LINER LTC6812-1 Daisy chain isospi battery-stack monitor Datasheet

DEMO MANUAL DC2350A
LTC6812-1/LTC6813-1
Daisy Chain isoSPI
Battery-Stack Monitor
DESCRIPTION
Demonstration circuit 2350A is a multicell battery stack
monitor featuring the LTC®6812-1, a 15-cell monitor on
the DC2350A-A, or the LTC6813-1, an 18-cell monitor on
the DC2350A-B. Multiple boards can be linked through a
2-wire isolated serial interface (isoSPI) to monitor any
number of cells in a stack. The demo circuit also features
reversible isoSPI enabling a fully redundant communication path.
The DC2350 can communicate to a PC by connecting
directly to a DC2026 Linduino® One. The DC2026 must be
loaded with the appropriate program (called a “sketch”)
to control the battery stack monitor IC and receive data
through a USB serial port. The DC2792/DC1941 can be
connected to the DC2026 to provide a fully isolated isoSPI
interface to the DC2350.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2350A
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
DC2350A
DC2350A-A
PARAMETER
DC2350A-B
MIN
TYP
MAX
MIN
TYP
MAX
V+ Supply Voltage
16
50
75
16
60
90
V+ to C15 Voltage
–0.3
UNITS
V
V
V+ to C10 Voltage
40
V
C11 Voltage
2.5
V
C6 Voltage
1
V
V+ to C18 Voltage
–0.3
V
V+ to C12 Voltage
40
V
C13 Voltage
2.5
V
C7 Voltage
1
V
VREG Supply Voltage
VREF1 1st Reference Voltage, No Load
4.5
5
5.5
4.5
5
5.5
V
3.0
3.15
3.3
3.0
3.15
3.3
V
VREF2 2nd Reference Voltage, 5k Load to V–
2.993
3
3.007
2.993
3
3.007
V
VBIAS IBIAS Voltage, READY/ACTIVE State
1.9
2.0
2.1
1.9
2.0
2.1
V
5
0
5
V
CPIN Input Range
Cell Count
0
15
18
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1
DEMO MANUAL DC2350A
HARDWARE SETUP
Wiring J4 Connector
The DC2350A-A and DC2350A-B demo circuits (boards)
have different connector pinouts. It is critical that the correct wiring is followed or there is a risk of damaging the
demo board.
When connected to a battery stack, power for the DC2350
is provided by the cell group being monitored. To connect
the cell group, separate the screw-terminal block section
from the J4 connector. Then, insert the cell-voltage connections or resistors into the screw-terminal clamping
contacts. These connections provide the power and input
stimulus for the battery stack monitor IC.
Cell-voltages are wired to J4 starting from position 1
(most negative potential of the group). Please reference the appropriate demo board J4 connector pinout in
Tables 1 and 2.
Alternatively, resistors can be used to simulate battery
cell-voltages. 100Ω 0.5W or equivalent resistors are recommended because 100Ω (or lower values) typically will
not induce measurement errors and the 0.5W (or greater
rating) will keep the resistor temperatures low preventing
power dissipation damage.
DC2350A-A 15 Resistor Connection
Carefully connect fifteen 100Ω resistors onto the screwterminal block between each CPIN input clamping contact
and skip the NC (no connect) contacts from position 1 to
position 18 as shown in Table 1, DC2350A-A J4 Pinout.
Provide a stack-equivalent power supply connection
to position 18 (positive) and position 1 (negative). The
power supply may be adjusted to provide the desired
nominal cell-voltage (e.g. 49.5V will be 3.3V per cell).
DC2350A-B 18 Resistor Connection
Carefully connect eighteen 100Ω resistors between each
screw-terminal block clamping contact from position 1 to
position 19 as shown in Table 2, DC2350A-B J4 Pinout.
Provide a stack-equivalent power supply connection
to position 19 (positive) and position 1 (negative). The
power supply may be adjusted to provide the desired
nominal cell-voltage (e.g. 59.4V will be 3.3V per cell).
