19-4771; Rev 1; 10/98 MAX769 Evaluation Kit Features The MAX769 evaluation kit (EV kit) provides a platform for evaluating the features of the MAX769. The MAX769 converts a 2-cell or 3-cell, 1.5V to 5.5V battery voltage to four separate output voltages. The main output voltage at OUT is digitally controlled from 1.8V to 4.9V in 100mV steps by a 3-wire SPI™ serial interface. OUT provides up to 80mA. The other outputs (REG1, REG2, and REG3) are low-noise linear-regulator outputs. The MAX769 contains numerous other features for two-way paging and other low-power wireless designs. Consult the MAX769 data sheet for details. The MAX769 EV kit is a fully assembled and tested surface-mount circuit board. ♦ 1.5V to 5.5V (buck-boost) Input Voltage The MAX847 is similar to the MAX769 except that it contains a boost DC-DC converter (for 1-cell inputs) rather than a buck-boost converter (for 2-cell or 3-cell inputs). To evaluate the MAX847, please order the MAX847EVKIT. ♦ Digitally Controlled 1.8Ω Switches for Vibrators, Beepers, and Other Low-Power Wireless Designs Ordering Information PART TEMP. RANGE MAX769EVKIT 0°C to +70°C ♦ 1.8V to 4.9V Digitally Adjustable Output Voltage ♦ Up to 80mA Total Output Current ♦ Three Low-Noise Voltage Regulators ♦ Charger for Small NiCd, NiMH, Lithium Battery, or Storage Capacitor ♦ 270kHz Switching Frequency ♦ 15µA Idle Mode™ Current ♦ Reset and Low-Battery Outputs ♦ Surface-Mount Components ♦ Fully Assembled and Tested IC PACKAGE 28 QSOP Component List DESIGNATION QTY C1, C2 2 DESCRIPTION 47µF, 16V low-ESR tantalum caps Sprague 593D476X0016E2W or AVX TPSD476M016R0150 C3, C8, C10, C12, C13, C15, C16 7 0.1µF ceramic capacitors C4 1 22nF ceramic capacitor C5, C9, C14 3 1µF ceramic capacitors C6, C7 2 10µF, 10V tantalum capacitors Sprague 595D106X0010A2T C11 1 1000pF ceramic capacitor D1 0 0.5A, 20V Schottky diode (optional) Motorola MBR0520L R1 1 15kΩ, 5% resistor R2, R3, R6, R8, R11, R13, R18, R22 8 R4, R7, R9, R10, R17, R19, R20, R23 8 DESIGNATION QTY R5 1 100kΩ, 5% resistor R12 1 390kΩ, 5% resistor R15 1 1MΩ, 5% resistor R14, R16 2 620kΩ, 5% resistors R21 1 10kΩ, 5% resistor L1 1 68µH inductor Sumida CD54-680 U1 1 MAX769EEI JU1–JU10 10 2-pin headers JU11 1 3-pin header JU12 1 4-pin header J1 1 6-pin header J2 1 25-pin, female, right-angle connector SW1–SW4 4 Slide switches Mouser 10SP001 LED1 1 Green light-emitting diode None 1 MAX847/MAX769 PC board None 1 MAX769 data sheet 1kΩ, 5% resistors 100kΩ, 5% resistors Idle Mode is a trademark of Maxim Integrated Products. SPI is a trademark of Motorola Corp. DESCRIPTION ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Evaluates: MAX769 General Description Evaluates: MAX769 MAX769 Evaluation Kit Component Suppliers PHONE FAX AVX SUPPLIER 803-946-0690 803-626-3123 CoilCraft 708-639-6400 708-639-1469 Coiltronics 561-241-7876 561-241-9339 Dale-Vishay 402-564-3131 402-563-6418 Motorola 602-303-5454 602-994-6430 Sprague 603-224-1961 603-224-1430 Sumida 708-956-0666 708-956-0702 Vishay/Vitramon 203-268-6261 203-452-5670 Note: Please indicate that you are using the MAX769 when contacting these component suppliers. Quick Start The MAX769 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Check the positions of jumpers JU1–JU12. See Table 2 and the MAX769 data sheet for details. Jumper connections for the MAX847 and MAX769 are not the same. 2) Check the positions of switches SW1–SW4. SW1–SW3 should be high (closest to the top edge of the evaluation board). When testing the MAX769, SW4 is not used and should be disconnected by leaving JU12-1 open. 3) Connect a +3V supply voltage to the BATT pad. The power-supply ground connects to the GND pad. 4) Connect a voltmeter and load, if any, to the OUT pad. Note that the MAX769 is designed to start in the low-power (COAST) mode—it cannot supply full load until RUN mode is set after start-up (by the serial interface). 