MCP9802

Features:

• Temperature-to-Digital Converter
• Accuracy with 12-bit Resolution:
- ±0.5°C (typ.) at +25°C
- ±1°C (max.) from -10°C to +85°C
- ±2°C (max.) from -10°C to +125°C
- ±3°C (max.) from -55°C to +125°C
• User-selectable Resolution: 9 12 bit
• Operating Voltage Range: 2.7V to 5.5V
• 2-wire Interface: I2C™/SMBus Compatible
• Operating Current: 200 A (typ.)
• Shutdown Current: 1 A (max.)
• Power-saving One-shot Temperature Measurement
• Available Packages: SOT-23-5, MSOP-8, SOIC-8




Application

• Personal Computers and Servers
• Hard Disk Drives and Other PC Peripherals
• Entertainment Systems
• Office Equipment
• Data Communication Equipment
• Mobile Phones
• General-purpose Temperature Monitoring




Pinout






Specifications

Parameter Name	Value
Typical Accuracy (°)	0.5
Max Input/ Supply Current (A)	400
Max. Accuracy @ 25° (°)	1
Temp. Range (°C)	-55 to +125
Operating Voltage Range (V)	+2.7 to +5.5
Device Description	Serial Output Temp Sensor

Parameter NameValueTypical Accuracy (°)0.5Max Input/ Supply Current (A)400Max. Accuracy @ 25° (°)1Temp. Range (°C)-55 to +125Operating Voltage Range (V)+2.7 to +5.5Device DescriptionSerial Output Temp Sensor

Absolute Maximum Ratings †
V_DD....................................................................... 6.0V
Voltage at all Input/Output pins .... GND 0.3V to 5.5V
Storage temperature ........................-65°C to +150°C
Ambient temp. with power applied ...-55°C to +125°C
Junction Temperature (T_J).................................. 150°C
ESD protection on all pins (HBM:MM).......... (4 kV:400V)
Latch-Up Current at each pin ........................ ±200 mA

†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.




Description

The MCP9802 is a digital temperature sensor capable of reading temperatures from -55°C to +125°C. Temperature data is measured from an integrated temperature sensor and converted to digital word with a user selectable 9 to 12-bit Sigma Delta Analog to Digital Converter.The MCP9802 notifies the host controller when the ambient temperature exceeds a user programmed set point. The ALERT output is programmable as either a simple comparator for thermostat operation or as a temperature event interrupt. Communication with the sensor is accomplished via a two-wire bus that is compatible with industry standard protocols. This permits reading the current temperature, programming the set point and hysteresis, and configuring the device. The MCP9802 also contains SMBus Timeout logic for improved system reliability.Small physical size, low installed cost, and ease of usemake the MCP9802 an ideal choice for implementingsophisticated temperature system management schemes in a variety of applications.

Microchip Technology Inc.'s MCP9800/MCP9802 family of digital temperature sensors converts temperatures between -55°C and +125°C to a digital word. They provide an accuracy of ±1°C (max.) from -10°C to +85°C.

The MCP9800/MCP9802 family comes with user-programmable registers that provide flexibility for temperature sensing applications. The register settings allow userselectable 9-bit to 12-bit temperature measurement resolution, configuration of the power-saving Shutdown and One-shot (single conversion on command while in the Shutdown) modes and the specification of both temperature alert output and hysteresis limits. When the temperature changes beyond the specified limits, the MCP9800/MCP9802 outputs an alert signal. The user has the option of setting the alert output signal polarity as an active-low or active-high comparator output for thermostat operation, or as temperature event interrupt output for microprocessor-based systems.

This sensor has an industry standard 2-wire, I²C™/ SMBus compatible serial interface, allowing up to eight devices to be controlled in a single serial bus. These features make the MCP9800/1/2/3 ideal for sophisticated multi-zone temperature-monitoring applications.