Table 1. DC2350A-A J4 Pinout
J4 Pin
CPIN Input
1
C0/V–
2
C1
3
C2
4
C3
5
C4
6
C5
7
NC
8
C6
9
C7
10
C8
11
C9
12
C10
13
NC
14
C11
15
C12
16
C13
17
C14
18
C15
19
NC
Table 2. DC2350A-B J4 Pinout
J4 Pin
CPIN Input
1
C0/V–
2
C1
3
C2
4
C3
5
C4
6
C5
7
C6
8
C7
9
C8
10
C9
11
C10
12
C11
13
C12
14
C13
15
C14
16
C15
17
C16
18
C17
19
C18
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DEMO MANUAL DC2350A
JUMPERS
The demo board jumpers must be set to match the desired
mode of operation. The jumpers enable the Discharge
Timer and select the serial communication mode to the
battery stack monitor IC.
ISOMD Jumpers JP1–JP3
0: Set jumpers to 0 for standard SPI communication to
the IC through the J3 connector.
1: Set jumpers to 1 for isoSPI communication to the IC
through either the J1 or J2 connector.
SWTEN Jumper JP4
0: Set jumpers to 0 for Discharge Timer disable.
1: Set jumpers to 1 for Discharge Timer enable.
DC2350 SERIAL INTERFACE OPTIONS
The DC2350 has several communication options. The
DC2026 Linduino One provides a USB-to-SPI interface,
and is ideal to interface from a PC to any SPI device. In
this case, the DC2026 SPI interface can connect directly
to the DC2350 (see section entitled DC2026 to DC2350
SPI Connection for details). Alternately, the DC2026 SPI
can be translated to isoSPI via the DC2792 or DC1941
demo boards. The DC2792 is a dual master isoSPI demo
board which can be connected as a typical single-ended
isoSPI bus master or to both ends of a reversible configuration with two isoSPI bus masters. The DC1941 can
be connected as a typical single-ended isoSPI bus master.
USING OTHER SPI MASTER BOARDS
When a different SPI master microcontroller board is used
instead of the DC2026, more components or equipment
are required to properly interface to the demo boards.
Here are the requirements:
resistor can be installed. On the DC2350, a 0603 size 5kΩ
resistor can be soldered onto R8 or on the microcontroller
board, a 5kΩ resistor can be added between the microcontroller SPI MISO line and the microcontroller VCC pin.
SPI MISO Line
isoSPI IC Power
Most SPI master microcontroller boards will not have a
SPI MISO line pull-up. A 5kΩ pull-up resistor is required
on the SPI MISO line because the battery stack monitor
IC SDO is an open drain NMOS output pin. Otherwise,
the SPI MISO line will be floating where the SPI readback
of each byte will typically appear as no response or all
ones or 0xFFs. There are several places where the pull-up
A separate 5V power supply is required when using a
different SPI master microcontroller board. The DC2026
J1 header provides power for the isoSPI IC through the
14-pin ribbon cable into the DC2792 J1 header or the
DC1941 J2 header. Refer to demo manual DC2792A
or demo manual DC1941D for external power supply
instructions.
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DEMO MANUAL DC2350A
DC2026 TO DC2350 SPI CONNECTION
An SPI connection begins with the SPI master connected to the first (or “bottom”) DC2350. Additional
DC2350 boards can be daisy-chained onto the isoSPI
bus. Communication begins from the first (or “bottom”)
DC2350 then to the next “upper” DC2350 then finally to
the last (or “top”) DC2350.
3. Connect or daisy-chain the DC2350 to another DC2350
in isoSPI mode. This DC2350 is the last (or “top”) board
of a two-board stack. More DC2350 “upper” boards
can be daisy-chained together in the same manner.
Figure 1 shows the following connections for two boards
on a stack interfaced to a PC:
a. Connect a RJ45 patch cable from the “bottom” DC2350 J1 isoSPI B RJ45 connector to the
next “upper” or “top” DC2350 J2 isoSPI A RJ45
connector.
1. Connect a USB cable from the PC USB port to the
DC2026 J5 connector.
b. Set the next “upper” or “top” DC2350 JP1–JP3 to
1 for isoSPI communication.
2. Connect the DC2026 to the DC2350 in SPI mode. This
DC2350 is the first (or “bottom”) board of the stack.
