MAX14921 Evaluation Kit
Evaluates: MAX14921
General Description
The MAX14921 evaluation kit (EV kit) demonstrates
a high-accuracy 16-cell battery-management reference
design. The MAX14921 is a high-accuracy 16-cell mea-
surement analog front-end (AFE) in an 80-pin TQFP
surface-mount package. The EV kit features an ADC and
reference, and an isolated interface to a PC through a
USB port to easily measure all cell voltages. Cell stacks
up to 16 cells or 65V can be monitored, whichever is lower.
The EV kit circuit demonstrates all the features of the
device through a GUI application on a Windows
®
-based
PC.
Benefits and Features
● 16-Cell/65V (max) Stack Operating Voltage Range
● Built-In Isolated USB Interface to a Windows-
Based PC
● Plugh-and-Play GUI Demonstrates All the Major
Features of the MAX14921
● μC Firmware in C Available Upon Request
● Screw Terminal Battery Connector
● Proven PCB Layout
● Fully Assembled and Tested
Block Diagram
appears at end of data sheet.
Ordering Information
appears at end of data sheet.
MAX14921 EV Kit Photo
Component List
DESIGNATION
C1–C16
QTY
16
DESCRIPTION
1.2µF ±10%, 16V X7R ceramic
capacitors (0805)
KEMET C0805C125K4RACTU
10µF ±10%, 10V X5R ceramic
capacitor (0805)
KEMET C0805C106K8PAC
0.1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
1µF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
0.1µF ±10%, 100V X7R ceramic
capacitor (0603)
Murata GRM188R72A104KA35D
100pF ±10%, 16V X7R ceramic
capacitors (0603)
AVX 0603YC101KAT2A
0.01µF ±5%, 16V X7R ceramic
capacitors (0603)
AVX 0603YC103JAT2A
C17
C18–C22,
C30, C107,
C126–C129,
C135, C138
C23, C31,
C108–C111,
C115, C130,
C131, C136
C24
1
13
10
1
C25, C29
2
C27, C28
2
Windows is a registered trademark and a registered service
mark of Microsoft Corporation.
19-6668; Rev 0; 4/13
MAX14921 Evaluation Kit
Evaluates: MAX14921
Component List (continued)
DESIGNATION
C101, C103,
C104, C132,
C137
C105, C106
C112–C114,
C116–C119
C133
QTY
5
DESCRIPTION
4.7µF +80%/-20%, 10V Y5V
ceramic capacitors (0603)
Murata GRM188F51A475ZE20D
18pF ±5%, 50V NP0 ceramic
capacitors (0603)
Murata GRM1885C1H180JA01D
Not installed, ceramic capacitors
(0603)
4.7µF ±10%, 16V X7R ceramic
capacitor (0603)
Murata GRM21BR71C475KA73L
0.47µF ±10%, 16V X5R ceramic
capacitor (0603)
TDK C1608X5R1C474K
100V, 200mW Schottky diodes
(SOD123)
Diodes Inc. BAT46W-7-F
68V, 500mW zener diode
(SOD123)
ON Semi MMSZ5266BT1G
Not installed, diode (SOD123)
600Ω, 200mA ferrite chip (0805)
Murata BLM21AG601SN1
Red LEDs
Lite-On LTST-C150CKT
Green LED
Lite-On LTST-C150GKT
24-pin power connector
Weidmuller 1841850000
Not installed, 72-pin dual-row
connector header, 0.1in centers
Sullins PEC36DAAN
USB micro-B connectors
Hirose ZX62-B-5PA(11)
Not installed, USB type-A
connector
Mill-Max 896-43-004-00-000000
Not installed, 9-pin header, 0.1in
centers
Samtec TSW-150-07-T-S
Not installed, test points
DESIGNATION
Q1–Q16
QTY
16
DESCRIPTION
30V n-channel FETs (SOT23)
ON Semi NTR4170NT1G or
NXP 2N7002BK,215
40V npn bipolar transistors
(SOT23)
ON Semi MMBT3904LT3G
100Ω ±5% resistors (0603)
220Ω ±1% resistors (0603)
2
0
1
Q101–Q103
R1, R40–R54
R2, R58
R3, R4, R101,
R108, R131,
R133, R135,
R140
R7–R22
R23–R38
R39
R56, R57
R59, R60,
R126, R129
R61, R106,
R107, R109,
R110,
R116–R128
R102, R103
R111
R112
R113
R114
R115
R130
R132
R134
R136, R137
R138, R139
R141
S101, S102
S103–S106
T101
3
16
2
8
16
16
1
2
4
10kΩ ±1% resistors (0603)
