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MCP9700A Datasheet

  • MCP9700A

  • Low-Power Linear Active Thermistor? ICs

  • Microchip   Microchip

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MCP9700/9700A
MCP9701/9701A
Low-Power Linear Active Thermistor鈩?ICs
Features
鈥?Tiny Analog Temperature Sensor
鈥?Available Packages: SC-70-5, TO-92-3
鈥?Wide Temperature Measurement Range:
- -40擄C to +125擄C
鈥?Accuracy:
- 鹵2擄C (max.), 0擄C to +70擄C (MCP9700A/9701A)
- 鹵4擄C (max.), 0擄C to +70擄C (MCP9700/9701)
鈥?Optimized for Analog-to-Digital Converters
(ADCs):
- 10.0 mV/擄C (typ.)
MCP9700/9700A
- 19.5 mV/擄C (typ.)
MCP9701/9701A
鈥?Wide Operating Voltage Range:
- V
DD
= 2.3V to 5.5V
MCP9700/9700A
- V
DD
= 3.1V to 5.5V
MCP9701/9701A
鈥?Low Operating Current: 6 碌A(chǔ) (typ.)
鈥?Optimized to Drive Large Capacitive Loads
Description
The MCP9700/9700A and MCP9701/9701A family of
Linear Active Thermistor鈩?Intergrated Circuit (IC) is an
analog temperature sensor that converts temperature
to analog voltage. It鈥檚 a low-cost, low-power sensor
with an accuracy of 鹵2擄C from 0擄C to +70擄C
(MCP9700A/9701A) 鹵4擄C from 0擄C to +70擄C
(MCP9700/9701) while consuming 6 碌A(chǔ) (typ.) of
operating current.
Unlike resistive sensors (such as thermistors), the
Linear Active Thermistor IC does not require an
additional signal-conditioning circuit. Therefore, the
biasing circuit development overhead for thermistor
solutions can be avoided by implementing this low-cost
device. The voltage output pin (V
OUT
) can be directly
connected to the ADC input of a microcontroller. The
MCP9700/9700A and MCP9701/9701A temperature
coefficients are scaled to provide a 1擄C/bit resolution
for an 8-bit ADC with a reference voltage of 2.5V and
5V, respectively.
The MCP9700/9700A and MCP9701/9701A provide a
low-cost solution for applications that require measure-
ment of a relative change of temperature. When mea-
suring relative change in temperature from +25擄C, an
accuracy of 鹵1擄C (typ.) can be realized from 0擄C to
+70擄C. This accuracy can also be achieved by applying
system calibration at +25擄C.
In addition, this family is immune to the effects of
parasitic capacitance and can drive large capacitive
loads. This provides Printed Circuit Board (PCB) layout
design flexibility by enabling the device to be remotely
located from the microcontroller. Adding some
capacitance at the output also helps the output
transient response by reducing overshoots or
undershoots. However, capacitive load is not required
for sensor output stability.
Typical Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Hard Disk Drives and Other PC Peripherals
Entertainment Systems
Home Appliance
Office Equipment
Battery Packs and Portable Equipment
General Purpose Temperature Monitoring
Typical Application Circuit
V
DD
PICmicro廬
ANI
MCU
V
SS
Package Type
V
DD
C
bypass
0.1 碌F
V
DD
MCP9700
GND
V
OUT
5-Pin SC-70
MCP9700/9700A
MCP9701/9701A
NC 1
GND 2
V
OUT
3
4 V
DD
Bottom
View
1
V
DD
V
OUT
GND
5 NC
3-Pin TO-92
MCP9700/9701
Only
123
漏
2006 Microchip Technology Inc.
DS21942C-page 1

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