4. CAUTION! Prevent damage to the DC2350. Refer to
Tables 1 and 2 and confirm that the cell-voltage connections to screw-terminal block matches the J4 pinout
of the DC2350 version being used.
a. Connect a 14-pin ribbon cable from the DC2026 J1
header to the “bottom” DC2350 J3 header.
a. Plug the screw-terminal blocks into the J4 cellvoltage connectors.
b. Set JP1–JP3 to 0 for SPI communication.
c. JP4 can be 0 or 1 depending if the Discharge Timer
function is being used.
5. Refer to the Software Setup section of this demo manual
to properly setup the PC with the Arduino IDE software
to allow communication to the DC2350 boards.
J4
DC2350
1
0
SWTEN
0
1
1
0
JP1
JP2
J3
JP3
isoSPI A isoSPI B
J2
J1
ISOMD
1
JP4
JP1
J3
JP2
J1
JP3
JP4
USB
J5
ISOMD
SWTEN
0
DC2026
J4
DC2350
isoSPI A isoSPI B
J2
J1
2350A F01
Figure 1. DC2026 SPI Connection to the “Bottom” DC2350 in a Two-Board DC2350 Stack
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DEMO MANUAL DC2350A
DC2792 TO DC2350 TYPICAL isoSPI CONNECTION
A typical isoSPI connection begins with the isoSPI master
connected to the first (or “bottom”) DC2350. Additional
DC2350 boards can be daisy-chained onto the isoSPI
bus. Communication begins from the first (or “bottom”)
DC2350 then to the next “upper” DC2350 then finally to
the last (or “top”) DC2350.
c. JP4 can be 0 or 1 depending if the Discharge Timer
function is being used.
4. Connect or daisy-chain the DC2350 to another DC2350
in isoSPI mode. This DC2350 is the last (or “top”) board
of a two-board stack. More DC2350 “upper” boards
can be daisy-chained together in the same manner.
Figure 2 shows the following connections for two boards
on a stack interfaced to a PC:
1. Connect a USB cable from the PC USB port to the
DC2026 J5 connector.
a. Connect a RJ45 patch cable from the “bottom” DC2350 J1 isoSPI B RJ45 connector to the
next “upper” or “top” DC2350 J2 isoSPI A RJ45
connector.
2. Connect the DC2026 to the DC2792 Dual Master isoSPI
demo board.
b. Set the next “upper” or “top” DC2350 JP1–JP3 to
1 for isoSPI communication.
a. Connect a 14-pin ribbon cable from the DC2026 J1
header to the DC2792 J1 header.
5. CAUTION! Prevent damage to the DC2350. Refer to
Tables 1 and 2 and confirm that the cell-voltage connections to screw-terminal block matches the J4 pinout
of the DC2350 version being used.
3. Connect the DC2792 to the DC2350 in isoSPI mode.
This DC2350 is the first (or “bottom”) board of the
stack.
a. Plug the screw-terminal blocks into the J4 cellvoltage connectors.
a. Connect a RJ45 patch cable from the DC2792 J2
MAIN RJ45 connector to the “bottom” DC2350 J2
isoSPI A RJ45 connector.
6. Refer to the Software Setup section of this demo manual
to properly setup the PC with the Arduino IDE software
to allow communication to the DC2350 boards.
b. Set the “bottom” DC2350 JP1–JP3 to 1 for isoSPI
communication.
J4
DC2350
ISOMD
SWTEN
0
1
1
J3
MAIN
J2
JP1
isoSPI A isoSPI B
J2
J1
0
1
JP2
J1
1
ISOMD
JP3
J5
SWTEN
0
JP4
J1
USB
0
JP1
DC2792
JP2
DC2026
JP3
JP4
J3
J4
DC2350
isoSPI A isoSPI B
J2
J1
2350A F02
AUX
J3
Figure 2. DC2792 Typical isoSPI Connection to the “Bottom” DC2350 in a Two-Board DC2350 Stack
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DEMO MANUAL DC2350A
DC2792 TO DC2350 REVERSE isoSPI CONNECTION
A reverse isoSPI connection begins with the isoSPI master connected to the last (or “top”) DC2350. Additional
DC2350 boards can be daisy-chained onto the isoSPI bus.
Communication begins from the last (or “top”) DC2350
then to the next “lower” DC2350 then finally to the first
(or “bottom”) DC2350.
Figure 3 shows the following connections for two boards
on a stack interfaced to a PC:
c. JP4 can be 0 or 1 depending if the Discharge Timer
function is being used.
