1

DEMO MANUAL DC2973A

Rev. 0

DESCRIPTION

LTC3337Primary Battery SOH Monitor with

Precision Coulomb Counter

Demonstration circuit 2973A shows the LTC®3337 Primary Battery State of Health (SOH) monitor with pre-cision coulomb counter operating with a configurable peak current limit. The LTC3337 supports input voltages from 1.8V to 5.5V and a peak current up to 100mA with a quiescent current of 100nA. Coulomb count, battery volt-age, and Battery Series Resistance (BSR) are measurable and can be used to quantify the charge state and health of a battery.

All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

BOARD PHOTO

The DC2973A demonstrates a simple layout for the high-est-power configuration of the LTC3337. The circuit can be reduced for lower IPEAK levels. The demo board can be connected directly to a PC using a micro USB cable in order to run a GUI and configure simple a Battery State of Charge (SOC) monitor. Source code for the GUI is avail-able and can be used as a starting point for LTC3337 firmware development.

Design files for this circuit board are available.

Specifications are at TA = 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 1.8 5.5 V

IOUT Output Current IPK2 – IPK0 = 111 100 mA

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DEMO MANUAL DC2973A

Rev. 0

QUICK START PROCEDURERefer to Figure 1 for the proper measurement equipment setup and jumper settings. Please follow the procedure below to familiarize yourself with the DC2973A.

1. Configure the IPEAK jumpers for your chosen current limit. Choose R1 based on the formula below:

R1 = 10/IPEAK (Ω)

R1 Power Rating ≥ 2.5 • IPEAK (W)

Or use an electronic load in CC mode pulling IPEAK/2.

2. Connect DC2973A to a computer using a USB cable and launch QuikEval™ to download and run the GUI (see GUI Application section for download instructions).

3. Enable PS1.

4. In the GUI, click the Battery Setup button and configure for your chosen battery (or use the settings shown below for a demo). Once finished, click the start button.

5. The coulomb counter is now monitoring the SOC of the battery. For higher resolution visibility, switch to the Engineering tab to view the raw Accumulated Charge count.

6. Once familiar with the operation, replace PS1 and R1 with your battery and system load, respectively.

Figure 1. Quick Start Setup for the DC2973A Demo Circuit

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DEMO MANUAL DC2973A

Rev. 0

CONFIGURING IPEAK

SOFTWARE TOOLS

The peak current limit of the LTC3337 (IPEAK) is con-figured by moving the JP1-JP3 shunts on the DC2973A demo board. Note that the IPEAK setting is locked at startup.

Refer to Table 1 to configure the IPEAK setting. This table is also located on the back of the DC2973A PCB.

On-Board Digital Interface

The LTC3337 demo board includes an Atmel SMART SAM D21 processor with an Arduino bootloader that makes it compatible with the Arduino IDE. This means users can prototype processor functionality directly in the free Ardu-ino IDE. The SDK mentioned below includes an Arduino example project that can be opened and uploaded to the board through the Arduino IDE.

Software Development Kit

To help with learning and development of LTC3337 appli-cations, there exists a Software Development Kit (SDK) that makes interfacing with the LTC3337 as simple as possible. The package includes a few example programs and comes fully equipped with register names and value formatting. Resources are given for both C code (with Arduino examples) and Python code. This SDK can be downloaded from the LTC3337 product webpage. Fur-ther instructions to use the SDK are included within the download.

Restoring GUI-Compatible Firmware

If the onboard firmware is changed (to upload SDK firm-ware, for example), it can be restored at any time through the GUI. In this case, the GUI will need to be launched manually because QuikEval will not recognize the board once it has been reprogrammed. By default, the GUI installs to:

C:\Program Files (x86)\LTC\LTC3337 GUI\em3337.exe

Debugging Custom Designs

The DC2973A’s default firmware and engineering GUI tab are designed to give a high-speed debugging environment for LTC3337 operation. This functionality can be easily extended to interface with your own custom LTC3337 cir-cuit design. To use the engineering GUI tab with a custom circuit board, simply leave the LTC3337 on the DC2973A unpowered and connect your own board to the SMBus interface accessible through header J3.

