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MAX8731AEVKIT

MAX8731A Evaluation Kit/Evaluation System

Maxim Integrated 

MAX8731A Evaluation Kit/Evaluation System

Detailed Description of Software

The MAX8731A program provides easy access to the

MAX8731A 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 MAX8731A smart charger command panel (Figure

1), after which any of the allowed SMBus commands

can be sent to the MAX8731A. Refer to the MAX8731A

data sheet for more information regarding the allowed

SMBus commands.

Smart Charger Command Panel

ChargeVoltage()

To issue the ChargeVoltage() command to the

MAX8731A, enter the desired voltage in millivolts into

the 0x15 ChargingVoltage edit field and select the

adjacent Write button.

ChargeCurrent()

To issue the ChargeCurrent() command to the

MAX8731A, enter the desired current in milliamps into

the 0x14 ChargingCurrent edit field and select the

adjacent Write button.

Autorewrite Checkboxes

The MAX8731A needs to receive a ChargeVoltage() or

ChargeCurrent() command every 175s (typ); otherwise,

the MAX8731A times out and terminates charging.

Usually, a smart battery sends these necessary com-

mands. However, when not using a smart battery with

the MAX8731A EV kit, select either (or both) of the Auto

Re-Write checkboxes located directly under the 0x14

ChargingCurrent and 0x15 ChargingVoltage edit

fields. This generates a ChargeVoltage() or

ChargeCurrent() command at the selected time interval

located on the Timer panel.

InputCurrent()

Input current is shown on the Other Bitmapped

Charger Registers... panel (Figure 2). Select 0x3F:W

InputCurrent by choosing it from the pulldown list locat-

ed 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 zero. Send the com-

mand to the MAX8731A 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 MAX8731A. This command is available

through the Other Bitmapped Charger Registers...

panel (Figure 2). Select 0xFE:R 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 (0x0008) from the

MAX8731A. This command is available through the Other

Bitmapped Charger Registers... panel (Figure 2). Select

0xFF:R 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 2s. Disable this feature by

unselecting the Active Read: Battery 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 autorefresh is disabled,

read the battery by selecting the Refresh button.

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