4. Connect or daisy-chain the DC2350 to another DC2350
in isoSPI mode. This DC2350 is the first (or “bottom”)
board of a two-board stack. More DC2350 “lower” boards
can be daisy-chained together in the same manner.
a. Connect a RJ45 patch cable from the “top” DC2350
J2 isoSPI A RJ45 connector to the next “lower” or
“bottom” DC2350 J1 isoSPI B RJ45 connector.
1. Connect a USB cable from the PC USB port to the
DC2026 J5 connector.
2. Connect the DC2026 to the DC2792 Dual Master isoSPI
demo board.
a. Connect a 14-pin ribbon cable from the DC2026 J1
header to the DC2792 J1 header.
3. Connect the DC2792 to the DC2350 in isoSPI mode. This
DC2350 is the last (or “top”) board of a two-board stack.
a. Connect a RJ45 patch cable from the DC2792 J2
MAIN RJ45 connector to the “top” DC2350 J1 isoSPI B RJ45 connector.
b. Set the “top” DC2350 JP1–JP3 to 1 for isoSPI
communication.
MAIN
J2
AUX
J3
JP4
JP2
JP2
JP3
JP3
ISOMD
JP1
JP1
0
SWTEN
0
DC2350
isoSPI A isoSPI B
J2
J1
JP4
1
1
1
SWTEN
0
J4
J1
6. Refer to the Software Setup section of this demo manual
to properly setup the PC with the Arduino IDE software
to allow communication to the DC2350 boards.
J3
J5
a. Plug the screw-terminal blocks into the J4 cellvoltage connectors.
isoSPI A isoSPI B
J2
J1
J1
USB
5. CAUTION! Prevent damage to the DC2350. Refer to
Tables 1 and 2 and confirm that the cell-voltage connections to screw-terminal block matches the J4 pinout
of the DC2350 version being used.
J3
DC2792
DC2026
b. Set the next “lower” or “bottom” DC2350 JP1–JP3
to 1 for isoSPI communication.
DC2350
1
ISOMD
0
J4
2350A F03
Figure 3. DC2792 Reverse isoSPI Connection to the “Top” DC2350 in a Two-Board DC2350 Stack
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DEMO MANUAL DC2350A
DC2792 TO DC2350 REDUNDANT isoSPI CONNECTION
A redundant isoSPI connection begins with the primary
(or “main”) isoSPI master connected to the first (or
“bottom”) DC2350 and has a backup auxiliary (or “aux”)
isoSPI master connected to the last (or “top”) DC2350.
Additional DC2350 boards can be daisy-chained between
the two isoSPI masters on the isoSPI bus. Primary (or
“main”) communication begins from the first (or “bottom”) DC2350 then to the next “upper” DC2350 then
finally to the last (or “top”) DC2350. The backup auxiliary
(or “aux”) communication begins in the reverse direction
to provide coverage when a possible isoSPI daisy-chain
break occurs.
c. JP4 can be 0 or 1 depending if the Discharge Timer
function is being used.
4. Connect or daisy-chain the DC2350 to another DC2350
in isoSPI mode. This DC2350 is the last (or “top”) board
of a two-board stack. More DC2350 “upper” boards
can be daisy-chained together in the same manner.
a. Connect a RJ45 patch cable from the “bottom”
DC2350 J1 isoSPI B RJ45 connector to the next
“upper” or “top” DC2350 J2 isoSPI A RJ45 connector.
b. Set the next “upper” or “top” DC2350 JP1–JP3 to
1 for isoSPI communication.
Figure 4 shows the following connections for two boards
on a stack interfaced to a PC:
5. Connect the DC2792 auxiliary (or “aux”) isoSPI master
to the last (or “top”) DC2350 board of the stack.
1. Connect a USB cable from the PC USB port to the
DC2026 J5 connector.
a. Connect a RJ45 patch cable from the DC2792 J3
AUX RJ45 connector to the “top” DC2350 J1 isoSPI B RJ45 connector.
2. Connect the DC2026 to the DC2792 Dual Master isoSPI
demo board.
6. CAUTION! Prevent damage to the DC2350. Refer to
Tables 1 and 2 and confirm that the cell-voltage connections to screw-terminal block matches the J4 pinout
of the DC2350 version being used.
a. Connect a 14-pin ribbon cable from the DC2026 J1
header to the DC2792 J1 header.