Table 1. IPEAK Configuration

JUMPER CONFIGURATIONIPEAKIPK2 IPK1 IPK0

0 0 0 5mA0 0 1 10mA0 1 0 15mA0 1 1 20mA1 0 0 25mA1 0 1 50mA1 1 0 75mA1 1 1 100mA

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DEMO MANUAL DC2973A

Rev. 0

GUI APPLICATIONIntroduction to the GUI

The LTC3337 GUI provides a graphical interface for some of the main features of the LTC3337. In addition, it pro-vides an advanced debugging interface that can be used in evaluating operation of the DC2973A as well as a cus-tomer’s own design.

To use the DC2973A, the PC must first have the proper software driver and GUI installed. Download the QuikEval software from www.analog.com and install the QuikEval software by running the executable ltcqev.exe. Follow the instructions to connect the DC2973A.

For more detail on GUI functions, launch the GUI and go to Window ➝ Show Help Guide.

GUI Layout

The LTC3337 GUI is divided into a Dashboard tab, an Engineering tab, and a Schematic tab. The Dashboard tab shows a graphical representation of a some of the

LTC3337’s core functionality. The Engineering tab shows all registers and is intended to be used for lower-level development and debugging purposes. The Schematic tab just displays the schematic for reference.

Dashboard Tab

The Dashboard tab shows all the basic information needed to monitor a battery’s state of charge. Along with the accumulated charge information, the battery voltage, series resistance, and average current are also shown. While the dashboard is open, the GUI reads data from the LTC3337 every 200ms.

To set up a battery for SoC measurement, click the Battery Setup button in the bottom-left corner. From there, con-figure your battery settings as required and click the Start button. This sets a target accumulated charge value at which the remaining capacity of the battery is considered to be 0%. After starting the test, intermediate calculations can be viewed by showing the Console window.

Figure 2. The Dashboard Tab

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DEMO MANUAL DC2973A

Rev. 0

GUI APPLICATIONEngineering Tab

The Engineering tab is an advanced debugging tool which allows high-speed reading of any register. Register group-ings can be displayed by activating the checkboxes in the Categories section.

To read a register, simply double-click the register name or value. To read all shown registers, double-click anywhere in the empty background space. To continuously read all shown registers, right-click and select Continuous Read from the context menu. When continuously reading, the GUI will poll all of the displayed registers as fast as pos-sible. By default, a register entry will flash green when the new data is different from the previous data; this can be changed in the right-click context menu.

To write a register, right-click on a writable register and select Write… from the context menu. This will bring up a dialog with a few options for writing values.

For detailed information about a register, hovering over it for about a second will display the same tool tips as are visible in the other tabs of the GUI.

By default, register entries are displayed as formatted decimal values or Booleans. This can be changed to raw binary or hexadecimal notation by right-clicking on an entry and choosing Select Format.

Tabs can be added to the Engineering view by clicking the + button in the top-right corner. This allows the user to change between viewing different register groupings at ease.

Consult the Help Guide for more detail on the Engineering tab.

Figure 3. The Engineering Tab

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DEMO MANUAL DC2973A

Rev. 0

GUI APPLICATIONSchematic Tab

The Schematic Tab simply shows the DC2973A schematic for quick reference while using the GUI.

Figure 4. The Schematic Tab

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DEMO MANUAL DC2973A

Rev. 0

GUI APPLICATIONLogger Window

The Logger can be launched by going to Window ➝ Show Logger. This feature allows configurable logging of bitfields and can be used for rapid or long-term data

collection. Data can be exported into a CSV format (for import to Excel) or to a SQL database. Note that other GUI tabs will be inactive while logging, so writing bitfields is disabled.

