UM90020

NEH2000BY PMIC evaluation boards user guideRev. 1.1 — 11 July 2023

user manual

Document information
Information

ContentKeywords

NEH2000BY, energy harvesting, evaluation board

Abstract

This user manual presents the NEVB-NEH2000BY-3V5 and NEVB-NEH2000BY-4V2 evaluation
boards. It shows in detail the required components and set-up to evaluate the performance ofNEH2000BY PMIC.

UM90020

Nexperia

NEH2000BY PMIC evaluation boards user guide

1. Overview
Nexperia has designed an evaluation board to allow convenient evaluation of the NEH2000BYenergy harvesting PMIC. Fig. 1 shows a 3D and top view of the NEH2000BY evaluation board.
This board is designed to evaluate and test the NEH2000BY PMIC performance and features. Its
small form factor enables easy integration into prototype applications.
The evaluation board is available in 2 variants: NEVB-NEH2000BY-3V5 for use with Lithium Iron
Phosphate (LiFe) rechargeable batteries and NEVB-NEH2000BY-4V2 for use with Lithium Ion andLithium-Ion Polymer (LiPo) rechargeable batteries.
To evaluate the NEH2000BY PMIC performance and features, a PV-cell, rechargeable battery andmultimeter are necessary.

Fig. 1.

NEH2000BY evaluation board 3D, top and bottom views

Fig. 2 shows the schematic of the NEH2000BY evaluation board. Note that the part number for IC2
depends on the evaluation board variants. More description about the available variants can befound in Section 2.

12VIN
VBAT

61300211121

42IC2VDD

14TP2IC1NEH2000BY

VIN

VBAT
VBAT

VBAT
OUT

1DISABLE

GND
C25600 pF

DISABLE
VBAT
VBAT
VBAT
GND

SYSRDY
VREF

VBAT
5121215 SYSRDY3 VREF
C12.2 µF

14671317S-1000C40-I4T1U

2811109RESERVED
GND
GND
GND
GND
GND

J1GND

GND

GND

GND

GND

J261300211121

TP1TP3C32.2 µF
TP4GND

GND

GND

GND

aaa-036398

Fig. 2.

NEH2000BY evaluation board schematic

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NEH2000BY PMIC evaluation boards user guide
Table 1. NEH2000BY evaluation board Orderable Part Numbers
Product typeOrderable Part Number
NEVB-NEH2000BY-3V5

NEVB-NEH2000BY-3UL

NEVB-NEH2000BY-4V2

NEVB-NEH2000BY-4UL

2. Battery Protection
The NEH2000BY evaluation board is designed with overcharging protection for the attachedbattery. The required overcharge protection voltage depends on the type of attached battery. IC2,(see Fig. 2), is responsible for the overcharge protection for the battery. As the maximal battery
voltage is reached IC2 stops charging by pulling the DISABLE pin of NEH2000BY (pin 2) to VBAT.
As the battery voltage is decreased, charging is enabled again by pulling the same pin to GND.
The actual state of the overcharge protection can be observed on TP1 test pad. Its location can beseen in Fig. 3. The appropriate NEH2000BY evaluation board variant should be selected to matchthe required battery.
The following battery types are supported:••

Lithium Iron Phosphate (LiFe) rechargeable battery
NEVB-NEH2000BY-3V5 evaluation board sets the maximal charging voltage to 3.5 Volts forLithium Iron Phosphate rechargeable batteries.
Lithium Ion and Lithium-Ion Polymer (LiPo) rechargeable batteries
1NEVB-NEH2000BY-4V2 evaluation board sets the maximal charging voltage to 4.2 Volts forLithium Ion and Lithium-Ion Polymer rechargeable batteries.

3. Connectors and test pads
The evaluation board provides two pin headers to attach the PV-cell and the battery. The mostimportant signals of the PMIC are also available through the test pads. Table 2 describes thefunctionalities of each header pin or test pad while Fig. 3 shows their polarity and location.

PMIC DC Input

Battery Output++GND

GND

TP1 - SYSRDY
TP2 - DISABLE
TP3 - VREF
TP4 - GND
Fig. 3.

Evaluation board connectors and test pads

1 Because of component shortage, the actual maximum charging voltage of IC2 might be 0.1 V higher.

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NEH2000BY PMIC evaluation boards user guide
Table 2. Evaluation board connectors and test pads
Reference
NameTypeDescriptionJ1PMIC DC input

Pin header

Connect the positive terminal of the harvester to the VIN pin and thenegative terminal to the GND pin.
For the correct polarity see Fig. 3.