5) Turn on the input power supply and verify that the output voltage is 3.0V. This is the MAX769’s starting OUT voltage. Other voltages can then be programmed via the serial interface (see MAX769 data sheet). 2 Manual Programming The MAX769 is designed to be controlled by a serial interface; however, slide-switches SW1–SW4 and LED1 are provided on the EV kit to assist in “bench-top” evaluation (Table 1). See the MAX769 data sheet for descriptions of the programmable features and for more information on serial programming. To manually program data into the device, start with SW1, SW2, and SW3 high. Then sequence through the following steps: 1) Set SW3 (CS) low. 2) Set the first desired data input bit with SW2. 3) Toggle the serial clock down and up with SW1. Data is loaded on the SCL rising edge. 4) Repeat steps 2 and 3 for each of the next seven input data bits (for a total of eight bits). 5) Set SW3 high. Connectors The MAX769 evaluation board contains provisions for two types of connectors for serial-interface connections. One is a 6-pin single in-line header (J1) that contains only serial-interface connections. The other is a DB-25 pad footprint (J2) that has serial connections along with other IC pin connections. Pin/pad connections are outlined in Tables 3 and 4. Table 1. Switch and LED Functions SWITCH/ LED SW1 FUNCTION COMMENTS Manual Serial Clock Input (SCL) SW2 Manual Serial Data Input (SDI) SW3 Manual Chip-Select Input (CS) SW4 This switch does not function with MAX769. SW4 is RUN/COAST selection on MAX847 only. LED1 Visual Data Output (SDO) Logic-high level is with switch pushed toward top of board. Logic-low level is with switch pushed toward switch label “SW1,” “SW2,” etc. LED on is logic-high output. _______________________________________________________________________________________ MAX769 Evaluation Kit JUMPER NUMBER MAX769 DEFAULT POSITION JU1 On JU1 should be inserted if no external synchronous clock is used. If an external synchronous clock is applied, then JU1 should be removed. JU2 On With JU2 inserted, the low battery input (LBI, LBO) is set to trip at 1V. With JU2 removed, LBI is set for 0.6V. JU2 should be removed when making no-load operating current measurements to prevent R12 and R14 from adding to the measured current. JU3 On With JU3 inserted, the reset input (RSIN, RSO) is set to trip at 1.6V. With JU3 removed, RSIN is set for 0.6V. JU3 should be removed when making no-load operating current measurements to prevent R15 and R16 from adding to the measured current. JU4 On JU4 connects a 100kΩ pull-up resistor (R17) from REG1 to the open-drain RSO output. JU4 can be removed if RSO is not used or if a different pull-up resistor is used. JU5 On JU5 connects a 100kΩ pull-up resistor (R10) from REG1 to the open-drain LBO output. JU5 can be removed if LBO is not used or if a different pull-up resistor is used. JU6 On JU6 connects an LED (LED1) to the serial data output (SDO). LED1 gives a visual indication of serial output data when manually programming the IC with SW1, SW2, and SW3. JU6 should be removed when using a µP-controlled interface, since the LED will not be visible at digital clock speeds. JU6 should also be removed when making operating or quiescent-current measurements. JU7 On JU7 connects SW1 to the serial clock input (SCL) (used to clock-in serial programming data). Insert JU7 when programming the IC manually with