Allgemeine Beschreibung

MCP9700/9700A/9700B and MCP9701/9701A sensors with Linear Active Thermistor Integrated Circuit (IC) comprise a family of analog temperature sensors that convert temperature to analog voltage.
The low-cost, low-power sensors feature an accuracy of ±1°C from +20°C to +70°C (MCP9700B), ±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 (VOUT) can be directly connected to the ADC input of a microcontroller. The MCP9700/9700A/9700B 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/ 9700B output 0.1°C/bit for a 12-bit ADC with 4.096V reference.
The MCP9700/9700A/9700B and MCP9701/9701A provide 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 (typical) can be realized from 0°C to +70°C. This accuracy can also be achieved by applying system calibration at +25°C. The MCP9700B can measure temperature with ±1°C from +20°C to +70°C without any system calibration.
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.

 

Eigenschaften

• Tiny Analog Temperature Sensor
• Available Packages:
– SC70-5, SOT-23-3, TO-92-3 (not available with the MCP9700B)
• Wide Temperature Measurement Range:
– -40°C to +125°C (Extended Temperature)
– -40°C to +150°C (High Temperature) (MCP9700 and MCP9700B, SOT-23-3 and SC70-5 only)
• Accuracy:
– ±1°C (max.), +20°C to +70°C (MCP9700B)
– ±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/ 9700B)
– 19.5 mV/°C (typical) (MCP9701/9701A)
• Wide Operating Voltage Range:
– VDD = 2.3V to 5.5V (MCP9700/9700A/ 9700B)
– VDD = 3.1V to 5.5V (MCP9701/9701A)
• Low Operating Current: 6 µA (typical)
• Optimized to Drive Large Capacitive Loads
• Automotive Qualified Options Available

 

Typische Anwendungen

• Automotive
• Hard Disk Drives and Other PC Peripherals
• Entertainment Systems
• Home Appliance
• Office Equipment
• Battery Packs and Portable Equipment
• General Purpose Temperature Monitoring

 

DC ELECTRICAL CHARACTERISTICS

1. MCP9700 and MCP9700B with SC70-5 and SOT-23-3 packages only. The MCP9700 High Temperature is not available with TO-92 package.
2. The MCP9700/9700A/9700B family accuracy is tested with VDD = 3.3V, while the MCP9701/9701A accuracy is tested with VDD = 5.0V.
3. The MCP9700/9700A/9700B and MCP9701/9701A family is characterized using the first-order or linear equation.
4. The MCP9700/9700A/9700B and MCP9701/9701A family is characterized and production tested with a capacitive load of 1000pF.
5. SC70-5 package thermal response with 1×1 inch, dual-sided copper clad, TO-92-3 package thermal response without PCB (leaded).

 

Output Voltage Pin (VOUT)

The sensor output can be measured at VOUT. The voltage range over the operating temperature range for the MCP9700/9700A/9700B is 100 mV to 1.75V. The voltage range over the operating temperature range for the MCP9701/9701A is 200 mV to 3V.

 

No Connect Pin (NC)

This pin is not connected to the die. It can be used to improve thermal conduction to the package by connecting it to a printed circuit board (PCB) trace from the thermal source.

 

ANWENDUNGSINFORMATIONEN

The Linear Active Thermistor™ IC uses an internal diode to measure temperature. The diode electrical characteristics have a temperature coefficient that provides a change in voltage based on the relative ambient temperature from -40°C to 150°C. The change in voltage is scaled to a temperature coefficient of 10.0 mV/°C (typical) for the MCP9700/9700A/9700B and 19.5 mV/°C (typical) for the MCP9701/9701A. The output voltage at 0°C is also scaled to 500 mV (typical) and 400 mV (typical) for the MCP9700/9700A/9700B and MCP9701/9701A, respectively.