Get Started with the PCA9420UK/PCA9420BS

Last Modified: 2019-10-08 09:31:56Supports PCA9420UK-EVM

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    Contents of this document

    Get Software

    1.1 PCA9420 GUI Software Installation

    Unzip the provided PCA9420 Evaluation Kit GUI installation execution file, follow the step by step instruction on the screen.

    During the installation process, the FTDI interface cable driver will also be installed, please refer to the screen capture for the reference. When correctly installed, the figure shown below on the right pop up on the screen. Click “Finish” button to continue.


    Once the installation finished, the GUI will be automatically launched. Please note that since the standalone evaluation board has not been powered up, no communication channel is established between the computer (GUI) via the interface cable to the evaluation board, and it shows “Disconnected” at the bottom left of the GUI.


    1.2 GUI Panels

    When the GUI is launched, it looks for a PCA9420UK/PCA9420BS target board connected via the USB cable. If connected, the GUI panels display “Connected” on the bottom left.

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    2.1 Board Description

    Following figures describe the main elements on the board.



    Number Name Description
    1 USB Input USB power supply for the PCA9420UK
    2 Logic pin for
    MODESEL1 and 2    		 Logic high or low for MODESEL1 and 2 pins
    3 VBAT-TS TS selection pin for either 10k or 100k
    4 System Node Electronic load for system
    5 U1 PCA9420UK PMIC
    6 VBAT_BKUP Coil cell battery for back-up purpose
    7 VBAT Connect a Li-ion battery cell
    8 SW2_OUT BUCK2 output
    9 SW1_OUT BUCK1 output
    10 LDO2_OUT LDO2 output
    11 LDO1_OUT LDO1 output
    12 INT-PU Interrupt pull-up to either LDO2 output or an external
    LDO output
    13 PMIC-OUT All regulators’ output
    14 SW1 Button connected to ON pin
    15 I2C-PU Logic voltage selection for I2C
    16 MODE-PU Logic voltage selection for MODESEL0 and 1 function
    17 FTDI-CTRL I2C interface
    18 VREG_IN Input selection for an external LDO between VBAT and
    USB input

    2.2 Jumper and Switch Definitions

    Following figures show the location of jumpers and switch on the evaluation board.



    The next table describes the function and settings for each jumper and switch.

    Jumper/
    Switch    		 Description Setting Connection/Result
    SW1 ON Open Connect ON pin to ground when
    pressed. Causes wake-up event of
    PMIC
    J5 FTDI-CTRL I2C interface connection with FTDI cable.
    Orange color for SCL, Yellow and Green
    color for SDA
    J6 Voltage monitor Measure voltages for PCA9420UK
    1: VBAT
    2: BUCK2 output
    3: BUCK1 output
    4: LDO2 output
    5: LDO1 output
    Measure voltages for PCA9420BS
    1: BUCK1 output
    3: VBAT
    5: LDO2 output
    7: LDO1 output
    9: BUCK2 output
    J7 Logic configuration for
    MODESEL0    		 [1-2] Logic high
    [2-3] Logic low
    J8 Pullup configuration for
    MODE function    		 [1-2] Pullup to external LDO output
    [2-3] Pullup to LDO2 output
    J9 Logic configuration for
    MODESEL1    		 [1-2] Logic high
    [2-3] Logic low
    J10 Pullup configuration for I/O
    voltage    		 [1-2] Pullup to external LDO output
    [2-3] Pullup to LDO2 output
    J11 Logic voltage configuration
    for INTB    		 [1-2] Pullup to external LDO output
    [2-3] Pullup to LDO2 output
    J13 VDD configuration for
    external LDO    		 [1-2] Pullup to USB input
    [2-3] Pullup to VBAT
    J14 NTC configuration [1-2] Pulldown to 100k
    [2-3] Pulldown to 10k

    2.3 Connections

    Connect wires on the following pins as shown in the next figure, and make sure the power supply is turned off during the wiring stage:

    • A Li-ion battery – Connect to VBAT test point
    • VIN Input – Powered by USB Micro B connector
    • FTDI Connector – Connect to FTDI USB to I2C cable (Yellow/Green to SDA, Orange to SCL, and Black to GND)

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    3.1 The GUI Quick Guide

    As shown in the next Figure, the GUI is a user-friendly tool which allows access to the on-chip registers to perform write/read commands manually or automatically (depending on GUI setting). Below is a quick guide of the key blocks that the GUI provides.


    1. Write All Registers: Click the write button on the GUI to perform a “write” command to all registers on PCA9420UK/PCA9420BS based on the current GUI setting. It is recommended to disable auto refresh before clicking the write all command, since some of settings might be updated by the auto refresh if turned on
    2. Read All Registers: Click the read button on the GUI to perform a “read” command and update all the register values reflected on the GUI
    3. Reset: N.A
    4. Functional View: By default, the GUI shows the “functional view”
    5. Register Map View: Click this button to select the Register map view
    6. Auto Refresh: Sets the auto refresh timer for the Interrupts and Status registers

      By choosing different options from the drop-down menu, the GUI performs the backend automatic read and refresh functions accordingly.

      • 1/second – Read all registers 1 time per second (1Hz)
      • 2/second – Read all registers 2 times per second (2Hz)
      • 4/second – Read all registers 4 times per second (4Hz)
      • Disabled – Disable the auto read
    7. Device information: It shows the device ID, device revision and its follower address information. Note that the GUI selects the follower address configured on the evaluation automatically
    8. Function Selection Tab: All function related registers are grouped into eight different tabs including “Top level control”, “Interrupts”, “Charging Control”, “Charging Status” and “Group A-D setting”. Click the tab to access the related registers
    9. Set/Read Setting: Set/Read the registers on the selected function tab
    10. Interrupts: Related to register 0x01 (TOP_INT), 0x02 (SUB_INT0), 0x04 (SUB_INT1) and 0x06 (SUB_INT2). When related events happen, the unmasked interrupt bits are set and the GUI highlights the checkboxes and changes the background color to RED
    11. Clear Interrupt: Related to register 0x02 (SUB_INT0), 0x04 (SUB_INT1) and 0x06 (SUB_INT2). The clear interrupt button is used to CLEAR the interrupt bits. In the case multiple interrupts bits are set at the same time, the button clears all set interrupts bits
    12. Regulator Status: Indicates the regulator status
    13. PMIC Status: Indicates current PMIC Status, including selected output group, regulators output voltage setting and the linear charging status
    14. Connections Status: When valid communication between GUI and the hardware is established, it shows “connected”, otherwise it shows “disconnected”. The cable used is also shown at the right side of the connection status bar

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