3. Connect the DC2792 primary (or “main”) isoSPI master
to the first (or “bottom”) DC2350 board of the stack.
a. Plug screw-terminal blocks into the J4 cell-voltage
connectors.
a. Connect a RJ45 patch cable from the DC2792 J2
MAIN RJ45 connector to the “bottom” DC2350 J2
isoSPI A RJ45 connector.
7. Refer to the Software Setup section of this demo manual
to properly setup the PC with the Arduino IDE software
to allow communication to the DC2350 boards.
b. Set the “bottom” DC2350 JP1–JP3 to 1 for isoSPI
communication.
J4
DC2350
ISOMD
SWTEN
0
1
1
J3
JP1
isoSPI A isoSPI B
J2
J1
0
1
JP2
J1
1
ISOMD
JP3
J5
SWTEN
0
JP4
J1
USB
0
JP1
DC2792
JP2
DC2026
JP3
JP4
J3
J4
DC2350
isoSPI A isoSPI B
J2
J1
MAIN
J2
2350A F04
AUX
J3
Figure 4. DC2792 Redundant isoSPI Connections to the “Bottom” and “Top”DC2350 in a Two-Board DC2350 Stack
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DEMO MANUAL DC2350A
DC1941 isoSPI MASTER SETTINGS
The DC1941 jumpers must first be properly set to interface between DC2026 and DC2350.
Figure 5 shows the proper board settings.
1. JP2: VCC = DC590.
Refer to Demo Manual DC1941D for jumper setting
details.
2. JP3: ENABLE = EN.
3. JP4: SLOW = 0.
4. JP5: MODE = MASTER.
5. JP6: VCCS = VCC.
6. JP7: PHA = 1.
7. JP8: POL = 1.
8. JP9, JP10: VTH = VTH2.
DC1941
VCCS
GND
EN
VTH2
VTH2
SLP_EN
VTH1
VTH1
VCC
VCC
JP9
JP10
JP3
J2
J1
GND
VCCS
PHA
POL
SLOW
DC590
VCC
1
1
1
MASTER
EXT
EXT
0
0
0
SLAVE
JP5
JP4
JP8
JP7
JP6
JP2
2350A F05
Figure 5. DC1941 isoSPI Master Mode Jumper Settings
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DEMO MANUAL DC2350A
DC1941 TO DC2350 TYPICAL isoSPI CONNECTION
A typical isoSPI connection begins with the isoSPI master
connected to the first (or “bottom”) DC2350. Additional
DC2350 boards can be daisy-chained onto the isoSPI
bus. Communication begins from the first (or “bottom”)
DC2350 then to the next “upper” DC2350 then finally to
the last (or “top”) DC2350.
b. Set the “bottom” DC2350 JP1–JP3 to 1 for isoSPI
communication.
c. JP4 can be 0 or 1 depending if the Discharge Timer
function is being used.
5. Connect or daisy-chain the DC2350 to another DC2350
in isoSPI mode. This DC2350 is the last (or “top”) board
of a two-board stack. More DC2350 “upper” boards
can be daisy-chained together in the same manner.
Figure 6 shows the following connections for two boards
on a stack interfaced to a PC:
1. Connect a USB cable from the PC USB port to the
DC2026 J5 connector.
a. Connect a RJ45 patch cable from the “bottom” DC2350 J1 isoSPI B RJ45 connector to the
next “upper” or “top” DC2350 J2 isoSPI A RJ45
connector.
2. Connect the DC2026 to the DC1941 isoSPI demo board.
a. Connect a 14-pin ribbon cable from the DC2026 J1
header to the DC1941 J2 header.
b. Set the next “upper” or “top” DC2350 JP1–JP3 to
1 for isoSPI communication.
3. Refer to the DC1941 isoSPI Master Settings section of
this demo manual to properly setup the DC1941.
6. CAUTION! Prevent damage to the DC2350. Refer to
Tables 1 and 2 and confirm that the cell-voltage connections to screw-terminal block matches the J4 pinout
of the DC2350 version being used.
4. Connect the DC1941 to the DC2350 in isoSPI mode.
This DC2350 is the first (or “bottom”) board of the
stack.
a. Plug the screw-terminal blocks into the J4 cellvoltage connectors.
a. Connect a RJ45 patch cable from the DC1941 J1
RJ45 connector to the “bottom” DC2350 J2 isoSPI A RJ45 connector.
