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MCP9805 Dataheets PDF



Part Number MCP9805
Manufacturers Microchip Technology
Logo Microchip Technology
Description Memory Module Digital Temperature Sensor
Datasheet MCP9805 DatasheetMCP9805 Datasheet (PDF)

www.DataSheet4U.com MCP9805 Memory Module Digital Temperature Sensor Features • Meets JEDEC Standard JC42.4 for Mobile Platform Memory Module Thermal Sensor • Temperature-to-Digital Converter • Accuracy with 0.25 °C/LSb Resolution: - ±1°C (max.) from +75°C to +95°C - ±2°C (max.) from +40°C to +125°C - ±3°C (max.) from -20°C to +125°C • Programmable Temperature Monitor Boundary • Critical Temperature Output • Operating Voltage Range: 3.0V to 3.6V • 2-wire Interface: SMBus/Standard mode I2C™ Comp.

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www.DataSheet4U.com MCP9805 Memory Module Digital Temperature Sensor Features • Meets JEDEC Standard JC42.4 for Mobile Platform Memory Module Thermal Sensor • Temperature-to-Digital Converter • Accuracy with 0.25 °C/LSb Resolution: - ±1°C (max.) from +75°C to +95°C - ±2°C (max.) from +40°C to +125°C - ±3°C (max.) from -20°C to +125°C • Programmable Temperature Monitor Boundary • Critical Temperature Output • Operating Voltage Range: 3.0V to 3.6V • 2-wire Interface: SMBus/Standard mode I2C™ Compatible • Operating Current: 200 µA (typ.) • Shutdown Current: 0.1 µA (typ.) • Available Packages: 2x3 DFN-8, TSSOP-8 Description Microchip Technology Inc.’s MCP9805 digital temperature sensor converts temperatures between -40°C and +125°C to a digital word. This sensor is designed to meet the JEDEC standard JC42.4 for Mobile Platform Memory Module Thermal Sensor. This device provides an accuracy of ±1°C (max.) from a temperature range of +75°C to +95°C (active range) and ±2°C (max.) from +40°C to +125°C (monitor range) as defined in the JEDEC standard. The MCP9805 comes with user-programmable registers that provide flexibility for DIMM temperature-sensing applications. The registers allow user-selectable settings such as Shutdown or Low-Power modes and the specification of temperature event and critical output boundaries. When the temperature changes beyond the specified boundary limits, the MCP9805 outputs an Event signal. The user has the option of setting the Event output signal polarity as either an active-low or active-high comparator output for thermostat operation, or as a temperature event interrupt output for microprocessor-based systems. The Event output can also be configured as a critical temperature output. This sensor has a 2-wire industry-standard SMBus and Standard mode I2C compatible (100 kHz bus clock) serial interface protocol, allowing up to eight sensors to be controlled in a single serial bus. These features make the MCP9805 ideal for sophisticated multi-zone temperature-monitoring applications. Typical Applications • • • • Dual In-line Memory Module (DIMM) Personal Computers (PCs) and Servers Hard Disk Drives and Other PC Peripherals General Purpose Temperature Sensor Typical Application Memory Module Memory Temperature Sensor MCP9805 Package Types MCP9805 8-Pin DFN (2x3) A0 1 A1 2 A2 3 GND 4 8 VDD 7 Event 6 SCLK 5 SDA SPD* EEPROM R 8-Pin TSSOP R A0 1 A1 2 A2 3 8 VDD 7 Event 6 SCLK 5 SDA 3.3 VDD_SPD SDA SCLK Event GND 4 * Serial Presence Detect © 2005 Microchip Technology Inc. DS21977B-page 1 MCP9805 www.DataSheet4U.com 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † VDD ....................................................................... 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 .....-40°C to +125°C Junction Temperature (TJ)................................ +150°C ESD protection on all pins (HBM:MM)....... (4 kV:200V) 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. DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground and TA = -20°C to +125°C. Parameters Power Supply Operating Voltage Range Operating Current Shutdown Current Power-On Reset Threshold (POR) Power Supply Rejection VDD IDD ISHDN VPOR PSRDC PSRAC Temperature Sensor Accuracy Accuracy with 0.25 °C/LSb Resolution: +75°C to +95°C +40°C to +125°C -20°C to +125°C TA = -40°C Internal ΔΣ ADC Conversion Time (10-bits + Sign): 0.25 °C/LSb Event Output (Open-Drain) High-Level Current (leakage) Low-Level Voltage Thermal Response Response Time (Note): DFN TSSOP Note: tRES tRES — — 0.7 1.5 — — s s Time to 63% of +22°C (Air) to +125°C (Oil Bath) IOH VOL — — — — 1 0.4 µA V VOH = 3.6V IOL= 3 mA tCONV — 65 125 ms 17 samples/sec. (typ.) TACY TACY TACY TACY -1.0 -2.0 -3.0 — ±0.5 ±1.0 ±2.0 ±2 +1.0 +2.0 +3.0 — °C °C °C °C Active Temp. Range Monitor Temp. Range 3.0 — — — — — — 200 0.1 2.2 ±0.3 ±0.5 3.6 500 2 — — — V µA µA V °C °C VDD = 3.3V + 150 mVpp (0 to 1 MHz), TA = +25°C Continuous Operation Shutdown Mode VDD Falling Edge Sym Min Typ Max Unit Conditions Thermal response with 1x1 inch dual-sided copper clad. DS21977B-page 2 © 2005 Microchip Technology Inc. MCP9805 www.DataSheet4U.com DIGITAL INPUT/OUTPUT PIN CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, VDD = 3.0V to 3.6V, GND = Ground and TA = -20°C to +125°C. Parameters Input High-Level Voltage Low-Level Voltage Input Current Output (SDA) Low-Level Voltage High-Level Current (leakage).


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