3.3kΩ ±5% resistors (0603)
33Ω ±5%, 1W resistors (2512)
100Ω ±5% resistor (0805)
1kΩ ±1% resistors (0603)
10kΩ ±1% resistors (0603)
C134
1
D1, D101, D102
3
D2
D3
L101
LED101, LED103
LED102
P2
P101
P102, P105
P103
1
0
1
2
1
1
0
2
0
0
2
1
1
1
1
1
1
1
1
2
2
1
2
0
1
Not installed, resistors (0603)
137Ω ±1% resistors (0805)
332Ω ±1% resistor (0603)
39.2kΩ ±1% resistor (0603)
102kΩ ±1% resistor (0603)
3.92kΩ ±1% resistor (0603)
1.5kΩ ±1% resistor (0603)
1kΩ ±5% resistor (0805)
6.04kΩ ±1% resistor (0603)
3.32kΩ ±1% resistor (0603)
301kΩ ±1% resistors (0603)
20kΩ ±1% resistors (0603)
28kΩ ±1% resistor (0603)
Momentary pushbutton switches
OMRON B3FS-1000P
Not installed, momentary
pushbutton switches
1:1:2.6:2.6 1.5kV
RMS
isolation
module
HALO Electronics TGM-H281NF
P104
P106–P113
0
0
www.maximintegrated.com
Maxim Integrated │
2
MAX14921 Evaluation Kit
Evaluates: MAX14921
Component List (continued)
DESIGNATION
U1
U2
U3
U4
U101
QTY
1
1
1
1
1
DESCRIPTION
High-accuracy 16-cell
measurement AFEs (80 TQFP)
Maxim MAX14921ECS+
4.096V voltage reference (8 SO)
Maxim MAX6126AASA41+
16-bit analog-to-digital converter
(10 MSOP)
Maxim MAX11163EUB+
Op amp (5 SC70)
Maxim MAX9620AXK+
ARM-based 32-bit microcontroller
(64 LQFP)
STMicro STM32F101RET6
Not installed, quad 6Mbps level
translator (12 TQFN)
Maxim MAX3395EETC+
Not installed, 1.5A current-limit
switches (8 TDFN-EP*)
Maxim MAX14523AATA+
Not installed, USB peripheral/host
controller with SPI interface
(32 TQFP)
Maxim MAX3421EETJ+
DESIGNATION
U107, U108
QTY
2
DESCRIPTION
6-channel 600V
RMS
digital
isolators (16 SO)
Maxim MAX14850ASE+
12V adjustable LDOs
(6 TDFN-EP*)
Maxim MAX8880ETT+
3W primary-side transformer
H-bridge driver (8 SO)
Maxim MAX256ASA+
USB to serial UART (28 SSOP)
FTDI FT232RL-REEL
1.5A current-limit switches
(8 TDFN-EP*)
Maxim MAX14523AATA+
8MHz, 18pF crystal (HC49/US)
Citizen HCM49-8.000MABJ-UT
Not installed, 12MHz 18pF crystal
(4 SMD)
CTS 406C35D12M00000
PCB: MAX14921 ADVANCED
EVAL PCB
U109, U110
2
U111
U112
U113, U114
Y101
Y102
—
*EP
= Exposed pad.
1
1
2
1
0
1
U102
0
U103, U105
0
U104
0
Component Suppliers
SUPPLIER
AVX North America
Citizen America Corp.
Diodes Incorporated
HALO Electronics, Inc.
Hirose Electric Co., Ltd.
KEMET Corp.
Lite-On, Inc.
Murata Americas
OMRON Corp.
ON Semiconductor
Samtec, Inc.
STMicroelectronics
Sullins Electronics Corp.
TDK Corp.
PHONE
864-967-2150
310-781-1460
805-446-4800
650-903-3800
81-3-3491-9741
864-963-6300
408-946-4873
800-241-6574
—
602-244-6600
800-726-8329
408-452-8585
760-744-0125
847-803-6100
www.avx.com
www.citizencrystal.com
www.diodes.com
www.haloelectronics.com
www.hirose.com
www.kemet.com
www.us.liteon.com
www.murataamericas.com
www.omron.com
www.onsemi.com
www.samtec.com
www.us.st.com
www.sullinselectronics.com
www.component.tdk.com
WEBSITE
Note:
Indicate that you are using the MAX14921 when contacting these component suppliers.
www.maximintegrated.com
Maxim Integrated │
3
MAX14921 Evaluation Kit
Evaluates: MAX14921
Quick Start
Required Equipment
●
MAX14921 EV kit
●
The two files: The “MAX14921 Eval PCB” applica-
tion (MAX14921 EVAL PCB.EXE) and the DLL
“msvcr100.dll”
●
Visit
www.maximintegrated.com/evkitsoftware
to
download the latest version of the EV kit software
●
PC running Windows, with 1 spare USB port
●
USB to micro-USB cable
●
Stack of batteries to test
Procedure
Step 1: Attach Battery
Note: Total battery stack voltage cannot exceed 65V.
