Analog Devices DC2973A Quick setup guide

1
DEMO MANUAL DC2973A
Rev. 0
DESCRIPTION
LTC3337
Primary Battery SOH Monitor with
Precision Coulomb Counter
Demonstration circuit 2973A shows the LT C
®
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

2
DEMO MANUAL DC2973A
Rev. 0
QUICK START PROCEDURE
Refer 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

3
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)\LT C \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 CONFIGURATION
IPEAKIPK2 IPK1 IPK0
0 0 0 5mA
0 0 1 10mA
0 1 0 15mA
0 1 1 20mA
1 0 0 25mA
1 0 1 50mA
1 1 0 75mA
1 1 1 100mA

4
DEMO MANUAL DC2973A
Rev. 0
GUI APPLICATION
Introduction 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

5
DEMO MANUAL DC2973A
Rev. 0
GUI APPLICATION
Engineering 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

6
DEMO MANUAL DC2973A
Rev. 0
GUI APPLICATION
Schematic Tab
The Schematic Tab simply shows the DC2973A schematic
for quick reference while using the GUI.
Figure4. The Schematic Tab

7
DEMO MANUAL DC2973A
Rev. 0
GUI APPLICATION
Logger 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

8
DEMO MANUAL DC2973A
Rev. 0
PARTS LIST
ITEM 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

9
DEMO MANUAL DC2973A
Rev. 0
PARTS LIST
ITEM 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 DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
REVISION HISTORY
ECO REV DESCRIPTION APPROVED DATE
-02 PRODUCTION ZP 4-23-2020
1.8V - 5.5V
BAT_IN
GND
BATOUT_OK GND
UNLESS OTHERWISE SPECIFIED 1. RESISTORS: OHMS, 0402, 1%, 1/16W 2. CAPACITORS: 0402, 10%, 25V
PRIMARY BATTERY SOH MONITOR WITH PRECISION COULOMB COUNTER
PCA ADDITIONAL PARTS
1.8V - 5.5V
100mA
GND
BAT_OUT
IPK2
1 0
1
IPK1
00
1
IPK0
LED_PWR
EXT USB
ONLY ONE OF R3 OR R4 SHOULD BE POPULATED AT ONCE
IRQ BATOUT_OK
120mF
OPT
FOR HIGH-ESR BATTERIES
REMOVE R5 BEFORE CONNECTING TO BAL PIN. INSTALL R5 IF BAL PIN NOT USED.
OPT
IPEAK
0
15mA
1 1 0
IPK1
20mA
5mA
1 0
IPK0
10mA
1
0
IPK2
0 0 0 0
0
1 11 111
011 0 0 25mA
75mA 50mA
100mA
OPT
OPT
EXT_LED_PWR
1.8V - 5.5V
*
*
BAT_IN BAT_IN BAT_IN
SCL SDA IRQ
DVcc
IRQ
USB_PWR USB_PWR
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
12
NC ZP
LTC3337
DC2973A
710-DC2973A_REV02
705-DC2973A_REV02
8.5x11
04-23-2020DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
12
NC ZP
LTC3337
DC2973A
710-DC2973A_REV02
705-DC2973A_REV02
8.5x11
04-23-2020DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
12
NC ZP
LTC3337
DC2973A
710-DC2973A_REV02
705-DC2973A_REV02
8.5x11
04-23-2020
MH4 STANDOFF,NYLON,SNAP-ON,0.50"
PCB1 PCB, DC2973A REV02
M3
1
32
E7
E2
C1
10uF
E5
R7 4.7k 5%
D1 YELLOW
R3 OPT
0603
D2 BRIGHT GREEN
E3
MH1 STANDOFF,NYLON,SNAP-ON,0.50"
R5
0
0603
MH3 STANDOFF,NYLON,SNAP-ON,0.50"
R4 0
0603
JP2
1
2
3
R1
10k 5%
+
C3 C2
150uF 1210 6.3V 20%
E6
M2
1
32
LB1 LABEL
JP1
1
2
3
E1
R2
10k 5%
STNCL1 TOOL, STENCIL, 700-DC2973A REV02
JP4
1
2
3
R6
10k 5%
M1
BSS816NWH6327XTSA1
1
32
R8
2.2k
5%
+
C16 10F
C17 HA202F
+
1
-
2
BAL
3
E4
MH2 STANDOFF,NYLON,SNAP-ON,0.50"
+
C15
10F
U1
LTC3337ERC
BAL 1
AVcc 2
DVcc
3
SCL
4
SDA
5
IRQ
6
BATOUT_OK 7
IPK2
8
IPK1
9
IPK0
10
BAT_IN
11 BAT_OUT 12
GND
13
JP3
1
2
3
AVcc
BAT_IN
BATOUT_OK
AVcc
BATOUT_OK