7. Refer to the Software Setup section of this demo manual
to properly setup the PC with the Arduino IDE software
to allow communication to the DC2350 boards.
J4
DC2350
ISOMD
SWTEN
0
1
SWTEN
0
1
1
0
J3
JP1
JP2
JP3
isoSPI A isoSPI B
J2
J1
ISOMD
1
JP4
J2
0
JP1
DC2026
JP2
J3
JP3
JP4
DC1941
J4
DC2350
isoSPI A isoSPI B
J2
J1
J1
USB
2350A F06
J5
J1
Figure 6. DC1941 Typical isoSPI Connection to the “Bottom” DC2350 in a Two-Board DC2350 Stack
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DEMO MANUAL DC2350A
DC1941 TO DC2350 REVERSE isoSPI CONNECTION
A reverse isoSPI connection begins with the isoSPI master connected to the last (or “top”) DC2350. Additional
DC2350 boards can be daisy-chained onto the isoSPI bus.
Communication begins from the last (or “top”) DC2350
then to the next “lower” DC2350 then finally to the first
(or “bottom”) DC2350.
Figure 7 shows the following connections for two boards
on a stack interfaced to a PC:
1. Connect a USB cable from the PC USB port to the
DC2026 J5 connector.
b. Set the “top” DC2350 JP1–JP3 to 1 for isoSPI
communication.
c. JP4 can be 0 or 1 depending if the Discharge Timer
function is being used.
5. Connect or daisy-chain the DC2350 to another DC2350
in isoSPI mode. This DC2350 is the first (or “bottom”)
board of a two-board stack. More DC2350 “lower” boards
can be daisy-chained together in the same manner.
2. Connect the DC2026 to the DC1941 isoSPI demo board.
a. Connect a RJ45 patch cable from the “top” DC2350
J2 isoSPI A RJ45 connector to the next “lower” or
“bottom” DC2350 J1 isoSPI B RJ45 connector.
a. Connect a 14-pin ribbon cable from the DC2026 J1
header to the DC1941 J2 header.
b. Set the next “lower” or “bottom” DC2350 JP1–JP3
to 1 for isoSPI communication.
3. Refer to the DC1941 isoSPI Master Settings section of
this demo manual to properly setup the DC1941.
6. CAUTION! Prevent damage to the DC2350. Refer to
Tables 1 and 2 and confirm that the cell-voltage connections to screw-terminal block matches the J4 pinout
of the DC2350 version being used.
4. Connect the DC1941 to the DC2350 in isoSPI mode.
This DC2350 is the last (or “top”) board of a two-board
stack.
a. Connect a RJ45 patch cable from the DC1941 J1
RJ45 connector to the “top” DC2350 J1 isoSPI B
RJ45 connector.
a. Plug the screw-terminal blocks into the J4 cellvoltage connectors.
7. Refer to the Software Setup section of this demo manual
to properly setup the PC with the Arduino IDE software
to allow communication to the DC2350 boards.
DC1941
DC2026
J2
J1
USB
J1
JP4
JP2
JP3
JP1
0
SWTEN
0
ISOMD
JP2
isoSPI A isoSPI B
J2
J1
JP4
1
1
DC2350
J3
JP3
isoSPI A isoSPI B
J2
J1
JP1
J3
1
SWTEN
0
J4
J5
DC2350
1
ISOMD
0
J4
2350A F07
Figure 7. DC1941 Reverse isoSPI Connection to the “Top” DC2350 in a Two-Board DC2350 Stack
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DEMO MANUAL DC2350A
SOFTWARE SETUP
The DC2350 can be controlled by the DC2026
Linduino One board. The DC2026 is part of the Arduino
compatible Linduino platform that provides example code
that will demonstrate how to control the multicell battery
stack monitor ICs. Compared to most Arduino compatible
microcontroller boards, the DC2026 offers conveniences
such as an isolated USB connection to the PC, built-in
SPI MISO line pull-up to properly interface with the battery stack monitor IC open drain SDO, and an easy ribbon cable connection for SPI communication through the
DC2350 14-pin QuikEval J3 connector.