J2

Battery output

Pin header

Connect the positive terminal of the storage element to the VBAT pin andthe negative terminal to the GND pin.
For the correct polarity see Fig. 3.

TP1

System ready

Test padThis pad is connected to the SYSRDY pin, pin 15 of the PMIC. Measured
voltage between TP1 and GND shows if the PMIC is ready to convert. If thevoltage on TP1 is equal to VBAT the PMIC is ready to convert, if it is equal
to GND the PMIC is not ready for conversion yet.
Do not force any voltage or connect any load to this pad.

TP2Overcharge
protection

Test padTP2 is to determine if overcharge protection is active or not. Logical low
level on this pad indicates that overcharge protection is inactive and battery
charging is enabled. IC2 is connected to this pad and actively driving thepad and the DISABLE pin, pin 2 of the PMIC.
Do not force any voltage or connect any load to this pad.

TP3Reference
voltage

Test padThis pad is connected to VREF pin, pin 3 of the PMIC. If PMIC is powered
up by the attached battery 1.8 Volts is measured on this pin.
Do not load or connect any circuit to this pin.

TP4

ReferencegroundTest padReference ground pad

4. Connecting a harvester, battery and application
To use the evaluation board, connect the PV-cell to J1 and a rechargeable battery to J2 as shownin Fig. 4. Application can be connected parallel to the battery. Caution should be taken when
making connections. The positive terminal of the PV-cell should be connected to DC_IN pin andthe negative terminal to GND pin. The positive terminal of the battery should be connected toVBAT pin and the negative terminal to GND pin. The type of the connected battery should always
match to the overcharge protection voltage set by the Evaluation Board. The application can beconnected parallel to the rechargeable battery as shown in Fig. 4.
PV- Cell+Battery+Application++-Fig. 4.

UM90020user manual

Connecting a harvester, battery and application

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NEH2000BY PMIC evaluation boards user guide

5. Measuring PMIC efficiency
To determine PMIC efficiency, the input and output power of the PMIC should be measured. Thiscan be done by using two current meters and two voltage meters as shown in Fig. 5. To determine
the input power level, one voltmeter should be connected to the input of the PMIC between DC_INand GND at J1 and a current meter should be connected in series to the harvester.
By multiplying the measured voltage and current the input power can be determined:

Pin = V in × I in

(1)

Pout = V bat × I bat(2)

To determine the output power, one voltmeter should be connected to the output of the PMIC
between VBAT and GND at J2 and a current meter should be connected in series with the battery.
By multiplying the measured voltage and the current the output power can be determined.

I inA-Vin VFig. 5.

+++I bat
AV+VbatConnection to measure PMIC efficiency

The efficiency of the PMIC can be calculated using the formula below:

Efficiency =UM90020

user manual

Pout× 100%P in

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NEH2000BY PMIC evaluation boards user guide6. Bill of Materials
Table 3 and Table 4 show the bill of materials for the NEH2000BY evaluation board variants.
Table 3. Bill of Materials for NEVB-NEH2000BY-3V5 evaluation board
DesignatorQty
Value
Manufacturer Part Number

Manufacturer

C1, C322.2 µF ±10% 10V X7R

GRM155Z71A225KE44D

Murata

C215600 pF ±10% 50V X7R

GRM155R71H562KA88D

MurataIC11Energy harvesting PMIC

NEH2000BY

Nexperia

IC21

Battery protection IC

S-1000C34-I4T1U

ABLIC U.S.A.

J1, J22Header pins

61300211121

Würth Elektronik

Table 4. Bill of Materials for NEVB-NEH2000BY-4V2 evaluation board
Designator
Qty
Value
Manufacturer Part Number

Manufacturer

C1, C322.2 µF ±10% 10V X7R

GRM155Z71A225KE44D

Murata

C215600 pF ±10% 50V X7R

GRM155R71H562KA88D

MurataIC1

1Energy harvesting PMIC

NEH2000BY

Nexperia

IC2

1Battery protection IC

S-1000C40-I4T1U

ABLIC U.S.A.

J1, J22Header pins

61300211121

Würth Elektronik

7. PCB layouts
Fig. 6 show the layout of the evaluation board PCB. Both evaluation board variants share the same
PCB layout.

Top copper layer
Fig. 6.

Bottom copper layer

NEH2000BY evaluation board PCB top and bottom copper layers

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NEH2000BY PMIC evaluation boards user guide

8. Revision history
Table 5. Revision history
Revision
Date
numberDescription

1.1

2023-07-11

PCB orderable part numbers updated; Table 1 added, Fig. 1 updated.

1.0

2023-03-28

Initial version.

