2/3/4
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
temperature 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 VDD the output
hysteresis is 10°C (typical). Figure 4-1 shows the
functional block diagram.
Hot-Option (Active-Low)
10°C Typical Hysteresis
V
2°C Typical
Hysteresis
Output
4.0
TSET
THYST
ISET
Rx
+
Cold
OUT/
OUT
Cold-Option (Active-High)
-
Hot
Temperature
10°C Typical Hysteresis
V
2°C Typical
Hysteresis
Thermal
Diode
Output
Threshold
Select
Hysteresis
Select Pin
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 selected hysteresis. For the Cold option,
temperature has to fall below the threshold for the
output to assert High, and de-assert Low when the
temperature rises above the threshold plus the
hysteresis. For example, a 65°C threshold and 2°C
(typical) hysteresis, when temperature falls below 65°C
the output asserts High, and the de-asserts 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 de-asserts High when the
temperature falls below 63°C. Figure 4-2 shows a
graphical description for the Hot and Cold options.
DS22268A-page 8
TSET
Cold
THYST
Hot
Temperature
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.
© 2011 Microchip Technology Inc.
MCP9501/2/3/4
4.1
4.1.1
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
component 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.
12V
M
5VDD
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
T J – T A = θ JA ( VDD × I DD + V OL × IOUT )
Where:
HYST
MCP9502
FIGURE 4-3:
MCP9502.
Output
Fan Controller Using
The MCP9501/2/3/4 provide Open-Drain output where
multiple sensors from multiple PCB hot-spots can be
connected to a single processor I/O input with a wiredOR 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
5VDD and the controller or processor is powered with
3VDD, the external resistor can be level-shifted by
connecting 3VDD to the pull-up resistor as shown in
Figure 4-4.
TJ
=
Junction Temperature
TA
=
Ambient Temperature
θJA
=
Package Thermal Resistance
(220.7 °C/W)
VOL
=
Sensor Output Low Voltage
IOUT
=
Output Current
For example, at room temperature, when the output
asserts Active-Low and maximum IDD = 50 µA,
VDD = 5.5V, VOL = 0.3V and IOUT = 5 mA (see the
specification table), the self heating due to power
dissipation (TJ - TA) is ~0.4°C.
5VDD
5VDD
RPULL_UP
3VDD
MCP9501 OUT
HYST
85°C
Microcontroller
I/O
HYST MCP9503 OUT
35°C
FIGURE 4-4:
MCP9501 Wired-OR Output
Configuration with Level-shift.
© 2011 Microchip Technology Inc.
DS22268A-page 9
MCP9501/2/3/4
4.1.2
POWER SUPPLY REJECTION
The MCP9501/2/3/4 family does not require any
additional components. However, it is recommended
that a decoupling capacitor of 0.1 µF to 1 µF be used
between the VDD and GND pins. A high-frequency
ceramic capacitor is recommended. It is necessary for
the capacitor to be located as close as possible to the
power pins in order to provide effective noise
protection.
The MCP9501/2/3/4 family of sensors is designed to
prevent false output trigger due to high frequency
power supply or system noise. Figure 4-6 shows the
device performance with a high frequency signal added
on VDD. The output is not triggered due to the signal
added on VDD. With some applications, it is
recommended to add a bypass capacitor of 0.1 µF to
1 µF.
6
MCP9501/2/3/4 TSET = 25\°C Power Supply Rejection
200Ω
VDD
Switching
Regulator
0.1 µF
bypass
MCP9501/2/3/4
Switching
Regulator
200Ω
Linear
Regulator 0.1 µF
bypass
FIGURE 4-5:
Single Resistor.
) 5
V
(
e4
g
ta
l
o3
V
t
u
p
t 2
u
O
1
Output Voltage (V)
MCP9501/2/3/4
0
VDD
No False Trigger
TSET = 25\°C
TA = 23\C
°
VDD = 5V + 400mVAC
VDD = 5V + 400mVSQR
10
0
1
100
FIGURE 4-6:
0
0
1
1000
k
k
0 (Hz)
1Frequency
1
Frequency (Hz)
10000
100000
k
0
0
1
1000000
M
1
10000000
M
0
1
Power Supply Rejection.
Power-supply Filter using a
For applications where a switching regulator is used to
power the sensor, it is recommended to add a 200Ω
resistor in series to VDD to filter out the switcher noise.
It is also recommended to add the series resistor in
applications where a linear regulator is used to
step-down a switching regulator voltage to power the
sensor, as shown in Figure 4-5. For example, if a
linearly regulated 3.3V from a 5V switching regulator is
used to power the sensor, add a 200Ω series resistor.
DS22268A-page 10
© 2011 Microchip Technology Inc.
MCP9501/2/3/4
NOTES:
© 2011 Microchip Technology Inc.
DS22268A-page 11
MCP9501/2/3/4
5.0
PACKAGING INFORMATION
5.1
Package Marking Information
Example:
5-Lead SOT-23
4
5
XL25
XXNN
1
4
5
2
3
1
Device
Code
MCP9501PT-005E/OT
WVNN
MCP9501PT-015E/OT
MCP9501PT-025E/OT
MCP9501PT-035E/OT
MCP9501PT-045E/OT
2
Device
Code
MCP9502PT-005E/OT
XLNN
WWNN
MCP9502PT-015E/OT
XMNN
WXNN
MCP9502PT-025E/OT
XPNN
WYNN
MCP9502PT-035E/OT
XQNN
WZNN
MCP9502PT-045E/OT
XRNN
MCP9501PT-055E/OT
X1NN
MCP9502PT-055E/OT
XSNN
MCP9501PT-065E/OT
X2NN
MCP9502PT-065E/OT
XTNN
3
Hot Options
MCP9501PT-075E/OT
X3NN
MCP9502PT-075E/OT
XUNN
MCP9501PT-085E/OT
X4NN
MCP9502PT-085E/OT
XVNN
MCP9501PT-095E/OT
X5NN
MCP9502PT-095E/OT
XWNN
MCP9501PT-105E/OT
X6NN
MCP9502PT-105E/OT
XXNN
MCP9501PT-115E/OT
X7NN
MCP9502PT-115E/OT
XYNN
MCP9501PT-125E/OT
X8NN
MCP9502PT-125E/OT
XZNN
MCP9503PT-005E/OT
XHNN
MCP9501PT-005E/OT
Y9NN
MCP9503PT-015E/OT
XJNN
MCP9501PT-015E/OT
YANN
MCP9503PT-125E/OT
XKNN
MCP9501PT-025E/OT
YBNN
Cold Options
MCP9503NT-005E/OT
XBNN
MCP9501NT-005E/OT
Y3NN
MCP9503NT-015E/OT
XCNN
MCP9501NT-015E/OT
Y4NN
MCP9503NT-025E/OT
XDNN
MCP9501NT-025E/OT
Y5NN
MCP9503NT-035E/OT
XENN
MCP9501NT-035E/OT
Y6NN
Note:
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
DS22268A-page 12
Contact Microchip for all other
threshold options.
Customer-specific information
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
© 2011 Microchip Technology Inc.
MCP9501/2/3/4
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