Arduino IDE Setup
1. Download then install the Arduino IDE onto the PC.
Detailed instructions can be found at www.linear.com/
solutions/linduino under the quick start tab.
2. Set the Arduino IDE to open BMS Sketchbooks. From
within the Arduino IDE, click on File menu select
Preferences. Then under Sketchbook location:
select Browse, and locate the path to the extracted
bmsSketchbookBeta.zip file that was provided by ADI.
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DEMO MANUAL DC2350A
SOFTWARE SETUP
3. Close then re-open the Arduino IDE to enable the use
of the Sketchbook Location that was previously set.
4. Select the correct COM port to allow communication
to DC2026 through USB. Under the Tools menu, select
Port → Select the highest number COMxx with the “ü”
checkmark symbol. There may be more than one option;
DC2026 is usually the highest COM port number. The
PC screenshots used in this example show the DC2026
connected to COM6.
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DEMO MANUAL DC2350A
SOFTWARE SETUP
5. Select the correct Arduino compatible microcontroller
board. Under the Tools menu, select Board → Arduino/
Genuino Uno with the “l” black dot symbol.
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DEMO MANUAL DC2350A
SOFTWARE SETUP
6. Open one of the programs or “sketches” associated
with the DC2350. In this example, LTC6813-1 sketch
will be opened instead of a LTC6812-1 sketch. Under
the File menu, select Sketchbook → Part Number →
6813 → DC2350_6813.
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DEMO MANUAL DC2350A
SOFTWARE SETUP
7. Upload the DC2350_6813 sketch onto the DC2026 by
clicking on the Upload button on the top left corner.
When this process is completed there will be a “Done
uploading” message on the bottom left corner.
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DEMO MANUAL DC2350A
SOFTWARE SETUP
8. Open the Arduino Serial Monitor tool. Click on the
Serial Monitor button on the top right corner then the
Serial Monitor window will open and show on the top
left corner the COMxx used.
9. Configure the Serial Monitor to allow communication to
the DC2026 through USB. On the bottom of the Serial
Monitor window, set the following, starting from bottom
left to bottom right:
a. Click on the Autoscroll checkbox for the “ü” checkmark symbol.
b. Select Both NL & CR on the left dropdown menu.
c. Select 115200 baud on the right dropdown menu.
d. As shown below, when configured correctly the
DC2350_6813 sketch menu will appear.
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DEMO MANUAL DC2350A
APPENDIX A THE SKETCHBOOK CONTENTS
The bmsSketchbook will generally contain the following folders: Libraries, Part Number, Documentation, and
Utilities.
Libraries directory: contains a subdirectory for each IC
in the sketchbook. Each subdirectory contains a .cpp and
.h file. These files contain all of the constant definitions
and low-level IC command implementations. Porting to a
different microcontroller requires changes to some library
files.
Part Number directory: contains example control programs for each IC. Inside the Part Number folder, each
BMS IC has a sketch(.ino) file that implements a control
program to evaluate the functionality of the IC. This sketch
allows the user to control the IC through a serial terminal
and make all primary measurements. This sketch also
allows for evaluation of self-test and discharge features
of the IC. Generally, the name of a sketch relates to the
IC’s demo board. For example, the sketch for LTC6804
is DC1942.ino, for LTC6811 it is DC2259.ino, and for
LTC6813 it is DC2350_6813.ino.
Utilities directory: contains support programs, including
a program that emulates a standard Linear Technology
DC590 isolated USB to serial controller.
Documentation directory: contains html documentation
for the provided code base. Documentation for all of the
BMS ICs can be accessed by opening the Linduino.html
file, as found in the main sketchbook directory (shown
below) and in the Documentation directory.
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DEMO MANUAL DC2350A
APPENDIX A THE SKETCHBOOK CONTENTS
What Is A Sketch
A “sketch” is simply another word for a microcontroller/
Linduino program. The term is generally only used when
referring to Arduino based programs, as sketches have
several abstractions that remove some of the complexity of a standard microcontroller(MCU) program. All
sketches contains two primary functions, the setup() and
the loop() function. These are in fact the only functions
that are mandatory in a sketch and are almost always
implemented in some form in a typical MCU program. The
setup() function is run once at power on or after the MCU
is reset. The setup() function generally is used to initialize the MCU peripheral circuits and to initialize all of the
control variables. The loop() function is similar to a main()
function that has implemented an infinite loop inside a
standard C program. The code within the loop() function
is typically where the primary program code is placed.
