NXP Semiconductors PCA9420UK-EVM User manual

UM11216
PCA9420UK-EVM evaluation board user manual
Rev. 1.2 — 11 March 2020 User manual
Document information
Information Content
Keywords PCA9420UK-EVM evaluation board
Abstract This user manual provides guidelines on how to use the PCA9420-EVM
evaluation board

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PCA9420UK-EVM evaluation board user manual
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User manual Rev. 1.2 — 11 March 2020
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Revision history
Revision history
Rev Date Description
v.1.2 20200311 Added Section 15; removed references to PCA9420BS
v.1.1 20191016 Updated Figure 6, Figure 7, Section 10
v.1 20190718 Initial version

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PCA9420UK-EVM evaluation board user manual
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1 PCA9420UK-EVM (WLCSP) Evaluation Board
Figure 1. PCA9420UK-EVM evaluation board

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PCA9420UK-EVM evaluation board user manual
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2 Kit contents/packing list
The kit contents include:
•Assembled and tested PCA9420UK-EVM evaluation board in an anti-static bag
•USB to MPSSE Serial cable for I2C communication
•USB 2.0 Cable
•Spare jumpers

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PCA9420UK-EVM evaluation board user manual
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3 Required equipment
To use this kit, the equipment needed is:
•1-cell Li-ion Battery
•5.0V power supply or USB with enough current capability (1.5A or above for maximum
performance)
•PCA9420 GUI installed on a Windows PC
•Multimeters to measure regulator outputs
•Oscilloscope (optional)
•USB enabled computer running Windows XP, Vista, 7, 8, or 10

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4 Device description
The PCA9420UK is a highly-integrated Power Management IC (PMIC), targeted to
provide a full power management solution for low power microcontroller applications
or other similar applications. The device consists of a linear battery charger capable
of charging up to 315 mA current. It has I2C programmable Constant Current (CC)
and Constant Voltage (CV) values for flexible configuration. Various built-in protection
features such as input overvoltage protection, overcurrent protection, thermal protection,
etc. are also provided for safe battery charging. It also features JEITA compliant
charging. The device also integrates two step-down (buck) DC/DC converters which
have I2C programmable output voltage. Both buck regulators have integrated high-side
and low- side switches and related control circuitry, to minimize the external component
counts; a Pulse-Frequency Modulation (PFM) approach is utilized to achieve better
efficiency under light load condition. Other protection features such as overcurrent
protection, under-voltage lockout (UVLO), etc. are also provided. By default, the input for
these regulators is powered by either VIN or VBAT, whichever is greater.
In addition, two on-chip LDO regulators are provided to power up various voltage rails in
the system.
Other features such as FM+ I2C interface, chip enable, interrupt signal, etc. are also
provided.
The chip is offered in 2.09mm x 2.09mm, 5 x 5 bump, 0.4mm pitch WLCSP package.

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5 Key features
•Linear battery charger for charging single cell li-ion battery
•20V tolerance on VIN pin
•Programmable input OVP (5.5V or 6V)
•Programmable constant current (up to 315 mA) and pre-charge low voltage current
threshold
•Programmable constant voltage regulation
•Programmable automatic recharge voltage and termination current threshold
•Built-in protection features such as input OVP, battery SCP, thermal protection
•JEITA compliant
•Battery attached detection
•Over-temperature protection
•Two step-down DC/DC converters with very low quiescent current
•Programmable output voltage
•SW1: core buck converter, 0.5V~1.5V output, 25mV/step, and a fixed 1.8V, up to
250mA
•SW2: system buck converter, 1.5V~2.1V/2.7V~3.3V output, 25mV/step, up to 500mA
•Low power mode for extra power saving
•Two LDOs
•Programmable output voltage regulation
•LDO1: always-on LDO, 1.70V~1.90V output, 25mV/step, up to 1mA
•LDO2: system LDO, 1.5V~2.1V/2.7V~3.3V output, 25mV/step, up to 250mA
•1 MHz I2C-bus slave interface
•-40°C ~ +85°C ambient temperature range

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6 Board description
Figure 2 describes the main elements on the board.
Figure 2. PCA9420UK-EVM board description
Table 1. Board description
Number Name Description
1 USB Input USB power supply for the PCA9420UK
2Logic pin for
MODESEL1&2 Logic high or low for MODESEL1&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

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Number Name Description
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&1 function
17 FTDI-CTRL I2C interface
18 VREG_IN Input selection for an external LDO between VBAT and
USB input

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7 Jumper and switch definitions
Figure 3 shows the location of jumpers and switch on the evaluation board.
Figure 3. Jumper and switch locations for PCA9420UK-EVM
Table 2 describes the function and settings for each jumper and switch.
Table 2. Jumper and switch definitions
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
[1-2] Logic high
J7 Logic configuration for
MODESEL0 [2-3] Logic low

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Jumper/
Switch Description Setting Connection/Result
[1-2] Pullup to external LDO output
J8 Pullup configuration for
MODE function [2-3] Pullup to LDO2 output
[1-2] Logic high
J9 Logic configuration for
MODESEL1 [2-3] Logic low
[1-2] Pullup to external LDO output
J10 Pullup configuration for I/O
voltage [2-3] Pullup to LDO2 output
[1-2] Pullup to external LDO output
J11 Logic voltage configuration
for INTB [2-3] Pullup to LDO2 output
[1-2] Pullup to USB input
J13 VDD configuration for
external LDO [2-3] Pullup to VBAT
[1-2] Pulldown to 100k
J14 NTC configuration [2-3] Pulldown to 10k

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8 Evaluation board connections
Figure 4. PCA9420UK-EVM connection
8.1 Connections
Connect wires on the following pins as shown in Figure 4, 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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9 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.
Figure 5. GUI Installation
•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.