You risk failure of the device if you exceed this voltage.
Look at the detachable battery connector, and see how it
mates to the EV kit, see Figure 1. Connect the bottom cell
of the battery stack (the lowest voltage) to the VC0 screw
terminal and to the adjacent GND screw terminal. Be sure
to use two separate wires for these connections. Connect
the top of that cell (also connected to the bottom of the
second cell) to the VC1 screw terminal.
Continue in this fashion until you connect the top of the
16th cell of the battery stack (the highest voltage) to the
VC16 screw terminal and the POWER screw terminal.
Be sure to use two separate wires for these connections.
What if you have less than 16 cells in your battery
stack? The
device can handle 3–16 cells. For example,
you have only 12 cells, in that case, connect the top of
the 12th cell (the highest voltage) to all VC12–VC16 and
POWER screw terminals.
Why do I need to connect the top and the bottom of
the battery stack twice? The
device takes just a small
amount of current from the battery stack to operate. This
tiny power consumption is routed through the POWER
and GND terminals. Providing a separate measurement
trace to the top and the bottom of the battery stack
Figure 1. Detachable Battery Connector
ensures that even this tiny current does not affect cell
measurement accuracy.
Plug the terminal strip portion of the connector into the
mating plug on the EV kit. See Figure 1.
Step 2: Run the Application
Visit
www.maximintegrated.com/evkitsoftware
to
download the latest version of the EV kit software,
MAX14921 EVKIT Software.ZIP. Save the EV kit software
to a temporary folder. Open the .ZIP file and extract the
.EXE file to your preferred location. The .EXE file is the
actual EV kit GUI and not an install program. You can
store the .EXE file wherever you like and then uninstall it
later by simply deleting the .EXE file.
Figure 2. Files Required to Run the Application
www.maximintegrated.com
Maxim Integrated │
4
MAX14921 Evaluation Kit
Evaluates: MAX14921
Ensure that both files the application (“MAX14921 Eval
PCB” and the DLL “msvcr100.dll”) are in the same
folder. Navigate to the folder with the files and select the
“MAX14921 Eval PCB” application. Double-click on it to
run the application. See Figure 2.
If I have the files on a separate drive, do I need to
move these files to my PC?
If you have the files on a
USB memory device, there is no need to move them. As
long as the two files remain in the same folder, the applica-
tion runs anywhere, including from a USB memory device.
Does the application install a driver on my PC?
No,
it does not. The application needs no drivers other than
those built into Windows.
Once the application is running, you should see a window
similar to the one in Figure 3. Most of the data items are
blank and are automatically filled in when the application
detects an EV kit attached to any USB port on the computer.
LED103, to the left of the isolation transformer glows red
when the EV kit is properly powered (see Figure 4). Also,
LED102, towards the middle of the PCB, blinks green
when the microprocessor is running the firmware.
Once you have correctly attached the EV kit to the PC, the
application automatically starts reporting cell voltage data.
Detailed Description of Hardware
Step 3: Attach the EV Kit to the PC
Use the USB cable to attach the EV kit to the PC. The
correct USB connector on the EV kit is labeled P102, and
is near the top left of the PCB, under S101, RESET.
The
MAX14921
EV kit
is a fully assembled and tested cir-
cuit board demonstrating the capabilities of the MAX14921
high-accuracy 16-cell battery management AFE IC in an
80-pin surface-mount TQFP package. This EV kit works
with a PC-based GUI demonstrating all the major features
of the device. The EV kit also features a MAX6126 preci-
sion voltage reference and a MAX11163 16-bit, 500ksps
serial ADC. The MAX14921 and the analog portion of the
ADC are powered by the battery cell stack. All other EV kit
circuits are powered from the USB interface.
Ensure that the total cell stack voltage does not
exceed 65V. Reduce the number of cells in the stack,
if needed, to keep to 65V or lower.
ATTACH
TO PC HERE
Figure 3. MAX14921 EV Kit GUI
Figure 4. MAX14921 EV Kit Attachment
www.maximintegrated.com
Maxim Integrated │
5
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