STEVAL-IHT002V1

STEVAL-IHT002V1 Basic thermostat control board for cooling applications based on ST7LITEUS5 Data Brief Features ■ Capacitive power supply providing approximately 30 mA at 220 VAC 50 Hz ■ Temperature level regulation (potentiometer) ■ Temperature measurement input (external NTC 5k) ■ Zero voltage switching (ZVS) to synchronize the gate pulses with the mains ■ Stall rotor detection via AC switch temperature monitoring ■ ST7Ultralite 8-bit, 8-pin MCU running at 1 MHz (internal clock) ■ ICC programming connector STEVAL-IHT002V1 Description The STEVAL-IHT002V1 is a low-cost evaluation board designed to replace existing mechanical thermostats. While driving a compressor, the evaluation board is also capable of driving the RUN winding, replacing the PTC and directly driving the START winding. Stall rotor detection is also implemented. These functions are oriented towards reducing total power consumption. The evaluation board is based on the new low-cost, 8pin, 8-bit ST7Ultralite microcontroller (MCU), which controls the entire process. The MCU is equipped with programmable Flash memory, a 1 MHz internal clock source and runs 1 KB C-based software. Although the evaluation board is specially designed to drive small to mid-size compressors, it is fully customizable and adaptable to any other application where thermostat or temperature control is required. October 2007 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 Schematic Figure 1. +VDD R14 10K 1% P1 50K R2 12K 1% +VDD R3 5K R4 12K 1% NEUTRAL LINE J1 CON3 MAINS 1 2 3 C3 100nF 1 2 3 4 U1 ST7ULTRALITE VDD PA5/AIN4/CLKIN/ei4 D2 1N4007 D1 1N4007 VSS C5 1nF ei2/LTIC/AIN2/PA2 ei1/ICCCLK/AIN1/PA1 ei0/ICCDATA/ATPWM/AIN0/PA0 R1 47 1W Q1 BC337 R7 10K +VDD PA4/AIN3/MC0/ei3 C1 1uF 275~ X2 PA3/RESET R6 10K C4 10nF +VDD Neutral C6 47nF 275~ X2 Line 8 7 6 5 DZ1 5V6 1/2W R11 560K +VDD + R12 100K 1% R8 300 C2 1000uF 16V 105˚C G R13 100K +VDD COM OUT +VDD TR2 ACST67S L1 6.8uH +VDD R5 10K R9 300 R10* 47 3W 2 4 6 8 10 G 1 3 5 7 9 START RUN LINE +VDD J3 CON3 TR1 ACST67S J2 CON10A ICC Programmer +VDD COM OUT 3 2 1 2/4 Board schematic 1 STEVAL-IHT002V1 Board schematic STEVAL-IHT002V1 2 Revision history Revision history Table 1. Document revision history Date Revision 26-Oct-2007 1 Changes Initial release 3/4 STEVAL-IHT002V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. © 2007 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 4/4