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ISL9123xIIx-EVZ Evaluation Board Manual
1.3
Evaluation Software Installation and Use
The ISL9123 evaluation software and evaluation software manual are available for download from the Renesas
website.
1. Save the evaluation software executable file and install the evaluation software (see the evaluation software
manual). When the evaluation software launches, (see the
supply, DC load, and other test equipment to the evaluation board; next, apply power.
2. The ISL9123/A/B has various control registers. See the ISL9123/A and ISL9123B datasheets for detailed
register descriptions.
3. Register RO_REG1 (Address: 0x02) provides chip identification information. The Get IC INFO_RO_REG1
button reads from this read-only register.
4. To change the output voltage, use the VSET Control slider in the VSET register (Address: 0x11) panel and
perform a Write REG operation. The output voltage ramps up at the slew rate specified in the DVSRATE setting
of CONV_CFG register. If the modified output voltage is lower than the initial value, its ramp down rate depends
on the applied load and output capacitance. The Read REG button provides the contents of the register, so
adjust the slider accordingly.
5. Register INTFLG_REG (Address: 0x03) contains the fault flags. The background color changes from green to
red: when (1) a fault occurs, and (2) this register is read using either the Check Fault button or the READ ALL
button. Each bit is set by a fault event and cleared when read. When the bit is cleared after reading, the
background color changes from red back to green.
6. Register CONV_CFG (Address: 0x12) contains crucial converter configuration bits. Selecting the Write (or
Read) button writes (or reads) the entire CONV_CFG register in one go.
7. Use EN_AND bit to disable the converter through I
Start enabled to Soft Start inhibit.
8. Selecting the Soft DSCHG enabled button presents a soft discharge resistor on the output pin, when the
converter is disabled through I
disabled button is selected. (ISL9123/B only)
9. Use the DVSRATE drop-down list to modify the dynamic voltage scaling rate for voltage ramp up, when output
voltage is modified using the VSET register.
10. Use the FMODE drop-down list to select one of the forced operating modes: Normal (Auto-PFM, default),
Forced PWM, and Forced Bypass (ISL9123/A only).
11. Use the CTRL Type drop-down list to select the control mode between Type I and Type II error amplifier.
12. Register INTFLG_MASK (Address: 0x13) contains additional features influencing the part behavior. Selecting
the Write (or Read) button writes (or reads) the entire INTFLG_MASK register in one go.
13. Use the OC_FAULT drop-down to select the over-current handling mechanism for the part.
14. Use the EN_OR drop-down list to enable a push-button ON functionality for the EN pin.
R16UZ0031EU0101 Rev.1.01
Jul 26, 2023
2
C by toggling the Soft Start EN_AND button from Soft
2
C using the EN_AND bit and VIN is still HIGH. By default, the Soft DSCHG
Setup and Configuration
and) connect the power
Page 5
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