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9. Legal information
Definitions
Draft — The document is a draft version only. The content is still underinternal review and subject to formal approval, which may result inmodifications or additions. Nexperia does not give any representations orwarranties as to the accuracy or completeness of information included hereinand shall have no liability for the consequences of use of such information.

Disclaimers
Limited warranty and liability — Information in this document is believed
to be accurate and reliable. However, Nexperia does not give anyrepresentations or warranties, expressed or implied, as to the accuracy
or completeness of such information and shall have no liability for theconsequences of use of such information. Nexperia takes no responsibility
for the content in this document if provided by an information source outsideof Nexperia.
In no event shall Nexperia be liable for any indirect, incidental, punitive,
special or consequential damages (including - without limitation - lostprofits, lost savings, business interruption, costs related to the removalor replacement of any products or rework charges) whether or not suchdamages are based on tort (including negligence), warranty, breach ofcontract or any other legal theory.
Notwithstanding any damages that customer might incur for any reason
whatsoever, Nexperia’s aggregate and cumulative liability towards customer
for the products described herein shall be limited in accordance with theTerms and conditions of commercial sale of Nexperia.
Right to make changes — Nexperia reserves the right to make changes
to information published in this document, including without limitation
specifications and product descriptions, at any time and without notice. Thisdocument supersedes and replaces all information supplied prior to thepublication hereof.
Suitability for use — Nexperia products are not designed, authorized orwarranted to be suitable for use in life support, life-critical or safety-criticalsystems or equipment, nor in applications where failure or malfunctionof an Nexperia product can reasonably be expected to result in personal
injury, death or severe property or environmental damage. Nexperia and its
suppliers accept no liability for inclusion and/or use of Nexperia products insuch equipment or applications and therefore such inclusion and/or use is at
the customer’s own risk.
Applications — Applications that are described herein for any of theseproducts are for illustrative purposes only. Nexperia makes no representation
or warranty that such applications will be suitable for the specified use
without further testing or modification.
Customers are responsible for the design and operation of their applications
and products using Nexperia products, and Nexperia accepts no liability forany assistance with applications or customer product design. It is customer’ssole responsibility to determine whether the Nexperia product is suitableand fit for the customer’s applications and products planned, as well as
for the planned application and use of customer’s third party customer(s).
Customers should provide appropriate design and operating safeguards tominimize the risks associated with their applications and products.
Nexperia does not accept any liability related to any default, damage, costs
or problem which is based on any weakness or default in the customer’sapplications or products, or the application or use by customer’s third party
customer(s). Customer is responsible for doing all necessary testing for thecustomer’s applications and products using Nexperia products in order toavoid a default of the applications and the products or of the application or
use by customer’s third party customer(s). Nexperia does not accept any
liability in this respect.
Export control — This document as well as the item(s) described herein
may be subject to export control regulations. Export might require a priorauthorization from competent authorities.
Translations — A non-English (translated) version of a document is forreference only. The English version shall prevail in case of any discrepancy
between the translated and English versions.

Trademarks
Notice: All referenced brands, product names, service names andtrademarks are the property of their respective owners.

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List of Tables
Table 1. NEH2000BY evaluation board Orderable PartNumbers............................................................................... 3
Table 2. Evaluation board connectors and test pads........... 4
Table 3. Bill of Materials for NEVB-NEH2000BY-3V5
evaluation board...................................................................6
Table 4. Bill of Materials for NEVB-NEH2000BY-4V2
evaluation board...................................................................6
Table 5. Revision history......................................................7UM90020

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List of Figures
Fig. 1. NEH2000BY evaluation board 3D, top andbottom views........................................................................ 2Fig. 2. NEH2000BY evaluation board schematic................. 2Fig. 3. Evaluation board connectors and test pads.............. 3
Fig. 4. Connecting a harvester, battery and application....... 4Fig. 5. Connection to measure PMIC efficiency................... 5Fig. 6. NEH2000BY evaluation board PCB top andbottom copper layers........................................................... 6UM90020

user manual

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NEH2000BY PMIC evaluation boards user guide

Contents
1. Overview........................................................................2
2. Battery Protection........................................................ 3
3. Connectors and test pads........................................... 3
4. Connecting a harvester, battery and application....... 4
5. Measuring PMIC efficiency.......................................... 5
6. Bill of Materials.............................................................6
7. PCB layouts.................................................................. 6
8. Revision history............................................................79. Legal information......................................................... 8© Nexperia B.V. 2023. All rights reserved

For more information, please visit: http://www.nexperia.com
For sales office addresses, please send an email to: salesaddresses@nexperia.com
Date of release: 11 July 2023

UM90020user manual

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