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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.

标记为完成:1.1 PCA9420 GUI Software Installation

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.

标记为完成:1.2 GUI Panels

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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

标记为完成:2.1 Board Description

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
J6	Voltage monitor		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
J7	Logic configuration for MODESEL0	[2-3]	Logic low
J8	Pullup configuration for MODE function	[1-2]	Pullup to external LDO output
J8	Pullup configuration for MODE function	[2-3]	Pullup to LDO2 output
J9	Logic configuration for MODESEL1	[1-2]	Logic high
J9	Logic configuration for MODESEL1	[2-3]	Logic low
J10	Pullup configuration for I/O voltage	[1-2]	Pullup to external LDO output
J10	Pullup configuration for I/O voltage	[2-3]	Pullup to LDO2 output
J11	Logic voltage configuration for INTB	[1-2]	Pullup to external LDO output
J11	Logic voltage configuration for INTB	[2-3]	Pullup to LDO2 output
J13	VDD configuration for external LDO	[1-2]	Pullup to USB input
J13	VDD configuration for external LDO	[2-3]	Pullup to VBAT
J14	NTC configuration	[1-2]	Pulldown to 100k
J14	NTC configuration	[2-3]	Pulldown to 10k

标记为完成:2.2 Jumper and Switch Definitions

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)

标记为完成:2.3 Connections

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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.

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
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
Reset: N.A
Functional View: By default, the GUI shows the “functional view”
Register Map View: Click this button to select the Register map view
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
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
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
Set/Read Setting: Set/Read the registers on the selected function tab
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
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
Regulator Status: Indicates the regulator status
PMIC Status: Indicates current PMIC Status, including selected output group, regulators output voltage setting and the linear charging status
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