Figure 5. The Logger Window

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DEMO MANUAL DC2973A

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 10µF, X5R, 10V, 10%, 0603 AVX, 0603ZD106KAT2A MURATA, GRM188R61A106KAALD SAMSUNG, CL10A106KP8NNNC

2 1 C2 CAP., 150µF, X5R, 6.3V, 20%, 1210 SAMSUNG, CL32A157MQVNNNE

3 0 C3 CAP., 180µF, ALUM POLY, OS-CON, 25V, 20%, 8mm × 11.9mm, SMD, RADIAL, E12

PANASONIC, 25SVPF180M

4 1 C4 CAP., 10µF, X5R, 6.3V, 20%, 0603 MURATA, GRM188R60J106ME47D MURATA, GRM188R60J106ME47J TAIYO YUDEN, JMK107ABJ106MA-T AVX, 06036D106MAT2A NIC, NMC0603X5R106M6.3TRPF TDK, C1608X5R0J106M080AB

5 4 C5, C6, C7, C8 CAP., 0.1µF, X5R, 10V, 20%, 0402 WURTH ELEKTRONIK, 885012105010

6 2 C9, C10 CAP., 22pF, NP0, 50V, 5%, 0402 WURTH ELEKTRONIK, 885012005057

7 2 C11, C12 CAP., 1µF, BJ, 10V, 20%, 0402 TDK, CGB2A1JB1A105M033BC

8 1 C13 CAP., 0.01µF, X7R, 25V, 10%, 0402 WURTH ELEKTRONIK, 885012205050

9 1 C14 CAP., 2.2µF, X5R, 10V, 20%, 0402 WURTH ELEKTRONIK, 885012105013

10 0 C15, C16 CAP., 10F, ULTRA, 2.7V, –10/+20%, RADIAL, THT NESSCAP CO. LTD., BCAP0010 P270 S01 NESSCAP CO. LTD., ESHSR-0010C0-002R7

11 0 C17 CAP., 0.12F, SUPERCAP, HIGH TEMP, 5.5V, 20%, 20mm × 18mm × 2.5mm, SMD, DUAL CELL

CAP-XX, HA202F

12 2 D1, D4 LED, YELLOW, WATERCLEAR, 0603 WURTH ELEKTRONIK, 150060YS75000

13 2 D2, D3 LED, BRIGHT GREEN, WATERCLEAR, 0603 WURTH ELEKTRONIK, 150060VS75000

14 4 E1, E2, E3, E4 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0

15 3 E5, E6, E7 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2308-2-00-80-00-00-07-0

16 1 J1 CONN., uUSB 2.0, RCPT., 5-PIN, 1PORT, REVERSE MOUNT, R/A HORZ., TYPE B, FLANGELESS

TE CONNECTIVITY, 1932788-1

17 1 J2 CONN., HDR, MALE, 2x5, 1.27mm, VERT, ST, THT WURTH ELEKTRONIK, 62201021121

18 1 J3 CONN., HDR, MALE, 1x5, 2.54mm, VERT, ST, THT SAMTEC, TSW-105-07-L-S

19 4 JP1, JP2, JP3, JP4 CONN., HDR, MALE, 1x3, 2mm, VERT, ST, THT, 10u" Au SAMTEC, TMM-103-02-L-S

20 1 L1 IND., 30Ω AT 100MHz, BEAD, 10%, 6A, 10mΩ, 0805, 1LN TDK, MPZ2012S300AT000

21 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10

22 3 M1, M2, M3 XSTR., MOSFET, N-CH, 20V, 1.4A, SOT-323, AEC-Q200 INFINEON, BSS816NWH6327XTSA1

23 3 M4, M5, M6 XSTR., MOSFET, DUAL, N-CH, 280mA, SOT-563 DIODES INC., 2N7002VAC-7

24 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE, 8833

25 1 PCB1 PCB, DC2973A ADI APPROVED SUPPLIER, 600-DC2973A

26 3 R1, R2, R6 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J103TRF ROHM, MCR01MZPJ103 VISHAY, CRCW040210K0JNED