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Figure 6. GUI overview
9.1 GUI panels
When the GUI is launched, it looks for a PCA9420UK-EVM target board connected via
the USB cable. If connected, the GUI panels display “Connected” on the bottom left.

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10 The GUI Quick Guide
As shown in Figure 7, 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.
Figure 7. GUI summary
1. Write All Registers: Click the write button on the GUI to perform a “write” command
to all the designated registers on PCA9420UK 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. 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
4. Device information: It shows the device ID, device revision and its slave address
information. Note that the GUI selects the slave address configured on the evaluation
automatically.
5. 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.
6. Set/Read Setting: Set/Read the registers on the selected function tab.
7. 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.
8. 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

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User manual Rev. 1.2 — 11 March 2020
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the case multiple interrupts bits are set at the same time, the button clears all set
interrupts bits.
9. 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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11 Evaluation Board Schematic
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Figure 8. PCA9420UK-EVM (WLCSP) evaluation board

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
UM11216 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 1.2 — 11 March 2020
18 / 26
12 Evaluation Board BOM List
Table 3. Bill of Materials (BOM)
Ref Description Size
(inch) Manufacture Part Number Notes
C18 CAP CER 0.1µF 50V 10% X7R 0402 MURATA GRM155R71H104KE14D
C3, C10, C17,
C19 CAP CER 1.0µF 16V 10% X7R 0603 MURATA GRM188R71C105KE15
C15 CAP CER 0.47µF 16V 10%
X7R AEC-Q200 0603 MURATA GCM188R71C474KA55D
C14, C16 CAP CER 10µF 10V 20% X7R 0603 MURATA GRM188Z71A106MA73
C4, C6 CAP CER 10.0µF 16V 10% X7R 0805 MURATA GRM21BZ71C106KE15
C1, C8, C20 CAP CER 2.2µF 16V 10% X7R 0603 MURATA GRM188Z71C225KE43
C2 CAP CER 4.7µF 16V 10% X7R 0603 MURATA GRM188Z71C475KE21
L1, L2 IND PWR 2.2µH@1MHz 2.5A
20% 2016 Samsung Electro
Mechanics CIGT201610EH2R2MNE
L3, L4 IND FER BEAD 330OHM@100MH
Z 2.5A 25% SMT TDK MPZ2012S331AT000
U1 PMIC NXP PCA9420UK_WLCSP25
U2 IC VREG LDO 1.8V 300mA
2-5.5V SOT23-5 TEXAS INSTRUM
ENTS TLV70218DBVT
R1 RES MF 20.0K 1/10W 1% 0603 BOURNS CR0603-FX-2002ELF
R2-R6 RES MF 10.0K 1/10W 1% 0603 YAGEO
AMERICA RC0603FR-0710KL
R7, R9 RES MF ZERO OHM 1/10W -- AE
C-Q200 0603 PANASONIC ERJ-3GEY0R00V
RT1 RES THERMISTOR NTC 100K@2
5 DEGC 100mW 1% 0402 MURATA NCP15WF104F03RC
SW1 SW SPST PB SMT 16V 20MA ALPS ELECTRIC
(USA) INC. SKRPABE010
BT1 BATTERY HOLDER SMD CR2025/
2032
Linx
Technologies BAT-HLD-001
TP11-TP14,
TP17-TP19
TEST POINT PC MULTI
PURPOSE BLK TH
KEYSTONE
ELECTRONICS 5011
TP1-TP10,
TP15,
TP16, TP20
TEST POINT PC MULTI
PURPOSE RED TH
KEYSTONE
ELECTRONICS 5010
J7-J11, J13,
J14
HDR 1x3 TH 100MIL SP 343H
AU 100L SAMTEC TSW-103-07-F-S
J4, J6 HDR 1X6 TH 100MIL SP 338H
AU 100L SAMTEC TSW-106-07-F-S
J5 HDR 2X5 TH 100MIL CTR 338H A
U 100L SAMTEC TSW-105-07-F-D

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
UM11216 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 1.2 — 11 March 2020
19 / 26
Ref Description Size
(inch) Manufacture Part Number Notes
J2 HDR 1X10 TH 100MIL CTR 338H
AU 100L SAMTEC TSW-110-07-F-S
J1, J3 HDR 1X8 TH 100MIL SP 338H
AU 100L SAMTEC TSW-108-07-F-S
J12 CON 5 USB MICRO_
B RA SKT SMT 0.65MM SP 102H AU
WURTH ELEKTR
ONIK EISOS GM
BH & CO. KG
629105136821
C5, C7 CAP CER 4.7uF 16V 10% X7R 0603 MURATA GRM188Z71C475KE21 Not
Installed
C9, C11-C13 CAP CER 0.1uF 16V 10% X7R 0201 MURATA GRM033Z71C104KE14 Not
Installed
JP1-JP11 HDR 1X2 TH 100MIL SP 338H
AU 100L SAMTEC TSW-102-07-F-S Not
Installed
J15-J18 HDR 1x3 TH 100MIL SP 343H
AU 100L SAMTEC TSW-103-07-F-S Not
Installed
R8, R10 RES MF 10.0K 1/10W 1% 0603 YAGEO
AMERICA RC0603FR-0710KL Not
Installed

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
UM11216 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2020. All rights reserved.
User manual Rev. 1.2 — 11 March 2020
20 / 26
13 Placement
Figure 9. PCA9420UK-EVM Evaluation Board Placement