Evaluates: MAX9934 19-5273 Rev 0 7/10 MAX9934T Evaluation Kit General Description Features The MAX9934T evaluation kit (EV kit) demonstrates S EV Kit Configured for Bidirectional Current the MAX9934T low-voltage, precision, current-sense Sensing Up to 1A amplifier for power management in portable consumer S EV Kit Configured for 250V/V Gain electronics. The devices precision inputs and the EV S Chip-Select (CS) Logic Input kits on-board, precision, low-value sense resistor allows the measurement of bidirectional (e.g., battery charge/ S -0.1V to +5.5V Input Common-Mode Range discharge) currents up to 1A. Input common-mode S +2.5V to +3.6V DC Power-Supply Operation range is -0.1V to +5.5V independent of supply. The S Proven PCB Layout device demonstrates a 25FA/mV fixed gain and the S Fully Assembled and Tested EV kit is configured for a 250V/V gain. The devices chip-select (CS) logic input allows users to multiplex several MAX9934T parts. The EV kit operates from a Ordering Information +2.5V to +3.6V, 100mA DC power supply. The EV kit can also be used to evaluate the MAX9934F PART TYPE current-sense amplifier. See the Evaluating the MAX9934F MAX9934TEVKIT+ EV Kit section for more information. +Denotes lead(Pb)-free and RoHS compliant. Selector Guide PART GAIN OUTPUT LOGIC PIN MAX9934T Current Chip-select input 25FA/mV MAX9934F 5FA/mV Current Chip-select input Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION 4.7FF Q10%, 16V X7R ceramic 10mI Q0.1%, Q15ppm/C C1 1 capacitor (0805) R1 1 4-terminal resistor (2512) Murata GRM219R71C475K Vishay Y14870R01000B9 0.1FF Q10%, 16V X7R ceramic 10kI Q0.1%, Q25ppm/C C2, C4, C5 3 capacitors (0603) R2 1 resistor (0603) Murata GRM188R71C104K Panasonic ERA-3YEB103V R3, R4 2 10kI Q5% resistors (0603) 0.01FF Q10%, 16V X7R ceramic C3 1 capacitor (0603) RS+, RS- 2 White miniature PCB test points Murata GRM188R71C103K Current-sense amplifier Not installed, ceramic capacitor (6 UCSPK) C6 0 U1 1 (0603) Maxim MAX9934TART+ GND 2 Black miniature PCB test points (Top Mark: AAF) GND, Black multipurpose PCB test Current-sense amplifier 2 OUT REF points M U2 1 (8 FMAX ) JU1, JU2, JU3 3 2-pin headers Maxim MAX9934TAUA+ OUT 1 Red multipurpose PCB test point 3 Shunts (JU1, JU2, JU3) PCB: MAX9934T EVALUATION 1 UCSP is a trademark and MAX is a registered trademark of KIT+ 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.MAX9934T Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Vishay 402-563-6866 www.vishay.com Note: Indicate that you are using the MAX9934 when contacting these component suppliers. 9) Connect the DVM positive terminal to the OUT PCB Quick Start pad and the negative terminal to the OUT REF PCB Required Equipment pad. U MAX9934T EV kit 10) Enable the power supplies and the electronic load. U +2.5V to +3.6V, 100mA DC power supply for VCC Any power sequence can be used without damage to U1 or U2. U +5.5V, 2A DC power supply 11) Verify that the DVM measures +2.5V. U 2A electronic load U One digital voltmeter (DVM) with 10MI input imped- Detailed Description of Hardware ance The MAX9934T EV kit demonstrates the MAX9934T low- Procedure voltage, precision, current-sense amplifier in a tiny 1mm The EV kit is fully assembled and tested. Follow the steps x 1.5mm, 3 x 2-bump UCSP package (U1) and an 8-pin below to verify board operation: FMAX package (U2). The EV kit can also be used to evaluate the MAX9934F current-sense amplifier. Contact 1) Verify that jumpers JU1, JU2, and JU3 shunts are the factory to obtain free samples. See the Evaluating the in-stalled as follows: MAX9934F section for more information. JU1: Installed (OUT REF PCB pad connected to The devices precision inputs measure very small GND PCB pad) sense voltages up to Q10mV full scale. The EV kit JU2: Not installed (U1 output enabled) features a precision, on-board, four-terminal surface- JU3: Installed (U2 output disabled high impedance) mount sense resistor, R1 (10mI Q0.1%, Q15ppm/NC). 2) Set the +2.5V to +3.6V, 100mA DC power-supply This enables measurement of bidirectional currents up to voltage to +3.3V and disable the output. 1A connected across the EV kits I RS+ and I RS- PCB pads. The input common-mode range is -0.1V to +5.5V 3) Set the +5.5V, 2A DC power-supply voltage to +5V, independent of VCC. The EV kit operates from a +2.5V the current limit above 1A, and disable the output. to +3.6V, 100mA DC power supply connected across the 4) Set the electronic load to 1A and disable the output. VCC and GND PCB pads. 5) Connect the low-power DC power-supply positive The devices 25FA/mV fixed-gain output current cre- terminal to the VCC PCB pad and the negative ter- ates an output voltage across the output-load resistor, minal to the nearby GND PCB pad. R2 (10kI Q0.1%), achieving a 250V/V gain. R2 can be 6) Connect the 2A DC power-supply positive terminal replaced with an appropriate surface-mount 0603 resis- to the I RS+ PCB pad and the negative terminal to tor to achieve different output gains. The EV kits output the GND PCB pad. voltage can be measured across the OUT and OUT REF PCB pads. Connect a 1.65V reference voltage across 7) Connect the 2A electronic load positive terminal to the OUT REF and GND PCB pads. The devices CS pin the I RS- PCB pad and the negative terminal to the allows users to multiplex several MAX9934T parts. GND PCB pad. Surface-mount 0603 capacitors C5 (installed) and C6 8) Set the DVM to measure voltage. (not installed) provide optional input filters. 2 Evaluates: MAX9934