MCP9700_16 Datasheet, PDF (1/22 Pages) Microchip Technology – Low-Power Linear Active Thermistor ICs

MCP9700/9700A
MCP9701/9701A
Low-Power Linear Active Thermistor ICs
Features
General Description
• Tiny Analog Temperature Sensor
• Available Packages:
- SC70-5, SOT-23-3, TO-92-3
• Wide Temperature Measurement Range:
- -40°C to +125°C (Extended Temperature)
- -40°C to +150°C (High Temperature)
(MCP9700, SOT-23-3 and SC70-5 only)
• Accuracy:
- ±2°C (max.), 0°C to +70°C (MCP9700A/9701A)
- ±4°C (max.), 0°C to +70°C (MCP9700/9701)
• Optimized for Analog-to-Digital Converters (ADCs):
- 10.0 mV/°C (typical) (MCP9700/9700A)
- 19.5 mV/°C (typical) (MCP9701/9701A)
• Wide Operating Voltage Range:
- V_DD = 2.3V to 5.5V (MCP9700/9700A)
- V_DD = 3.1V to 5.5V (MCP9701/9701A)
• Low Operating Current: 6 µA (typical)
• 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
Package Types
MCP9700/9700A and MCP9701/9701A sensors with
Linear Active Thermistor Integrated Circuit (IC) com-
prise a family of analog temperature sensors that
convert temperature to analog voltage.
The low-cost, low-power sensors feature an accuracy
of ±2°C from 0°C to +70°C (MCP9700A/9701A) and
±4°C from 0°C to +70°C (MCP9700/9701) while
consuming 6 µA (typical) of operating current.
Unlike resistive sensors, e.g., 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 a sensor from these low-cost
devices. 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°C/bit resolution
for an 8-bit ADC with a reference voltage of 2.5V and
5V, respectively. The MCP9700/9700A output 0.1°C/bit
for a 12-bit ADC with 4.096V reference.
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°C, an
accuracy of ±1°C (typical) 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 of devices 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 the stability of sensor output.
3-Pin TO-92
MCP9700/9700A
MCP9701/9701A
3-Pin SOT-23
MCP9700/9700A
MCP9701/9701A
5-Pin SC70
MCP9700/9700A
MCP9701/9701A
123
GND
3
NC 1
GND ²
5 NC
Bottom
View
1
V_DD V_OUT GND
1
V_DD
2
V_OUT
V_OUT 3
4 V_DD
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DS20001942G-page 1