Getting Started with the PF9453UK-EVK

This evaluation board features the PF9453 PMIC. The kit integrates all hardware needed to fully evaluate the PMIC and a communication bridge based on future technology devices international ltd (FTDI) to interface with the PF9453 GUI software interface to configure and control the PMIC.

2.1 Board Features

• Four Buck regulators:
• One 2.5 A BUCK regulator
• One 1.5 A BUCK regulator with DVS
• Two 1 A BUCK regulators
• Two Linear regulators:
• One 10 mA LDO
• One 250 mA LDO
• One 400 mA load switch with a built-in active discharge resistor
• 32.768 kHz Crystal oscillator driver and buffer output
• System features:
• 2.7 V to 5.5 V operating input voltage range
• Power ON/OFF control
• Standby/run mode control
• DVS control
• Interrupt configuration
• Fm+ 1 MHz I²C Interface (via FTDI USB to I²C cable)

2.2 Board Description

The figure helps to identify the different main sections on the board.

Figure 2. Evaluation Board Featured Component Locations

Figure 2. Evaluation Board Featured Component Locations

1. PF9453 PMIC (WLCSP package)
2. USB type C connector
3. VPWR and GND input power connectors
4. LDO1, LDO_SNVS, BUCK1 and BUCK2 sensing test points
5. LDO1, LDO_SNVS, BUCK1 and BUCK2 power test points
6. Digital signals jumper selectors
7. ADC Jumpers
8. BUCK3 and BUCK4 sensing test points, SDA and SCL PMIC, 32 kHz
9. BUCK3 and BUCK4 power test points
10. I²C headers and tests points
11. FTDI (I²C to USB IC)

3.1 Configure Hardware

Figure 3 shows the default jumper configuration of the board.

Figure 3. Evaluation Board Default Jumper Configuration

Figure 3. Evaluation Board Default Jumper Configuration

Table 1. Evaluation Board Jumper Descriptions.

Table 2. Evaluation Board Solder Joint Descriptions

Figure 4. PF9453 EVB Test Set Up

Figure 4. PF9453 EVB Test Set Up

Figure 4 shows the steps needed to power on the PF9453UK-EVK

See Figure 4 and follow the steps to test the PF9453UK-EVK board.Ensure that all jumpers are in their default positions before starting (see Figure 3).

1. Connect the positive terminal of the multimeter to TP22 BUCK2_S test point and the negative terminal of the multimeter to TP34 GND test point, see Figure 4 where step 1 is represented with the circle with number 1
2. Connect the USB -Type C to the PF9453 WLCSP-EVK. See that the green LED D401 is ON, see Figure 4 circle with number 2. Use the USB Type-C connector as the power supply with this configuration. Avoid connecting loads that may exceed its power capacity. For tests requiring higher current—such as efficiency measurements—use an external power supply. See Table 3 for setup instructions. If the USB Type-C supply is sufficient, proceed to the next step
3. Move the J508 to position J508 (1 to 2), see Figure 4, circle with number 3 (this turns on the PMIC by setting the high state the PMIC_ON_REQ pin)
4. Measure the default voltage of BUCK2 with the multimeter, it must be 0.85 V (default voltage)
5. The default power configuration can be checked without doing any hardware (HW) or software (SW) modifications. Check the default voltage configuration using a multimeter on BUCK1, BUCK2, BUCK3, BUCK4, LDO1 and LDO SNVS test points

Table 3. Table 6. Default voltage values

Board Documents

• PF9453UK-EVK Schematics
• PF9453UK-EVK Design Files

Additional References

In addition to our PF9453 Product description page, you may also want to visit:

• FRDM I.MX91S
• PF9453 QFN