General Description
The MAX1535D evaluation kit (EV kit) is an efficient,
multichemistry battery charger. It uses the Intel System
Management Bus (SMBus™) to control the battery reg-
ulation voltage, charger current output, and input cur-
rent-limit set point.
The MAX1535D EV kit can charge one, two, three, or
four series Li+ cells with a current up to 8A.
The MAX1535D evaluation system (EV system) consists
of a MAX1535D EV kit and the Maxim SMBUSMON
board. The MAX1535D EV kit includes Windows®95-/98-/
2000-/XP-compatible software to provide a user-friendly
interface.
Features
♦0.5% Battery Voltage Accuracy
♦3% Battery Charge-Current Accuracy
♦Input Current-Limiting Set Point through SMBus
Command
♦Up to 8A Battery Charge Current
♦Automatic Selection of System Power Source
♦+8V to +25V Input Voltage Range
♦Charges Li+, NiCd, NiMH Battery Chemistries
♦SMBus-Compatible 2-Wire Serial Interface
♦Includes Windows 95-/98-/2000-/XP-Compatible
Software and Demo PC Board
♦Fully Assembled and Tested
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
________________________________________________________________ Maxim Integrated Products 1
19-3924; Rev 0; 1/06
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.
PART TEMP
RANGE
IC
PACKAGE
SM B u s
I N T ER F A C E
T YPE
M A X1 5 3 5 D EVK I T
0°C to + 70°C 32 Thi n QFN
( 5m m x 5m m )
—
M A X1 5 3 5 D EVSYS
0°C to + 70°C 32 Thi n QFN
( 5m m x 5m m )
SMBUSMON
Ordering Information
SUPPLIER PHONE FAX WEBSITE
AVX 843-946-0238 843-626-3123 www.avxcorp.com
Diodes Inc. 805-446-4800 805-446-4850 www.diodes.com
International Resistive Co. (IRC)
361-992-7900 361-992-3377 www.irctt.com
Kemet 864-963-6300 864-963-6322 www.kemet.com
Murata 770-436-1300 770-436-3030 www.murata.com
ON Semiconductor 602-244-6600 602-244-4545 www.onsemi.com
Sumida 847-545-6700 847-545-6720 www.sumida.com
Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com
TDK 847-803-6100 847-390-4405 www.component.tdk.com
Vishay 402-564-3131 402-563-6296 www.vishay.com
Component Suppliers
SMBus is a trademark of Intel Corp.
Windows is a registered trademark of Microsoft Corp.
Note: Indicate you are using the MAX1535D when contacting these manufacturers.
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
2_______________________________________________________________________________________
Component List
DESIGNATION
QTY
C6, C8, C10
DESIGNATION QTY DESCRIPTION
D1 1
0.5A, 30V Schottky diode (SOD123)
Diodes Inc. B0530W
Vishay Semiconductors MBR0530
ON Semiconductor MBR0530
D2 0 Not installed
J1 1 2 x 10 right-angle female receptacle
J2 1 Smart-battery header assembly,
right angle, keyless, five position
JU1, JU2, JU3 0 Not installed
L1 1 4.3µH, 11A, 11.4mΩ inductor
Sumida CEP125-4R3MC-U
N1 1
13.5A, 30V n- channel M OS FE T
( 8- p i n S O)
Fairchild FDS6670S
P1–P8 8
- 13A, - 30V p - channel M OS FE Ts
( 8- p i n S O )
Fai r chi l d FD S 6679Z
R1, R2 2
0.01Ω ± 1%, 1W sense r esi stor s ( 2512)
V i shay D al e W S L2512 0.010 1.0%
IRC LRC - LRF2512- 01- R010- F
R3 1 365kΩ ±1% resistor (0805)
R4 1 49.9kΩ ±1% resistor (0805)
R5 1 1MΩ ±5% resistor (0805)
R6, R7,
R16–R19 0 Not installed (0603)
R8 1 20kΩ ±5% resistor (0603)
R9–R12 4 10kΩ ±5% resistors (0805)
R13 1 33Ω ±5% resistor (0805)
R14, R15 0 Not installed
R20 1 5.1Ω ±5% resistor (0603)
R21 1 69.8kΩ ±1% resistor (0603)
R22 1 49.9kΩ ±1% resistor (0603)
R23 1 14.7kΩ ±1% resistor (0603)
R24 1 100kΩ ±1% resistor (0603)
R25 1 10Ω ±5% resistor (0603)
U1 1 MAX1535DETJ, 32-pin, 5mm x 5mm
thin QFN
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
_______________________________________________________________________________________ 3
Quick Start
Recommended Equipment
•DC source to supply the input current to the charger.
