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19-1546; Rev 1; 12/99
MAX1667 Evaluation System
General Description
The MAX1667 evaluation system (EV system) consists of a MAX1667 evaluation kit (EV kit) and a companion Maxim SMBus(R) Interface Board. The MAX1667 EV kit simplifies evaluation of the MAX1667 chemistryindependent Level 2 smart battery charger. The Maxim SMBus interface board (MAXSMBUS) allows an IBM(R)-Compatible personal computer to use its parallel port to emulate an Intel(R) system management bus (SMBus) 2-wire interface. Windows(R) 95/98 software provides a user friendly interface to exercise the MAX1667's features. Order the MAX1667 EV system for complete IBM PCbased evaluation of the MAX1667. Order the MAX1667 EV kit if you already have an SMBus interface.
Features
o Charges Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc. o SMBus-Compatible 2-Wire Serial Interface o 4A, 3A, or 1A (max) Battery Charge Current o Up to 18.4V Battery Voltage o Up to +28V Input Voltage o Easy-to-Use Software Included o Proven PC Board Layout o Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX1667
Ordering Information
PART MAX1667EVKIT MAX1667EVSYS TEMP RANGE 0C to +70C 0C to +70C IC PACKAGE 20 SSOP 20 SSOP
Component List
DESIGNATION C1, C15 C2, C4, C5, C7, C11 C3 C6, C12 C8 C9 C10 C14, C17 D1, D4 D2, D3 JU1 L1 LED1 QTY 2 DESCRIPTION 33F, 25V low-ESR tantalum capacitors Sprague 594D336X0025D2T 0.1F ceramic capacitors 0.047F ceramic capacitor 22F, 35V low-ESR tantalum capacitors AVX TPSE226M035R0200 0.022F ceramic capacitor 1F, 50V ceramic capacitor Murata GRM42-2X7R105K050AB 1500pF ceramic capacitor 1F, 10V (min) ceramic capacitors 40V, 5A Schottky diodes Central Semiconductor CMSH5-40 Small-signal Schottky diodes Central Semiconductor CMPSH-3 3-pin header 33H, 5.5A inductor Coilcraft DO5022P-333 Red LED DESIGNATION N1 N2 5 1 2 1 1 1 2 2 2 1 1 1 P1 P2 R1 R2, R4, R7, R8 R3 R5, R6 R9 U1 None None None None None None QTY 1 1 1 1 1 4 1 2 1 1 1 1 1 1 1 1 DESCRIPTION 30V, 11.5A N-channel MOSFET Fairchild FDS6680 Small-signal N-channel MOSFET 2N7002 2 x 10 right-angle female header 5-element terminal block 40m 1%, 1W resistor Dale WSL-2512/40m/1% 10k 5% resistors 10k 1% resistor 33 5% resistors 1k 5% resistor MAX1667EAP Shunt (JU1) MAX1667 PC board MAX1667 data sheet MAX1667 EV kit data sheet MAX1667 EV kit software disk MAX1667 EV kit
None 1 MAXSMBus Component Suppliers Table appears at end of data sheet. Windows 95/98 are registered trademarks of Microsoft Corp. SMBus is a registered trademark of SBS Implementers Forum. IBM is a registered trademark of IBM Corp. Intel is a registered trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
MAX1667 Evaluation System Evaluates: MAX1667
Table 1. Required Equipment
EQUIPMENT An IBM PC-compatible computer A parallel printer port A standard 25-pin, straightthrough, male-to-female cable A DC power supply A standard smart battery pack or an electronic load DESCRIPTION Capable of running Windows 95/98 This is a 25-pin socket on the back of the computer. To connect the computer's parallel port to the Maxim SMBus Interface Board Capable of supplying +20V to +28V at 4A Capable of sinking 4A JU1
Table 2. Jumper Functions
JUMPER STATE 1-2* 2-3 Open FUNCTION SEL tied to VL, full-scale current set to 4A SEL tied to GND, full-scale current set to 1A SEL floating, full-scale current set to 3A
*Indicates default jumper setting.
2) Configure desired charger current using jumper JU1 (Table 2). Important: Do not turn on the power until all connections are made. 3) Connect a +20V to +28V DC power supply between the VIN pad and the adjacent GND pad on the MAX1667 EV kit board. 4) Connect a cable from the computer's parallel port to the SMBus interface board. Use a straight-through 25-pin female-to-male cable. To avoid damaging the EV kit or your computer, do not use a 25-pin SCSI port or any other connector that is physically similar to the 25-pin parallel printer port. 5) Install the MAX1667 EV kit software on your computer by running the INSTALL.EXE program on the floppy disk. This program copies the MAX1667 program file and creates an icon for it.
_________________________Quick Start
Before you begin, you will need the equipment listed in Table 1.
Procedure
See Figure 1, which is a diagram of the MAX1667 EV kit system, as you follow these steps: 1) Carefully connect the boards by aligning the 20-pin connector of the MAX1667 EV kit with the 20-pin header of the MAXSMBus interface board. Gently press them together. The two boards should be flush against each other.
