TCN75A 2-Wire Serial Temperature Sensor Features: Description: Temperature-to-Digital Converter Microchip Technology Inc.s TCN75A digital tempera- ture sensor converts temperatures between -40C and Accuracy: +125C to a digital word, with 1C (typ.) accuracy. - 1 (typ.) from -40C to +125C The TCN75A product comes with user-programmable - 2C (max.) from +40C to +125C registers that provide flexibility for temperature-sensing User-selectable Resolution: 0.5C to 0.0625C applications. The register settings allow user-select- Operating Voltage Range: 2.7V to 5.5V able, 0.5C to 0.0625C temperature measurement 2 2-wire Interface: I C Compatible resolution, configuration of the power-saving Shutdown Operating Current: 200 A (typ.) and One-shot (single conversion on command while in Shutdown) modes and the specification of both Shutdown Current: 2 A (max.) temperature alert output and hysteresis limits. When Power-saving One-shot Temperature the temperature changes beyond the specified limits, Measurement the TCN75A outputs an alert signal. The user has the Available Packages: MSOP-8, SOIC-8 option of setting the alert output signal polarity as an active-low or active-high comparator output for thermo- Typical Applications: stat operation, or as temperature event interrupt output for microprocessor-based systems. Personal Computers and Servers 2 Hard Disk Drives and Other PC Peripherals This sensor has an industry standard 2-wire, I C compatible serial interface, allowing up to eight devices Entertainment Systems to be controlled in a single serial bus. These features Office Equipment make the TCN75A ideal for low-cost, sophisticated Data Communication Equipment multi-zone temperature-monitoring applications. General Purpose Temperature Monitoring Package Types Typical Application 8-Pin SOIC, MSOP V DD SDA 1 V 8 DD SCL 2 7 A0 PIC R R PULL-UP ALERT 3 Microcontroller 6 A1 V DD SDA GND 4 5 A2 V 1 SDA DD 8 SCL SCL A0 I/O Ports 2 7 ALERT 3 ALERT A1 6 GND 4 A2 5 TCN75A 2006 Microchip Technology Inc. DS21935C-page 1 TCN75ATCN75A Notice: Stresses above those listed under Maximum 1.0 ELECTRICAL ratings may cause permanent damage to the device. This is CHARACTERISTICS a stress rating only and functional operation of the device at those or any other conditions above those indicated in the Absolute Maximum Ratings operational listings of this specification is not implied. Exposure to maximum rating conditions for extended periods V ....................................................................... 6.0V DD may affect device reliability. Voltage at all Input/Output pins .... GND 0.3V to 5.5V Storage temperature ..........................-65C to +150C Ambient temp. with power applied .....-55C to +125C Junction Temperature (T ).................................. 150C J ESD protection on all pins (HBM:MM)....... (4 kV:400V) Latch-up current at each pin ......................... 200 mA DC CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, V = 2.7V to 5.5V, GND = Ground, and DD T = -40C to +125C. A Parameters Sym Min Typ Max Unit Conditions Power Supply Operating Voltage Range V 2.7 5.5 V DD Operating Current I 200 500 A Continuous operation DD Shutdown Current I 0.1 2 A Shutdown mode SHDN Power-On Reset (POR) Threshold V 1.7 V V falling edge POR DD Power Supply Rejection C/ V 0.2 C/VV = 2.7V to 5.5V DD DD Temperature Sensor Accuracy T = -40C to +125C T -2 1 +2 C V = 3.3V A ACY DD Internal ADC Conversion Time: 0.5C Resolution t 30 ms 33 samples/sec (typ.) CONV 0.25C Resolution t 60 ms 17 samples/sec (typ.) CONV 0.125C Resolution t 120 ms 8 samples/sec (typ.) CONV 0.0625C Resolution t 240 ms 4 samples/sec (typ.) CONV Alert Output (Open-drain) High-level Current I 1 AV = 5V OH OH Low-level Voltage V 0.4 V I = 3 mA OL OL Thermal Response Response Time t 1.4 s Time to 63% (89C) RES 27C (air) to 125C (oil bath) DS21935C-page 2 2006 Microchip Technology Inc.