This source must be capable of supplying a voltage
greater than the battery-voltage set point and have
sufficient current rating.
•Voltmeter
•Smart battery
•Computer running Windows 95, 98, 2000, or XP
•9-pin serial extension cable
•SMBUSMON board
Procedure
The MAX1535D EV kit is a fully assembled and tested
board. Follow the steps below to verify board operation.
Do not turn on the power supply until all connec-
tions are completed. Observe all precautions on the
battery manufacturer’s data sheet.
1) Set the VPP jumper on the SMBUSMON board to
VCC5.
2) Carefully connect the boards by aligning the 20-pin
connector of the MAX1535D EV kit with the 20-pin
header of the SMBUSMON board. Gently press
them together.
3) Connect a cable from the computer’s serial port to the
SMBUSMON interface board. Use a straight-through
9-pin female-to-male cable.
4) Install the software by running the INSTALL.EXE
program. The install program copies the files and
creates icons for them in the Windows 95/98/2000/XP
start menu. An uninstall program is included with the
software. Click on the UNINSTALL icon to remove
the EV kit software from the hard drive.
5) Connect power to the SMBUSMON board.
6) Connect the input-current supply across the
ADAPTER_IN and PGND pads.
7) Connect a smart battery to connector J2.
8) Turn on the power supply.
9) Start the MAX1535D EV kit software.
10) Verify current is being delivered to the battery.
Detailed Description of Software
The MAX1535D program provides easy access to the
MAX1535D registers. It is also capable of reading the
registers of a smart battery and monitoring SMBus traffic.
Upon execution of the program, the software enables the
MAX1535D smart-charger command panel (Figure 1),
after which any of the allowed SMBus commands can
be sent to the MAX1535D. Refer to the MAX1535D data
sheet for more information regarding the allowed
SMBus commands.
Smart-Charger Command Panel
ChargeVoltage()
To issue the ChargeVoltage() command to the
MAX1535D, enter the desired voltage, in millivolts, into
the ChargingVoltage edit field and select the adjacent
Write button.
ChargeCurrent()
To issue the ChargeCurrent() command to the
MAX1535D, enter the desired current, in milliamps, into
the ChargingCurrent edit field and select the adjacent
Write button.
Auto Rewrite Checkboxes
The MAX1535D needs to receive a ChargeVoltage() or
ChargeCurrent() command every 175s (typ); otherwise,
the MAX1535D times out and terminates charging.
Usually, a smart battery sends these necessary com-
mands. However, when not using a smart battery with
the MAX1535D EV kit, select either (or both) of the Auto
Re-Write checkboxes located directly under the
ChargingCurrent and ChargingVoltage edit fields.
This generates a ChargeVoltage() or ChargeCurrent()
command at the selected time interval located on the
Timer panel.
ChargerMode()
To issue the ChargerMode() command to the
MAX1535D, select a combination of checkboxes in the
ChargerMode panel of commands. Each checkbox
represents a bit in the ChargerMode() command word.
Select the checkboxes next to the bits for which the
software should write a 1, unselect the checkboxes for
a 0. Send the command by selecting the Write button.
Note: To initiate charging, ensure the MAX1535D is
first reset by selecting bit 2 (POR_RESET) of the
ChargerMode register and click the Write button. Then
deselect bit 2 and click the Write button again. Next,
set the input current, charging current, and charging
voltage to the desired values.
ChargerStatus()
Charger status is shown in the ChargerStatus panel.
Each bit in the ChargerStatus() command word is shown
individually with a short description of the bit.