TO PC PARALLEL PORT
MAXSMBUS
MAX1667 EVALUATION KIT VIN GND GND BATT
+ -
DC POWER SUPPLY
JU1 LED1 (+) C D T (-) (+) C D S (-)
SMART BATTERY
Figure 1. Functional Diagram 2 _______________________________________________________________________________________
MAX1667 Evaluation Kit Evaluates: MAX1667
Figure 2. MAX1667 EV Kit Software Command Panel
6) Turn on the power supply. Verify that LED1 turns on. 7) Start the MAX1667 program by opening its icon in the Start Menu. The EV kit software automatically detects the correct port by testing for the pin 5 to pin 13 loopback. Verify that LED1 turns off, signifying that communication between the PC and the MAX1667 has been established. 8) The software command panel should appear (Figure 2). Verify that Charging Voltage = 65535mV, Charging Current = 7mA; POWER_FAIL_MASK, HOT_STOP, and Enable Polling are checked; and the following checkboxes are checked in the Charger Status panel: VOLTAGE_NOTREG, VOLTAGE_OR, THERMISTOR_OR, THERMISTOR_COLD, and AC_PRESENT.
Detailed Description
Upon execution of the MAX1667 program, the software automatically resolves the SMBus address of the device. The software enables the command panel (Figure 2), after which the user may issue any of the allowed SMBus commands to the MAX1667. Refer to the MAX1667 data sheet for more information regarding the allowed SMBus commands.
Command Panel
ChargingVoltage() To issue the ChargingVoltage() command to the MAX1667, enter the desired voltage, in millivolts, into the Charging Voltage text edit box and select the adjacent [Send] button.
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MAX1667 Evaluation System Evaluates: MAX1667
Figure 3. MAX1667 EV Kit Smart Battery Window
ChargingCurrent() To issue the ChargingCurrent() command to the MAX1667, enter the desired current, in milliamperes, into the Charging Current text edit box and select the adjacent [Send] button. ChargerMode() To issue the ChargerMode() command to the MAX1667, select the checkbox beside one of the five available Charger Mode operations. Checkboxes in the Charger Mode panel of commands may be either checked or unchecked; the software writes a 0 to the MAX1667 in each bit position corresponding to operations that are unchecked, and writes a 1 in each bit position corresponding to checked operations. ChargerStatus() On the right-hand side of the command panel, locate the Enable Polling checkbox and the Charger Status panel. If the Enable Polling checkbox is checked (the default setting), the software automatically issues the ChargerStatus() command three times a second, in which case the checkboxes in the Charger Status panel are automatically updated and always represent the charger's current status. Unchecking the Enable Polling checkbox disables automatic software polling. If polling is disabled, the user can issue the ChargerStatus() command to the MAX1667 by selecting the [Charger Status] button, which is adjacent to the Enable Polling checkbox.
AlertResponse() The MAX1667 has an external interrupt pin that is polled by the software if the Enable Polling checkbox is checked. When an interrupt occurs, LED1 on the EV kit board illuminates. If polling is enabled, the software determines which event triggered the interrupt, clears the interrupt, and prints a diagnostic message in the Interrupts box. If polling is disabled and an interrupt occurs, the user can manually service the interrupt by selecting the [Alert Response] button. The Alert Response operation works as follows: The SMBus specification revision 1.0 describes an optional wired-OR signal called SMBALERT that, in a typical system, is connected to all the devices and then pulled up to VDD. A SLAVE device can use this signal to notify the bus MASTER that it wants to communicate. It does this by pulling the SMBALERT line LOW. When the MASTER sees the SMBALERT line go LOW, it knows that one of the SLAVE devices wants attention, but not which one. To determine which SLAVE pulled the SMBALERT line LOW, the MASTER broadcasts the Alert Response Address (0x18) to all of the SLAVE devices on the bus using a modified RECEIVE BYTE operation. The SLAVE device wanting to communicate with the MASTER responds with its SMBus address (0x13) during the second byte of the modified RECEIVE BYTE operation. AlarmWarning() To issue the AlarmWarning() command to the MAX1667, select the [Alarm Warning] button. This operation sends the AlarmWarning() command byte with a data word of 0x8000.
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_______________________________________________________________________________________
MAX1667 Evaluation System
Communication with a Smart Battery
If a Smart Battery is connected to the MAX1667 EV kit, the user may observe the status of the Smart Battery by selecting the [Battery] button. At this point, the Smart Battery window appears (Figure 3). If software polling of the charger's status is enabled, the software also automatically polls the status of the Smart Battery, and the parameters displayed in the Smart Battery window always represent the current status of the Smart Battery. If polling is disabled, the user can manually query the Smart Battery by selecting the [Update] button. When finished, select the [Done] button to return to the main MAX1667 user interface window.
