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Application Note 1590
S = the Start condition, A = the Acknowledge, P = the
Enable the Output
When power is applied to the ISL95871C, the Charge
Current and Charge Voltage Registers are 0x0000 and
the output is disabled. The output is enabled by writing
valid, non-zero values to these 2 registers. See the
ISL95871C datasheet for valid values.
The ISL95871C is also disabled if the ACIN pin is below
3.2V. An Input voltage >13.1V will pull ACIN above 3.2V.
The minimum input voltage can be adjusted on the
evaluation board by changing R 6 or R 7 (see Figure 14).
Description of the User Interface Controls
and Display Information
Clicking the “Write All” button will write the indicated
SMBus sequences to Registers 14, 15, 3F and 44 in the
ISL95871C.
Note: The SMBus part of the ISL95871C and the USB
interface are powered by the 5V from the USB port on
the PC. It is not necessary to have other power
supplies connected to the evaluation board to read or
write to the ISL95871C.
Clicking on the “Read All” button will read all 6
registers in the ISL95871C and display the results in
the grey indicators below the Read All button.
If the device and the interface are operating normally,
the VendorID (reg FE) and the DeviceID (reg FF) will
display as follows:
If the VendorID (reg FE) and DeviceID (reg FF) remain
0000 it indicates a communication problem.
If the Visa resource name is blank, it indicates a
problem with the USB communication.
Clicking on the “RESET INTERFACE” button may
correct the problem. If not, try closing the software,
remove power and USB connections from the
evaluation board, then reconnect and restart.
Note the register contents are updated ONLY when the
Read All button is clicked.
The Write Charge Current Button sends only the
charge current to the ISL95871C. Other registers are
unchanged.
7
The small white window next to “Charge Current”
accepts inputs in Amps, and converts them the
hexadecimal (hex) value to be written to the
ISL95871C in the grey window. The hex value depends
on the value entered in Sense R. The value in the white
window will be forced to the nearest valid number that
can be produced by the DAC in the ISL95871C. That is,
after entering 4 and hitting the enter key, the display
will change to 3.968. After entering 4.1 and hitting the
enter key, the display will change to 4.096. The value
can be incremented and decremented with the
up/down arrows at the left of the window.
The Sense R inputs are used to calculate the hexadecimal
(hex) values and the SMBus sequences for the Charge
Current limit and Input Current limit entered in the white
boxes. The evaluation board is built with 10m Ω sense
resistors. If you change them to another value, enter the
new value to get correct calculations.
After entering a number in the white box, hitting the
enter key or clicking on another area will enter the
value and the resulting hex value and the SMBus
sequence will be calculated and displayed.
.
Stop condition.
Note: The LO byte is sent first. The HI byte is sent second.
When writing 0x41A0, 0xA0 is written first and 0x41 is
sent second.
Important Note: The SMBus commands are NOT
sent until one of the WRITE buttons is clicked
(i.e. Write All or Write Charge Current)
The Write Charge Voltage button writes only the Charge
Voltage register. Other registers are unchanged.
The small white window accepts Charge Voltage (in
Volts) and calculates the hexadecimal value and the
SMBus sequence to write to the ISL95871C. The
SMBus command is sent when the Write Charge
Voltage or Write All button is clicked. See Figure 10.
The Write Input Current button writes only the Charge
Voltage register. Other registers are unchanged. The
small white window accepts Input Current Limit in Amps
and calculates the hex value and the SMBus sequence to
be written to the ISL95871C. The Sense R input Is used
to calculate the hex value and the SMBus sequence. The
SMBus command is sent when the Write Input Current or
Write All button is clicked. See Figure 11.
The ISL95871C will shut down unless it receives Charge
Voltage or Charge Current commands every 175s. This is
a safety feature that prevents overcharging batteries if
bus master has stopped functioning. The software can
write all commands to the ISL95871C every 60s to
prevent the time-out. See Figure 12.
AN1590.0
November 4, 2010
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