By default, the status is automatically read once every
two seconds. Disable this feature by unselecting the
Active Read: Charger checkbox located on the Timer
panel. Change the refresh time by entering a new value
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
4_______________________________________________________________________________________
into the Timer Interval edit box and select the Set
Interval button. When Auto Re-Write is disabled, issue
a ChargerStatus() command by selecting the Read but-
ton on the ChargerStatus panel.
ChargerSpecInfo()
ChargerSpecInfo() returns the Charger Specification
(0x0002) from the MAX1535D. This command is available
through the Other Bitmapped Charger Registers...
panel. Select ChargerSpecInfo by picking it from the
pulldown list located directly under the Other Bitmapped
Charger Registers... label. Issue a ChargerSpecInfo()
command by selecting the Read button. The returned
hexadecimal value is shown at the bottom of the panel.
AlarmWarning()
AlarmWarning is shown on the Other Bitmapped
Charger Registers... panel (Figure 2). Select Alarm
Warning by picking it from the pulldown list located
directly under the Other Bitmapped Charger
Registers... label. Each of the bits in the AlarmWarning()
command word are shown individually with a short
description of the bit and a checkbox. Select the check-
boxes next to the bits for which the software should write
a 1; unselect the checkboxes for a 0. Send the command
to the MAX1535D by selecting the Write button.
InputCurrent()
Input Current is shown on the Other Bitmapped
Charger Registers... panel (Figure 2). Select
InputCurrent by picking it from the pulldown list located
directly under the Other Bitmapped Charger
Registers... label. Each of the bits in the InputCurrent()
command word are shown individually with a short
description of the bit and a checkbox. Select the check-
boxes next to the bits for which the software should write
a 1; unselect the checkboxes for a 0. Send the com-
mand to the MAX1535D by selecting the Write button.
Note: The default input-current-limit setting at POR is
256mA. All codes requesting input current greater than
11.004A result in an input-current overrange, limiting
the input current to 11.004A.
ManufacturerID()
ManufacturerID() returns the Manufacturer ID (0x004D)
from the MAX1535D. This command is available through
the Other Bitmapped Charger Registers... panel (Figure
2). Select ManufacturerID by picking it from the pulldown
list located directly under the Other Bitmapped Charger
Registers... label. Issue a ManufacturerID() command by
selecting the Read button. The returned hexadecimal
value is shown at the bottom of the panel.
DeviceID()
DeviceID() returns the Device ID (0x0006) from the
MAX1535D. This command is available through the
Other Bitmapped Charger Registers... panel (Figure
2). Select DeviceID by picking it from the pulldown list
located directly under the Other Bitmapped Charger
Registers... label. Issue a DeviceID() command by
selecting the Read button. The returned hexadecimal
value is shown at the bottom of the panel.
Smart-Battery Command Panel
The software is capable of reading the registers of a
smart battery. The smart battery page of the software is
shown in Figure 3. The software only reads the registers
selected with checkmarks. By default, the registers are
automatically read once every two seconds. Disable this
feature by unselecting the Active Read: Battery check-
box located on the Timer panel. Change the refresh
time by entering a new value into the Timer Interval edit
box and select the Set Interval button. When Auto
Re-Write is disabled, read the battery by selecting the
Refresh button.
Detailed Description of Hardware
The MAX1535D includes all the functions necessary to
charge a smart battery. The EV kit is capable of charg-
ing with a maximum current of 8.064A and a maximum
voltage of 19.2V. For more information on the operation
of the MAX1535D, refer to the Detailed Description sec-
tion of the MAX1535D data sheet.
Connecting a Smart Battery
The MAX1535D EV kit includes a 5-pin smart battery
connector. To connect a smart battery to the EV kit, turn
off power to the EV kit and connect the battery, making
sure to correctly orient the connectors.
Evaluating the MAX1535D Above 25V
To evaluate the MAX1535D with an input voltage
greater than 25V (up to 28V), capacitors C1, C2, C13,
and C14 must be replaced with higher voltage-rating
parts. Any capacitors that were installed in locations
C11, C12, C19, and C20 must also meet the higher
voltage rating.
