
ISL94203EVKIT1Z 4. Using the GUI
AN1952 Rev.3.00 Page 12 of 43
May.9.19
4.1.5 FET Indicators
Above the voltage readings are the FET indicators, (see Figure 13). These show the status of the PCFET, CFET
and DFET control bits. If the bit is 1 indicating that the FET should be on, the indicator is green. If the bit is 0
indicating that the FET should be off, the indicator is red.
The FET indicators are more than just readouts. Clicking on the indicators can also set or clear the bits to turn on
or turn off the FETs. However, the GUI does not have control over the FETs when the device is operating in stand-
alone mode. To control the FETs through the GUI requires that the µCFET bit is set first. This bit is set or reset
using the µC Controls FET button in the µC Control Tab.
Above the FET control bits are some controls to change the operation of the device. These controls are PCFET
enable, CFET on during OV, and DFET on during UV.
Setting the PCFET enable to active causes the PCFET to turn on, instead of the CFET, when the voltage is below
the Low V Charge threshold voltage (see the Pack settings).
Setting the CFET on during OV to active means that the charge FET turns on when there is an overvoltage
condition, if the device detects a discharge current. This reduces heat generated in the CFET during discharge.
This is more important when there is a single charge/discharge path configuration.
Similarly, setting the DFET on during UV to active means that the discharge FET turns on when there is an
undervoltage condition, if the device detects a charge current. This reduces heat generated in the DFET during
charge. This is more important when there is a single charge/discharge path configuration.
4.1.6 Other Main Screen Controls
Communication to the device requires an I2C bus. The I2C bus uses a Slave byte to determine the specific device
on the bus that is being addressed. In the GUI this is set by the I2C Addr box (see Figure 14). This is located in
the lower left of the screen. By default, the Slave Byte is 50H (0101 000x). This addresses the device having the
ADDR pin pulled low. Applications where the ADDR pin is tied high are not supported.
Temperature measurement options are selected in this box (Figure 15) below the tabs. The pack settings and
temperature outputs can be shown as either volts or °C. Changing the setting initiates a voltage scan and an
update of the Pack Settings. The calculations are made in the GUI as described previously. The device simply
maintains the voltage value associated with the temperature.
This box also has the selection for the TGAIN bit. Clicking on the TGAIN box changes the TGAIN bit in the device,
updates all of the RAM settings for temperature limits and initiates an update of the Pack Settings tab. It does not
do a voltage scan. The caption shows the current status of the temperature gain. Figure 15 indicates that the
temperature gain is set to 2x.
Figure 13. FET Indicators
Figure 14. I2C Address Box
Figure 15. Temperature Measurement Options