MX884 IXYS High-Side Current Monitor With 10-Bit Serial Digital Output Features: General Description • • • • • • • The MX884 targets power management applications where high noise immunity and low cost are primary requirements. Its integrated 10-bit ADC provides high resolution, making it ideal for current monitoring systems. The MX884 enables digital power management, in which a microcontroller can readily monitor the current in a system and perform other control functions in power systems and motion control products. 3-60 V Operating Voltage Range Integrated 10-bit ADC 3 wire serial interface Microcontroller Compatible Low Power Minimum External Components TSOT-23 RoHS Compliant Package Applications: • • • • • The MX884 converts a small voltage developed across an external “current” sense resistor to a 10bit digital output. It features a wide common mode input supply voltage range of 3V to 60V and easily interfaces to most microcontrollers. The design is simple yet cost-effective, requiring very few external components, making it especially suitable for high volume applications. Lighting Management Current Shunt Measurement Remote Sensing Battery Monitoring Microprocessor Controlled Power Management Ordering Information Qty Part No. Description MX884HTTR 6L TSOT23 Tape & Reel 3,000 Functional Block Diagram Typical Application Circuit (1 Amp full scale) MX884 Drawing No. 088423 1 Preliminary 12/20/06 www.claremicronix.com IXYS MX884 Absolute Maximum Ratings TA = +25°C unless otherwise noted, Voltages with respect to GND = 0V Parameter Symbol Min Max IN Supply Voltage 70 LOAD 70 SCK, CS Input Voltage 6 SDO Open Drain Pull Up Voltage 6 Operating Temperature Range TA -40 +85 Storage Temperature Range TSTG -55 +150 Unit V V V V °C °C Absolute Maximum Ratings are stress ratings. Stresses in excess of these ratings can cause permanent damage to the device. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this data sheet is not implied. Exposure of the device to the absolute maximum ratings for an extended period may degrade the device and affect its reliability. Pin Description and Configuration Pin No. 1 2 3 4 5 6 Name SCK GND LOAD IN CS SDO Description Serial Clock Ground Load-Side Connection to the External Sense Resistor Positive Supply Terminal and Power Connection for the External Sense Resistor Chip Select (Active Low) Serial Data Output (Open Drain) DC Electrical Characteristics VIN = 5 V, T = +25°C Parameter Operating Voltage Range (VIN) Supply Current Condition Min 3 Typ Max 60 Unit V mA Average A/D Reading ILOAD=0 10 mV Sense Voltage 90 100 110 LSB Average A/D Reading 100 mV Sense Voltage 992 1000 1008 LSB Output Noise 0.25 CS 10nF parallel RS=10 ohm SCK pulse period 1.5 RMS LSB 5 µS 200 nS CS pulse period 100 µS CS falling to first SCK rising 200 nS Last SCK falling to CS rising 100 nS SCK pulse width SCK falling to SDO valid MX884 Drawing No. 088423 high or low SDO falling SDO rising 80 Depends on SDO R, C 2 Preliminary nS 12/20/06 www.claremicronix.com IXYS MX884 Functional Description The MX884 converts a small voltage developed across an external sense resistor (Rs) to a 10-bit digital output. Pin IN connects to the 3V to 60V power input. The external current sense resistor connects between pins IN and LOAD. The nominal A/D range is 100 mV V(IN)-V(LOAD) across Rs. The A/D least significant bit typically equals 0.1 mV across Rs. Inputs CS and SCK are TTL-level compatible, 5.5V maximum input voltage. Inputs can be driven from CMOS microcontrollers operating at supply voltages of 2.4 to 5.5V. Serial data output pin SDO is configured as open drain, maximum 5.5V external pull-up. SCK is used internally to clock the successive approximation register of the A/D. Serial Timing Diagram MX884 Drawing No. 088423 3 Preliminary 12/20/06 www.claremicronix.com IXYS MX884 TSOT-23 6 Lead IXYS Corporation makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifications and product descriptions at any time without notice. Neither circuit patent licenses nor indemnity are expressed or implied. Except as set forth in IXYS’ Standard Terms and Conditions of Sale, IXYS Corporation assumes no liability whatsoever, and disclaims any expressed or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. MX884 Drawing No. 088423 4 Preliminary 12/20/06 www.claremicronix.com IXYS World Wide Sales Offices IXYS Corporation 3540 Bassett Street Santa Clara, CA 925054 Tel: 1-408-982-0700 Fax: 1-408-496-0670 e-mail:[email protected] United Kingdom IXYS Semiconductor Limited Langley Park Way Langley Park Chippenham Wiltshire SN 15 1GE - England Tel: 44-1249-444524 Fax: 44-1249-659448 [email protected] Micronix An IXYS Company 145 Columbia Aliso Viejo, CA 92656-1490 Tel: 1-949-831-4622 Fax: 1-949-831-4628 Sales Offices ASIA / PACIFIC Asian Headquarters IXYS Room 1016, Chia-Hsin, Bldg II, 10F, No. 96, Sec. 2 Chung Shan North Road Taipei, Taiwan R.O.C. Tel: 886-2-2523-6368 Fax: 886-2-2523-6368 [email protected] [email protected] SALES OFFICES AMERICAS Eastern Region [Eastern North America, Mexico, South America] IXYS Corporation Beverly, MA Tel: 508-528-6883 Fax: 508-528-4562 [email protected] Central Region [Central North America] IXYS Corporation Greensburg, PA Tel: 724-836-8530 Fax: 724-836-8540 [email protected] Western Region [Western North America] IXYS Corporation Solana Beach, CA Tel: 858-792-1101 [email protected] http://www.claremicronix.com SALES OFFICES EUROPE European Headquarters IXYS Semiconductor GMBH Edisonstrasse 15 D- 68623 Lampertheim Germany Tel : 49-6206-503203 Fax: 49-6206-503286 [email protected] MX884 Drawing No. 088423 IXYS cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in this IXYS product. No circuit patent licenses nor indemnity are expressed or implied. IXYS reserves the right to change the specification and circuitry, without notice at any time. The products described in this document are not intended for use in medical implantation or other direct life support applications where malfunction may result in direct physical harm, injury or death to a person. Specification: MX884 ©Copyright 2006, IXYS Corporation All rights reserved. Printed in USA. 5 Preliminary 12/20/06 www.claremicronix.com