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
_______________________________________________________________________________________ 5
Figure 1. MAX1535D Smart-Charger Command Panel
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
6_______________________________________________________________________________________
Figure 2. MAX1535D Smart-Charger Command Panel Showing the Pulldown List for Charger Spec Info, Alarm Warning, Input
Current, Manufacturer ID, and Device ID
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
_______________________________________________________________________________________ 7
Figure 3. Smart-Battery Command Panel
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
8_______________________________________________________________________________________
ADDPWR_S
ADAPTER_IN
PGND
R3
365kΩ
1%
R4
49.9kΩ
1%
LDO
R5
1MΩ
R6
SHORT
R7
SHORT
R8
20kΩ
C3
0.01µF
C4
0.01µF
C5
0.01µF
VDD
VDD
THM
SDA
SCL
INT
AGND
SMBCLK
SMBALERT VDD
VDD
SMBDATA C24
3300pF
THM
R12
10kΩ
R11
10kΩ
R9
10kΩ
R10
10kΩ
C2
1µF
R25
10Ω
D1
C1
2.2µF
D2
OPEN
SRC
PDS PDS
3
1
2
65
78
4
1
32
P1
32 78
56
P2
1
4
PDSPDS
65
78
C6
0.1µF
REF
C7
1µF
11
R21
69.8kΩ
1%
45
R14
OPEN
REF
10
REF
18
R22
49.9kΩ
1%
9
R23
14.7kΩ
1%
R24
100kΩ
1%
R15
OPEN
17 REF
REF
C15
OPEN
C16
OPEN
C17
22µFC18
22µF
BATT-
BATT+
BATT+
R2
0.01Ω
1%
R19
SHORT
C22
OPEN
C21
OPEN R18
SHORT
3
21
N1
4
7
86
5
L1
4.3µH
DHI
4
P5
65 78
3
2
1
DHI 4
P6
65 78
3
2
1
C9
1µFR13
33Ω
R20
5.1Ω
C10
0.1µF
PLD
41
P7
65
3
2PLD 4
ADDPWR_D REVBLK_D
78
32
56
1
4
27
1
3
32
6
7
8
12
13
14
15
16
31 29
R16
SHORT
R1
0.01Ω
1%
C19
OPEN
C20
OPEN
R17
SHORT
28 25
SRC
C8
0.1µF
JU1
JU2
JU3
REVBLKS
C11
OPEN
C12
OPEN
C13
22µF
C14
22µF
LOAD
3
2
78 65
P8
78
BATT+
30
2
24
26
23
22
21
20
19
MAX1535D
U1
ACOK
PDL
DHIV
CSSN
CSSP
PDS
SRC
DCIN
ACIN
ACOK
CCS
CCI
CCV
VDD
THM
SDA
SCL
INT
DAC REF GND GND IMAX VMAX
I.C.
BATT
CSIN
CSIP
PGND
DLO
LDO
DLOV
DHI
P4
P3
4
LDO
1
VDD
Figure 4. MAX1535D EV Kit Schematic
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
_______________________________________________________________________________________ 9
BATT+
J2-1
J2-6
BATT-
THM
SMBDATA
SMBCLK
J2-2
J2-7
J2-3
J2-8
J2-4
J2-9
J2-5
J2-10
SMART BATTERY
CONNECTOR
J1-1
J1-3
J1-5
J1-7
J1-9
J1-11
J1-13
J1-15
J1-17
J1-19
N.C.
N.C.
N.C.
SMBALERT
N.C.
SMBCLK
SMBDATA
VDD J1-2
J1-4
J1-6
J1-8
J1-10
J1-12
J1-14
J1-16
J1-18
J1-20 N.C.
20-PIN HEADER
J1 J2
Figure 5. MAX1535D EV Kit Schematic—Smart Battery Connector
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
10 ______________________________________________________________________________________
Figure 6. MAX1535D EV Kit Component Placement Guide—Component Side
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
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Figure 7. MAX1535D EV Kit PC Board Layout—Component Side
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
12 ______________________________________________________________________________________
Figure 8. MAX1535D EV Kit PC Board Layout—VDD and Power Ground Plane
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
______________________________________________________________________________________ 13
Figure 9. MAX1535D EV Kit PC Board Layout—Ground Plane
Evaluate: MAX1535D
MAX1535D Evaluation Kit/
Evaluation System
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Figure 10. MAX1535D EV Kit PC Board Layout—Solder Side