TC77-3.3MCTTR Microchip

TC77 M Thermal Sensor with SPI Interface Features Description Digital Temperature Sensing in 5-Pin SOT-23A The TC77 is a serially accessible digital temperature and 8-Pin SOIC Packages sensor particularly suited for low cost and small form- factor applications. Temperature data is converted from Outputs Temperature as a 13-Bit Digital Word the internal thermal sensing element and made avail- SPI and MICROWIRE Compatible Interface able at anytime as a 13-bit twos compliment digital Solid State Temperature Sensing word. Communication with the TC77 is accomplished 1C (max.) accuracy from +25C to +65C via a SPI and MICROWIRE compatible interface. It has 2C (max.) accuracy from -40C to +85C a 12-bit plus sign temperature resolution of 0.0625C per Least Significant Bit (LSb). The TC77 offers a tem- 3C (max.) accuracy from -55C to +125C perature accuracy of 1.0C (max.) over the tempera- 2.7V to 5.5V Operating Range ture range of +25C to +65C. When operating, the Low Power TC77 consumes only 250 A (typ.). The TC77s Con- - 250 A (typ.) Continuous Conversion Mode figuration register can be used to activate the low - 0.1 A (typ.) Shutdown Mode power Shutdown mode, which has a current consump- tion of only 0.1 A (typ.). Small size, low cost and ease Typical Applications of use make the TC77 an ideal choice for implementing thermal management in a variety of systems. Thermal Protection for Hard Disk Drives and Other PC Peripherals Package Types PC Card Devices for Notebook Computers SOT-23-5 SOIC Low Cost Thermostat Controls Industrial Control V SI/O 1 DD CS 1 V DD Office Equipment SCK CS V SS TC77 TC77 Cellular Phones NC NC SCK SI/O Thermistor Replacement V NC SS Block Diagram Typical Application V DD V DD Internal TC77 Diode 0.1F Temperature Sensor V DD PICmicro TC77 Manufacturer MCU ID Register 13-Bit Sigma Delta A/D Converter CS AN0 CS Serial Port SI/O SCK SCK Interface Temperature SCK SI/O SDI Register V SS V SS Configuration Register 2002 Microchip Technology Inc. DS20092A-page 1TC77 1.0 ELECTRICAL PIN FUNCTION TABLE CHARACTERISTICS Name Function 1.1 Absolute Maximum Ratings SI/O Serial Data Pin SCK Serial Clock V ........................................................................6.0V DD V Ground SS All inputs and outputs w.r.t. V ..... -0.3V to V +0.3V SS DD CS Chip Select (Active-Low) Storage temperature ..........................-65C to +150C NC No Connection Ambient temp. with power applied .....-55C to +125C V Power Supply DD Junction Temperature......................................... 150C ESD protection on all pins: Human Body Model (HBM)..............................>4 kV Machine Model (MM)......................................>200V Notice: Stresses above those listed underMaximum Rating 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 operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. DC CHARACTERISTICS = 2.7V to 5.5V and Electrical Specifications: Unless otherwise noted, all parameters apply at V DD T = -55C to +125C. A Parameters Sym Min Typ Max Units Conditions Power Supply Operating Voltage Range V 2.7 5.5 V Note 1 DD Operating Current I 250 400 A Continuous Temperature DD Conversion Mode Power-On Reset Threshold V 1.2 1.6 2.2 V V falling or rising edge POR DD Standby Supply Current I 0.1 1.0 A Shutdown Mode DD- STANDBY Temperature to Bits Converter Resolution 13 Bits ADC LSb = 0.0625C/bit (Note 4) Temperature Conversion Time t 300 400 ms CT Temperature Accuracy T -1.0 +1.0 C +25C < T < +65C ERR A (Note 1) -2.0 +2.0 -40C < T < +85C A -3.0 +3.0 -55C < T < +125C A TC77-3.3MXX: V = 3.3V DD TC77-5.0MXX: V = 5.0V DD Note 1: The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V to 5.5V. However, the tem- perature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal operating voltages of 3.3V and 5.0V, respectively. As V varies from the nominal operating value, the accuracy may be DD degraded (Refer to Figures 2-6 and 2-7). 2: All time measurements are measured with respect to the 50% point of the signal. 3: Load Capacitance, C = 80 pF, is used for AC timing measurements of output signals. L 13 4: Resolution = Temperature Range/No. of Bits = (+255C -256C) / (2 ) Resolution = 512/8192 = 0.0625C/Bit DS20092A-page 2 2002 Microchip Technology Inc.