SW1, SW2, and SW3. Remove JU7 when using a digital serial interface at connector J1 or J2. JU8 On JU8 connects SW2 to the serial data input (SDI) (used to set serial programming data). Insert JU8 when programming the IC manually with SW1, SW2, and SW3. Remove JU7 when using a digital serial interface at connector J1 or J2. JU9 On JU9 connects SW3 to the chip-select input (CS) (used to activate the serial interface). Insert JU9 when programming the IC manually with SW1, SW2, and SW3. Remove JU9 when using a digital serial interface at connector J1 or J2. JU10 Off Remove JU10 when a MAX769 is used. JU10 connects SW4 to the RUN input (MAX847 only). JU11 JU11-1, JU11-2 JU11 has three pins to connect the REG2 input (REG2IN) to either REG1 (jumper J11-1 to J112) or OUT (jumper J11-2 to J11-3). JU12 JU12-2, JU12-3, JU12-1 (N.C.), JU12-4 (N.C.) COMMENTS JU12 has four pins. When the MAX769 is used, connect only jumper JU12-2 to JU12-3, leaving JU12-1 and JU12-4 open. When a MAX847 is inserted, connect jumper JU12-1 to JU12-2 and jumper JU12-3 to JU12-4. _______________________________________________________________________________________ 3 Evaluates: MAX769 Table 2. Jumper Selection Evaluates: MAX769 MAX769 Evaluation Kit Table 3. Connector Pinouts for J1 (6-Pin Header) Table 4. Connector Pinouts for J2 (DB-25) J1 PIN FUNCTION J2-PIN J1-1 REG1 Output Voltage J2-1 BATT J1-2 CS J2-2 REG1 J1-3 SDI J2-3 REG2 J1-4 SCL J2-4 REG3 J1-5 SDO J2-5 NICD GND J2-6 CS J2-7 N.C. (MAX769 only, RUN for MAX847) J2-8 SDO J1-6 FUNCTION J2-9 SDI J2-10 N.C. J2-11 N.C. J2-12 N.C. J2-13 N.C. J2-14 N.C. J2-15 RSO J2-16 LBO J2-17 N.C. J2-18 SCL J2-19 N.C. J2-20 N.C. J2-21 N.C. J2-22 N.C. J2-23 N.C. J2-24 GND J2-25 GND N.C. = No Connection 4 _______________________________________________________________________________________ DR2IN RSO RSI LBI LBO REG1 REG1 REG2 REG3 NICD CS RUN SDO J2-3 J2-4 J2-5 J2-6 J2-7 J2-8 100k R19 100k R17 N.C. N.C. J2-13 J2-14 RSO LBO N.C. N.C. J2-11 J2-12 J2-15 J2-16 1k JU6 DR2 J2-24 J2-25 J2-22 J2-23 J2-20 J2-21 J2-18 J2-19 J2-17 1k R18 DR1 REF CHO 0.1µF C12 R6 N.C. N.C. N.C. N.C. SCL N.C. JU8 1M R15 1k R3 1k R8 1k R2 1kΩ R11 R5 100Ω CS C3 0.1µF JU7 N.C. OUT SDI JU9 SDO SCL R4 100k BATT SW3 2 R7 100k SDI N.C. LED1 1 J2-9 J2-10 JU4 620k JU3 R14 0.1µF C13 620k R16 390k R12 2 R9 100k SW2 JU2 BATT REG1 JU5 2 1 J2-1 J2-2 REG1 REG1 R10 100k SW1 BATT 1 3 REG1 3 3 REG1 15 16 19 18 17 7 10 8 9 11 6 5 2 3 27 26 C1 47µF 16V C15 0.1µF AGND DRGND DR2 DR2IN DR1 RSO RSIN REF CH0 LBI LBO SCL SDI SDO CS BATT MAX769 U1 BATT REG3 REG2 R2IN OFS NICD REG1 OUT SYNC FILT PGND RUN LX1 20 21 22 14 23 24 25 13 12 4 28 1 L1 68µH C9 1µF C7 10µF 10V 0.1µF C10 1µF C14 C2 47µF 16V 1k R13 C6 10µF 10V C16 0.1µF C11 1nF JU1 JU10 C5 R1 15k REG3 REG2 OUT NICD OUT C4 22nF 1µF OUT C8 0.1µF RUN OPTIONAL REF D1 MBR0520L R22 1k JU12-4 JU12-3 JU12-2 JU12-1 3 2 JU11 1 100k R20 R21 10k SW4 2 R23 100k GND REG1 REG1 SDO SCL SDI CS REG1 SYNC 1 3 J1-6 J1-5 J1-4 J1-3 J1-2 J1-1 Evaluates: MAX769 GND MAX769 Evaluation Kit Figure 1. MAX769 EV Kit Schematic _______________________________________________________________________________________ 5 Evaluates: MAX769 MAX769 Evaluation Kit 1.0" Figure 2. MAX769 EV Kit Component Placement Guide—Component Side 6 _______________________________________________________________________________________ MAX769 Evaluation Kit Evaluates: MAX769 1.0" Figure 3. MAX769 EV Kit PC Board Layout—Component Side _______________________________________________________________________________________ 7 Evaluates: MAX769 MAX769 Evaluation Kit 1.0" Figure 4. MAX769 EV Kit PC Board Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.