MAX1535B Datasheet, PDF (3/14 Pages) Maxim Integrated Products – MAX1535B Evaluation Kit/MAX1535B Evaluation System

MAX1535B Evaluation Kit/
MAX1535B Evaluation System
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 MAX1535B 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 MAX1535B 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 MAX1535B EV kit software.
10) Verify current is being delivered to the battery.
Detailed Description of Software
The MAX1535B program provides easy access to the
MAX1535B 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
MAX1535B smart-charger command panel (Figure 1),
after which any of the allowed SMBus commands can
be sent to the MAX1535B. Refer to the MAX1535B data
sheet for more information regarding the allowed
SMBus commands.
Smart-Charger Command Panel
ChargeVoltage()
To issue the ChargeVoltage() command to the
MAX1535B, enter the desired voltage, in millivolts, into
the Charging Voltage edit field and select the adjacent
Write button.
ChargeCurrent()
To issue the ChargeCurrent() command to the
MAX1535B, enter the desired current, in milliamps, into
the Charging Current edit field and select the adjacent
Write button.
Auto Rewrite Checkboxes
The MAX1535B needs to receive a ChargeVoltage() or
ChargeCurrent() command every 175s (typ); otherwise,
the MAX1535B times out and terminates charging.
Usually, a smart battery sends these necessary com-
mands. However, when not using a smart battery with
the MAX1535B EV kit, select either (or both) of the Auto
Rewrite checkboxes located directly under the Charging
Current and Charging Voltage 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
MAX1535B, select a combination of checkboxes in the
Charger Mode 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.
ChargerStatus()
Charger status is shown in the Charger Status panel.
Each of the bits in the ChargerStatus() command word
are 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
into the Timer Interval edit box and select the Set
Interval button. When Auto Refresh is disabled, issue a
ChargerStatus() command by selecting the Read button
on the Charger Status panel.
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