MCP9801

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

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 MCP9801 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 MCP9801 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. Address selection inputs allow up to eight MCP9801 sensors to share the same 2-wire bus for multizone monitoring.Small physical size, low installed cost and ease of usemake the MCP9801 an ideal choice for implementingsophisticated temperature system management schemes in a variety of applications.