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 DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
UNLESS OTHERWISE SPECIFIED 1. RESISTORS: OHMS, 0402, 1%, 1/16W 2. CAPACITORS: 0402, 10%, 10V
Close to J1.1
DVCC SDA SCL GND IRQ
COMMSTATUS
3.3V
5V
5V
PRIMARY BATTERY SOH MONITOR WITH PRECISION COULOMB COUNTER
Vcc
VCCin
Vcc_MCU
Vcc_MCU
Vcc_MCU Vcc_MCU
Vcc_MCU
Vcc_MCU
Vcc_MCU
Vcc
Vcc_MCU
IRQ
IRQ
USB_PWR SDA
SCL
DVcc
SDA
SCL
DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
22
NC ZP
LTC3337
DC2973A
710-DC2973A_REV02
705-DC2973A_REV02
8.5x11
04-23-2020DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
22
NC ZP
LTC3337
DC2973A
710-DC2973A_REV02
705-DC2973A_REV02
8.5x11
04-23-2020DATE:
IC NO.
SHEET OF
TITLE: DEMO CIRCUIT SCHEMATIC,
APPROVALS
PCB DES. APP ENG.
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
SIZE:
SKU NO.
SCHEMATIC NO. AND REVISION:
PCA ASS'Y DWG:
www.analog.com
22
NC ZP
LTC3337
DC2973A
710-DC2973A_REV02
705-DC2973A_REV02
8.5x11
04-23-2020
C9 22pF 50V 5%
C7 0.1uF
C14
2.2uF
R13
2.2k
5%
M5A 2N7002VAC-7
J3
1 2 3 4 5
C8 0.1uF
M4A
2N7002VAC-7
Y1
32.768kHz
1 2
R20
115k
0603
R21
1
5%
TP1
U3
ATSAMD21G18A-AUT
PA0/XIN32/EIC/SCOM1PAD0/TC2
1
PA1/XOUT32/EIC/SCOM1PAD1/TC2
2
PA2/EIC/AIN0 3
PA3/EIC/REF/AIN1 4
GNDANA
5
VDDANA
6
PB8/EIC/AIN2/SCOM4PAD0/TC4 7
PB9/EIC/AIN3/SCOM4PAD1//TC4 8
PA4/EIC/REF/AIN4/SCOM0PAD0/TC0 9
PA5/EIC/AIN5/SCOM0PAD1/TC0 10 PA6/EIC/AIN6/SCOM0PAD2/TC1 11 PA7/EIC/AIN7/SCOM0PAD3/TC1 12
PA8/I2C/AIN16/SCOM2PAD0+/TC0 13
PA9/I2C/EIC/AIN17/SCOM2PAD1+/TC0 14
PA10/EIC/AIN18/SCOM2PAD2+/TC1 15 PA11/EIC/AIN19/SCOM2PAD3+/TC1 16
VDDIO1
17
GND1
18
PB10/EIC/SCOM4PAD2/TC5 19 PB11/EIC/SCOM4PAD3/TC5 20
PA12/I2C/EIC/SCOM2PAD0+/TC2 21 PA13/I2C/EIC/SCOM2PAD1+/TC2 22
PA14/XIN/EIC/SCOM2PAD2+/TC3 23
PA15/XOUT/EIC/SCOM2PAD3+/TC3 24
PA16/I2C/EIC/SCOM1PAD0+/TC2 25 PA17/I2C/EIC/SCOM1PAD1+/TC2 26
PA18/EIC/SCOM1PAD2+/TC3 27 PA19/EIC/SCOM1PAD3+/TC3 28
PA20/EIC/SCOM5PAD2+ 29 PA21/EIC/SCOM5PAD3+ 30
PA22/I2C/EIC/SCOM5PAD0+/TC4 31 PA23/I2C/EIC/SCOM5PAD1+/TC4 32
PA24/EIC/SCOM3PAD2+/TC5
33 PA25/EIC/SCOM3PAD3+/TC5 34
GND2
35
VDDIO2
36
PB22/EIC/SCOM5PAD2 37 PB23/EIC/SCOM5PAD3 38
PA27/EIC
39
40
RESETN PA28/EIC 41
GND3
42
VDDCORE1
43
VDDIN
44
PA30/EIC/SCOM1PAD2/TC1 45 PA31/EIC/SCOM1PAD3/TC1 46
PB2/EIC/AIN10/SCOM5PAD0 47
PB3/EIC/AIN11/SCOM5PAD1
48
J1
uUSB 2.0
1932788-1
VBUS 1
D- 2
D+ 3
ID 4
GND 5
GND
6GND
7
R19
196k 0603
R16 4.7k 5%
R9 301 0603
M5B
2N7002VAC-7
D4 YELLOW
C4 10uF
6.3V
0603
J2
1 2 3 5 6
4
7 8
109
C11 1uF
D3
BRIGHT GREEN
R10 301 0603
TP2
C10 22pF 50V 5%
M6B
L1
30 OHMS@100MHz
1 2
R11 301 0603
R15 1M
5%
C13 0.01uF
R18 100k 5%
M6A
2N7002VAC-7
M4B
2N7002VAC-7
U2 LTM2884-BGA
D1+
A2
D1-
A1
SPND-PWR
A3
ON
A4
VLO
A5
GND
B1
GND
B2
GND
B3
GND
B4
GND
B5
GND
B6
GND
B7
GND
B8
GND
B9
GND
B10
GND
B11
GND2 K1 GND2 K2 GND2 K3 GND2 K4 GND2 K5 GND2 K6 GND2 K7 GND2 K8 GND2 K9 GND2 K10 GND2 K11 GND2 L3 GND2 L4 GND2 L6 GND2 L7
GND
A6
VBUS
A7
VCC
A8 VCC A9 VCC
A10 VCC A11
D2- L1
D2+ L2
VLO2 L5
VCC2 L8 VCC2 L9 VCC2 L10 VCC2 L11
R17 4.7k 5%
U4
LT1761-S5-BYP
IN
1
GND
2
BYP 3
ADJ 4
OUT 5
C5 0.1uF
R12 10k
5%
C12 1uF
C6 0.1uF
R14
2.2k
5%
RESETN
RESETN

12
DEMO MANUAL DC2973A
Rev. 0
 ANALOG DEVICES, INC. 2021
06/21
www.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.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and
conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation
Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)
and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to
Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and
agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted
is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third
Party to access the Evaluation Board. As used herein, the term “Third Party”includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is
NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all
be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of
use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile
or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited
to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS
Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS”AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY
DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS
LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING
BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

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