Connecting an Electronic Load
If a Smart Battery is unavailable, an electronic load can be connected across the BATT and GND pads on the MAX1667 EV kit board. Make sure that the EV kit power is turned off before connecting a load. Connect the T pin to the (-) pin of P2 through a 10k resistor (this makes it appear to the MAX1667 as if a Smart Battery were connected to the socket). After the load is connected, program the load in voltage mode and set the electronic load to clamp at 5V. Turn on the power to the EV kit, and program the MAX1667 with a Charging Voltage of 12V at the maximum Charging Current (4A in the default case). Verify that the MAX1667 is supplying the maximum current to the load. Increase the electronic load clamp voltage in 1V increments, and verify that as the electronic load voltage crosses 12V, the MAX1667 transitions from current regulation to voltage regulation; as the electronic load voltage increases beyond 12V, the BATT voltage should remain fixed at 12V.
Evaluates: MAX1667
Serial Communications Interface
When the user issues a command, the MAX1667 software first determines the command byte; then, if the command is a Write-Word type, it determines the data word corresponding to the selected function. The software and MAX1667 device communicate serially via the MAXSMBus board. Refer to the MAX1667 data sheet for more information regarding the serial communications protocol.
Layout Considerations
The MAX1667 EV kit layout is optimized for fast switching and high currents. The traces connecting the power components must be able to carry at least 4A. Take care to ensure that C6 and C12 (the input capacitors), D1 (the rectifier diode), and C1 and C15 (the output capacitors) are all connected to GND at a common point, and to isolate the power GND from the quiet analog GND. Additionally, place the current-sense resistor as close to the IC as possible to keep the current-sense traces short, and use Kelvin connections to connect the current-sense resistor terminals to the CS and BATT pins of the IC. Because the SMBus communications line is especially susceptible to noise, the power components and SMBus signal traces are strategically placed on opposite sides of the PC board.
Detailed Description of Hardware
Selecting Maximum Output Current
The MAX1667 EV kit can be configured to provide a maximum of 1A, 3A, or 4A output current. Jumper JU1 sets the maximum current. See Table 2 for a description of the JU1 jumper settings. The EV kit is optimized for 4A of output current. If the maximum output current is set lower than 4A and a smaller inductor is desired due to board space or cost constraints, the following inductors are suggested for L1: for 3A, the Sumida CDRH127-330; for 1A, the Sumida CDR105B-330.
Connecting a Smart Battery
The MAX1667 EV kit includes a five-element terminal block to facilitate connecting the EV kit to a smart battery. Refer to the Smart Battery Specification to identify the type of smart battery connector suited to your application. Make sure that the EV kit power is turned off, and connect the (+), C, D, T, and (-) terminals across from the EV kit board to the smart battery connector using no more than 2 inches of wire. Attach a smart battery to the smart battery connector and turn the EV kit power back on. See Figure 1 if necessary.
SUPPLIER AVX Central Semiconductor Coilcraft Dale Fairchild Murata Sprague
Component Suppliers
PHONE 803-946-0690 516-435-1110 847-639-6400 402-564-3131 408-822-2000 814-237-1431 603-224-1961 FAX 803-626-3123 516-435-1824 847-639-1469 402-563-6418 408-822-2102 814-238-0490 603-224-1430
Note: Please indicate that you are using the MAX1667 when contacting the above component suppliers.
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Evaluates: MAX1667
VL
MAX1667 Evaluation System
Figure 4. MAX1667 EV Kit Schematic
JU1 1 2 3 6 SEL DCIN 9 REF VL VL THM U1 R5 33 C5 0.1F C17 1F C11 0.1F 3 C4 0.1F R3 10k 1% R4 10k 5 CCI R2 10k 4 CCV DHI 15 DACV LX LED1 INT DLO PGND 13 SCL CS 14 SDA AGND BATT 8 10 SDA 7 CS SDA 16 1 N2 2N7002 2 17 SCL 11 3 D1 CMSH5-40 L1 33H 19 C8 0.022F R9 1k INT R7 10k R8 10k 18 N1 FDS6680 C6 22F 35V C7 87 0.1F 65 C12 22F 35V C2 0.1F C3 0.047F BST 20 C10 1500pF 12 C9 1F 50V 2 IOUT 1 CS R6 33 D3 CMPSH-3 3 1
6 MAX1667
D2 CMPSH-3 3 1 D4 CMSH5-40 3 1 VIN LOAD R1 0.04 1W BATT BATT C1 33F 25V C15 33F 25V BATT SCL SDA THM GND P2-1 P2-2 P2-3 P2-4 P2-5 SCL INT LOAD
VL
REF
THM
+5V
P1-1
C14 1F
P1-2
P1-3
P1-4
P1-5
P1-6
P1-7
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P1-11
P1-20
MAX1667 Evaluation System Evaluates: MAX1667
1.0"
1.0"
Figure 5. MAX1667 EV Kit Component Placement Guide-- Component Side
Figure 6. MAX1667 EV Kit PC Board Layout--Component Side
1.0"
Figure 7. MAX1667 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7 (c) 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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