27 0 R3 RES., OPTION, 0603

28 2 R4, R5 RES., 0Ω, 1%, 0603, AEC-Q200 KOA SPEER, RK73Z1JTTDD VISHAY, CRCW06030000Z0EA

29 3 R7, R16, R17 RES., 4.7k, 5%, 1/16W, 0402, AEC-Q200 NIC, NRC04J472TRF VISHAY, CRCW04024K70JNED

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DEMO MANUAL DC2973A

Rev. 0

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

30 3 R8, R13, R14 RES., 2.2k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04022K20JNED NIC, NRC04J222TRF

31 3 R9, R10, R11 RES., 301Ω, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF3010V VISHAY, CRCW0603301RFKEA NIC, NRC06F3010TRF

32 1 R12 RES., 10k, 5%, 1/16W, 0402 SAMSUNG, RC1005J103CS YAGEO, RC0402JR-0710KL

33 1 R15 RES., 1M, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00JNED NIC, NRC04J105TRF

34 1 R18 RES., 100k, 5%, 1/16W, 0402, AEC-Q200 ROHM, MCR01MZPJ104 VISHAY, CRCW0402100KJNED

35 1 R19 RES., 196k, 1%, 1/10W, 0603 VISHAY, CRCW0603196KFKEA YAGEO, RC0603FR-07196KL

36 1 R20 RES., 115k, 1%, 1/10W, 0603 NIC, NRC06F1153TRF VISHAY, CRCW0603115KFKEA YAGEO, RC0603FR-07115KL

37 1 R21 RES., 1Ω, 5%, 1/16W, 0402, AEC-Q200 KOA SPEER, RK73B1ETTP1R0J STACKPOLE ELECTRONICS, INC., RMCF0402JT1R00 VISHAY, CRCW04021R00JNED

38 0 TP1, TP2 TESTPOINT, PCB COPPER FEATURE

39 1 U1 PRIMARY BATTERY SOH MONITOR W/PRECISION COULOMB COUNTER, GQFN-12

ANALOG DEVICES, LTC3337ERC#PBF

40 1 U2 IC, USB 2.0 µModule® TRANSCEIVER, BGA-44 ANALOG DEVICES, LTM2884CY#PBF

41 1 U3 IC, MEMORY, MCU, 32-BIT, 256KB FLASH, TQFP48 MICROCHIP, ATSAMD21G18A-AUT

42 1 U4 IC, REG LDO ADJ, 100mA, TSOT23-5 ANALOG DEVICES, LT1761ES5-BYP#PBF ANALOG DEVICES, LT1761ES5-BYP#TRMPBF ANALOG DEVICES, LT1761ES5-BYP#TRPBF

43 4 XJP1, XJP2, XJP3, XJP4

CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

44 1 Y1 CRYSTAL, 32.768kHz, 12.5pF, 3.2mm × 1.5mm SMD ABRACON, ABS07-32.768kHz-4-T ECS INC., ECS-.327-12.5-34B-TR KYOCERA, ST3215SB32768H5HPWAA NDK, (See DFF)

10

DEMO MANUAL DC2973A

Rev. 0

SCHEMATIC DIAGRAM5 5

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5

IRQ

6

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7

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IPK1 9

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12

GND 13

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1

2

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11

DEMO MANUAL DC2973A

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SCHEMATIC DIAGRAM5 5

4 4

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GND

B1GN

DB2

GND

B3GN

DB4

GND

B5GN

DB6

GND

B7GN

DB8

GND

B9GN

DB1

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DB1

1

GND2

K1GN

D2K2

GND2

K3GN

D2K4

GND2

K5GN

D2K6

GND2

K7GN

D2K8

GND2

K9GN

D2K1

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1

GND2

L3GN

D2L4

GND2

L6GN

D2L7

GND

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CA8

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CA1

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P

IN1

GND

2

BYP

3

ADJ

4

OUT

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C5 0.1u

F

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C6 0.1u

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R14

2.2k 5%

RESE

TN

RESE

TN

12

DEMO MANUAL DC2973A

Rev. 0

ANALOG DEVICES, INC. 2021

06/21www.analog.com

ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

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