Evaluates: MAX9921 19-4165 Rev 0 6/08 MAX9921 Evaluation Kit General Description Features The MAX9921 evaluation kit (EV kit) is a fully assembled 6V to 18V Operating Voltage Range, Survives 60V and tested PCB that demonstrates the capabilities of Two 2-Wire Hall-Effect Sensors on the Board the MAX9921 dual 2-wire Hall-effect sensor interface with diagnostics capability. The EV kit comes with the Three Output Status LED Indicators MAX9921AUB+ installed. Proven PCB Layout Fully Assembled and Tested Ordering Information PART TYPE MAX9921EVKIT+ EVKit +Denotes lead-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 0.01F 10%, 100V X7R ceramic JU1, JU2 2 5-pin, 4-way headers C1, C3 2 capacitors (0603) JU3JU7 5 2-pin headers TDK C1608X7R2A103K R1 1 63.4k 1% resistor (0603) C2, C4 0 Not installed, capacitors R2R5 4 100k 5% resistors (0603) 0.1F 10%, 100V X7R ceramic R6, R7, R8 3 240 5% resistors (0603) capacitors (0805) C5, C6, C7 3 Hall-effect switches TDK C2012X7R2A104K S1, S2 2 Allegro A1140EUA 1F 10%, 25V X5R ceramic C8 1 capacitor (0805) S3, S4 0 Not installed, switches TDK C2012X5R1E105K Automotive Hall-effect interface 2.2F 10%, 100V X5R ceramic U1 1 (10 MAX ) C9 1 capacitor (1812) Maxim MAX9921AUB+ TDK C4532X7R2A225K Automotive micropower linear U2 1 regulator (6 TDFN) 100V, 200mA diode (SOD123) D1 1 Maxim MAX6765TTLD2+ Central CMHD4448 U3 1 Triple-buffer gate (8 TSSOP) D2, D3 2 Green LEDs (0603) 7 Shunts D4 1 Red LED (0603) 1 PCB: MAX9921 Evaluation Kit+ J1 0 Not installed Component Suppliers SUPPLIER PHONE WEBSITE Central Semiconductor Corp. 631-435-1110 www.centralsemi.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX9921 when contacting these component suppliers. MAX is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX9921 Evaluation Kit Quick Start Table 1. MAX9921 EV KIT Jumper Descriptions (JU1-JU7) Recommended Equipment Before beginning, the following equipment is needed: JUMPER POSITION DESCRIPTION MAX9921 EV kit Emulates Hall input shorted to 1-2 One 6V to 18V DC power supply battery A magnet Demonstrates normal operation 1-3* with on-board Hall sensor JU1, JU2 Procedure 1-4 Emulates Hall input shorted to GND The MAX9921 EV kit is fully assembled and tested. Follow the steps below to verify board operation. 1-5 Evaluates other Hall sensors Caution: Do not turn on the power supply until all Open Emulates the open-circuit failure connections are made. 1-2* Outputs enabled JU3 1) Verify that all jumpers are in the default positions, as Open Outputs disabled shown in Table 1. Outputs reflect diagnostic 2) Connect the DC power supply between the 1-2 information MAX9921 EV kits VBAT and GND pads. JU4 Outputs reflect Hall sensor 3) Turn on the DC power supply. Open* information 4) Move the magnet in front of S1 and S2. Observe the 1-2* OUT1 with 100k pullup light change of the OUT1 and OUT2 LEDs on the JU5 EV kit board. Open OUT1 without pullup 1-2* OUT2 with 100k pullup Detailed Description of Hardware JU6 Open OUT2 without pullup The MAX9921 EV kit board provides a proven layout for 1-2* ERR with 100k pullup evaluating the MAX9921. The EV kit comes with JU7 Open ERR without pullup MAX9921AUB+ installed. *Default position. External Power Supply DIAG and OE Configuration The MAX9921 is powered by a user-supplied 6V to The MAX9921 EV kit uses JU3 and JU4 to configure the 18V DC power supply connecting between VBAT and MAX9921 DIAG and OE inputs, as shown in Table 1. GND. The MAX9921 EV kit board is not reverse- Refer to the MAX9921 IC data sheet for a detailed battery protected. description of the MAX9921 diagnostic information. During the emulation of the Hall input shorted to GND, the MAX9921 will draw substantial shorting current until Outputs, Related LEDs, and Jumpers the MAX9921 turns off the shorted input. The shorting The MAX9921 EV kit has three outputs: OUT1, OUT2, current can reach a peak of 60mA to 70mA and the and ERR. Each output has an LED to indicate its cur- entire event may last 0.5s. Many common regulated- rent status. All three outputs can be individually pulled lab power supplies will overshoot in response to a up with a 100k resistor, as shown in Table 1. Refer to large, short-term current pulse. When evaluating the the MAX9921 IC data sheet for a detailed description of short-to-GND fault, an unregulated supply is recom- OUT1, OUT2, and ERR outputs. mended, such as a wet-cell battery. Hall-Effect Sensors and Related Jumpers The MAX9921 EV kit has two Hall-effect sensors (A1140EUA). JU1 and JU2 provide a convenient way to evaluate the MAX9921 with different Hall-effect sensors and emulate different failure conditions, as shown in Table 1. 2 Evaluates: MAX9921