The code within the loop() function will repeat infinitely.
Sketch Modifications
Sketches can be modified to a set of applications specific requirements. All sketches are written such that the
most common modifications can be made by changing
the variables listed in the /*Setup Variables */ table at the
top of the sketch. For reference, example modifications
to a DC2259 (LTC6811) sketch are shown below. These
modifications are applicable to most of the available BMS
ICs in the sketchbook.
Common modifications can be made by changing the
Setup Variables. The most common application changes
are listed below. After the variables are changed, the
sketch will need to be recompiled and uploaded to the
Linduino.
2. Often an application may need to sample data at a rate
faster than the default 500ms (2Hz). To modify the loop/
sample rate the MEASUREMENT_LOOP_TIME variable
should be changed. The loop time must be entered in
milliseconds and should be a number larger than 20ms.
To change the loop rate to roughly 10 measurements
a second the loop rate should be changed to 100mS.
The modified line will look like:
const uint16_t MEASUREMENT_LOOP_TIME = 100;
3. It is possible to modify which measurements fall within
the loop during the Loop Measurements command. The
following list are the measurements that can be looped:
const uint8_t MEASURE_CELL = ENABLED;
// This is ENABLED or DISABLED
const uint8_t MEASURE_AUX = DISABLED;
// This is ENABLED or DISABLED
const uint8_t MEASURE_STAT = DISABLED;
//This is ENABLED or DISABLED
By default only a cell measurement is done, as noted
by MEASURE_CELL = ENABLED. What measurements
are made can be changed by setting what the Measure
field is equal to. To Measure Cells and the Status register
but not the AUX register, the variables would be setup
as shown below:
const uint8_t MEASURE_CELL = ENABLED;
// This is ENABLED or DISABLED
const uint8_t MEASURE_AUX = DISABLED;
// This is ENABLED or DISABLED
const uint8_t MEASURE_STAT = ENABLED;
//This is ENABLED or DISABLED
1. To change the number of ICs in the isoSPI network,
change the TOTAL_IC variable. A number between 1
and 4 should be entered. In an application that has 2
devices in the network the modified line will look like:
const uint8_t TOTAL_IC = 2;
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DEMO MANUAL DC2350A
APPENDIX A THE SKETCHBOOK CONTENTS
4. ADC conversion settings can also be modified in the
Setup Variables section. The default setup is to run the
ADC in ‘Normal’ mode, which has a 7kHz filter code;
in this mode the ADC_OPT bit is Disabled. Typical
choice for which cell to convert is ALL. Full ADC
conversion programming requires setting ADC_OPT,
ADC_CONVERSION_MODE, CELL_CH_TO_CONVERT,
AUX_CH_TO_CONVERT and STAT_CH_TO_CONVERT.
These variables are programmed with constants listed
in the LTC68xy_daisy.h file. For simplicity they are also
listed below:
MD_422HZ_1KHZ
MD_27KHZ_14KHZ
MD_7KHZ_3KHZ
MD_26HZ_2KHZ
ADC_OPT_ENABLED
ADC_OPT_DISABLED
To set the ADC to have a 1kHz filter corner the ADC_OPT
and ADC_CONVERSION_MODE variables would be
changed to:
ADC_OPT = ADC_OPT_ENABLED;
ADC_CONVERSION_MODE = MD_422HZ_1KHZ;
To convert only cells 2 and 8,
CELL_CH_TO_CONVERT = CELL_CH_2and8;
5. In another example, the user may wish to change the
undervoltage and overvoltage thresholds. Each number
is based on an LSB of 100µV.
//Under Voltage and Over Voltage Thresholds
const uint16_t OV_THRESHOLD = 41000;
// Over voltage threshold ADC Code. LSB = 0.0001
const uint16_t UV_THRESHOLD = 30000;
// Under voltage threshold ADC Code. LSB = 0.0001
CELL_CH_ALL
CELL_CH_1and7
CELL_CH_2and8
CELL_CH_3and9
CELL_CH_4and10
CELL_CH_5and11
CELL_CH_6and12
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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.
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DEMO MANUAL DC2350A
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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LT 0118 • PRINTED IN USA
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