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Application Note 1404

5

AN1404.2

June 27, 2011

Enable the Output

When power is applied to the ISL88731(C), 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 ISL88731(C) datasheet for 
valid values.
The ISL88731(C) 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

or R

7

 (see Figure 10).

Description of the User Interface Controls 
and Display Information

Clicking the “Write All” button will write the indicated SMBus 
sequences to Registers 14, 15 and 3F in the ISL88731(C).

Clicking on the “Read All” button will read all 5 registers in the 
ISL88731(C) 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 in the user interface are updated 
ONLY when the “Read All” button is clicked.

The “Write Charge Current” button sends only the charge current 
command to the ISL88731(C). Other registers are unchanged.

The small white window next to “Charge Current” accepts 
inputs in Amps, and converts them the hexadecimal (hex) 
value to be written to the ISL88731(C) 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 
ISL88731(C). 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.

.

S = the Start condition, A = the Acknowledge, P = the 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 ISL88731(C). The SMBus command is sent when 
the “Write Charge Voltage” or “Write All” button is clicked. See 
Figure 8.
The “Write Input Current” button writes only the Input Current 
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 
ISL88731(C). 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 9.
The ISL88731(C) 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 control software includes the function to write 
the Charge Current register every 60 seconds, which can be 
enabled or disabled as shown in Figure 6 and Figure 7.

FIGURE 6. ENABLE WRITING CHARGE CURRENT REGISTER EVERY 

60 SECONDS

FIGURE 7. DISABLE WRITING CHARGE CURRENT 

REGISTER EVERY 60 SECONDS

Содержание ISL88731CEVAL2Z

Страница 1: ...lf extracting archive file ISL88731_v3 0_Installer exe available for download from www Intersil com Note The National Instruments Runtime Engine must be installed before connecting the evaluation boar...

Страница 2: ...note of the location of the folder You will need to direct the New Hardware Wizard to this folder for the driver Software Installation Both the ISL88731 C control program and the National Instruments...

Страница 3: ...ort of your PC Note The SMBus part of the ISL88731 C and the USB SMBus 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 eva...

Страница 4: ...Application Note 1404 4 AN1404 2 June 27 2011 Figure 5 shows a screen shot of the ISL88731 C control software user interface FIGURE 5 ISL88731 C EVAL2Z CONTROL SOFTWARE SCREEN SHOT...

Страница 5: ...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 v...

Страница 6: ...lick on the RESET INTERFACE button If you still get no VISA resource name Close and restart the ISL88731 C control software If you still get no VISA resource name Open the Device Manager Control Panel...

Страница 7: ...1UF C6 100K R4 R2 10 R1 3 1 D1 0 1UF 0 047UF C9 10 R3 0 01 R5 TP11 0 01UF C3 10K R10 Q8 2 2 1 TP31 2 1 TP30 C1 3 2 1 4 8 7 6 5 Q11 C5 TP17 TP16 TP15 TP14 3 15 11 21 6 26 24 9 10 23 19 7 5 16 14 1 20...

Страница 8: ...27 28 29 30 31 32 1 2 3 4 5 U301 1 TP306 1 TP303 R307 R309 R399 1 TP300 1 TP301 1 TP302 1 8K 1 8K 0 VDDSMB SCL SDA SN65220DBV 1UF 0 1UF 1K 0 1UF 0 897 30 004 90 000 0 1UF 0 1UF 1K C8051F320 0 0 D D S...

Страница 9: ...lm Chip Resistor R17 H2511 004R7 1 16W5 4 7 GENERIC Thick Film Chip Resistor R18 H2511 00R00 1 16W 0 GENERIC Thick Film Chip Resistor R2 R4 H2511 01003 1 16W1 100k GENERIC Thick Film Chip Resistor R20...

Страница 10: ...Application Note 1404 10 AN1404 2 June 27 2011 ISL88731 C EVAL2Z Evaluation Board Layout FIGURE 12 TOP SILK SCREEN...

Страница 11: ...Application Note 1404 11 AN1404 2 June 27 2011 ISL88731 C EVAL2Z Evaluation Board Layout Continued FIGURE 13 TOP COPPER...

Страница 12: ...Application Note 1404 12 AN1404 2 June 27 2011 ISL88731 C EVAL2Z Evaluation Board Layout Continued FIGURE 14 LAYER 2 GROUNDS TOP VIEW...

Страница 13: ...Application Note 1404 13 AN1404 2 June 27 2011 ISL88731 C EVAL2Z Evaluation Board Layout Continued FIGURE 15 LAYER 3 GROUNDS TOP VIEW...

Страница 14: ...Application Note 1404 14 AN1404 2 June 27 2011 ISL88731 C EVAL2Z Evaluation Board Layout Continued FIGURE 16 BOTTOM COPPER BOTTOM VIEW...

Страница 15: ...ime without notice Accordingly the reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding For information regarding Intersil Corporation and its produc...

Страница 16: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Intersil ISL88731CEVAL2Z...

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