NXP Semiconductors PCA9420UK-EVM User manual

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

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

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
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User manual Rev. 1.2 — 11 March 2020
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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

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
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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

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
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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.

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
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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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PCA9420UK-EVM evaluation board user manual
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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

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
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User manual Rev. 1.2 — 11 March 2020
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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

NXP Semiconductors UM11216
PCA9420UK-EVM evaluation board user manual
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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