MCP9701AT-E Datasheet, PDF (1/18 Pages) Microchip Technology – Low-Power Linear Active Thermistor ICs

MCP9700/01
Low-Power Linear Active Thermistor™ ICs
Features
• Tiny Analog Temperature Sensor
• Available Packages: SC70-5
• Wide Temperature Measurement Range:
- -40°C to +125°C
• Accuracy: ±4°C (max.), 0°C to +70°C
• Optimized for Analog-to-Digital Converters
(ADCs):
- MCP9700: 10.0 mV/°C (typ.)
- MCP9701: 19.5 mV/°C (typ.)
• Wide Operating Voltage Range:
- MCP9700: V_DD = 2.3V to 5.5V
- MCP9701: V_DD = 3.1V to 5.5V
• Low Operating Current: 6 µA (typ.)
• Optimized to Drive Large Capacitive Loads
Typical Applications
• 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
V_DD
10 kΩ
PICmicro^{® ANI}
MCLR _MCU
V_SS
Description
The MCP9700/01 Linear Active Thermistor™
Intergrated Circuit (IC) is an analog temperature sen-
sor that converts temperature to analog voltage. It’s a
low-cost, low-power sensor with an accuracy of ±4°C
from 0°C to +70°C while consuming 6 µA (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 and MCP9701
temperature coefficients are scaled to provide a
1 °C/bit resolution for an 8-bit ADC with a reference
voltage of 2.5V and 5V, respectively.
The MCP9700/01 provides a low-cost solution for
applications that require measurement of a relative
change of temperature. When measuring relative
change in temperature from +25°C, an accuracy of
±1°C (typ.) can be realized from 0°C to +70°C. This
accuracy can also be achieved by applying system
calibration at +25°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.
Package Type
SC70-5
NC 1
GND 2
V_OUT 3
5 NC
4 V_DD
MCP9700/01 V_DD
V_DD
V_OUT
GND
C_bypass
0.1 µF
© 2005 Microchip Technology Inc.
DS21942B-page 1