DC1835A
May 30, 2014
LTC6803-4 Battery Monitor
HARDWARE/SOFTWARE DEMONSTRATION BOARD MANUAL
DESCRIPTION
0B
LTC6803-4 KEY FEATURES
Evaluation circuit DC1835A is a Battery Monitoring
System to demonstrate the functional operation of the
LTC6803-4 integrated circuit. The design includes the
ability to bus up to 10 devices with built-in board-toboard ribbon-cable interconnects and selectively apply
resistive loading to any cell for purposes of “Passive
Balancing.” Additionally, the board includes a DC-DC
boost conversion section to power the IC from an isolated external 5V supply. The external 5V supply also
powers a data isolator so that the user SPI data bus is
floating with respect to the monitored cells.
1B
Separate Cell 0 ADC input (bottom-cell connection).
Conversion range down to –300mV per cell.
Addressable SPI interface (up to 16 devices).
Packet Error Checking on command writes.
6X lower standby current than LTC6802.
Power-down mode for “no battery drain”.
Active pullup on discharge-control outputs (S pins).
Extensive diagnostic commands.
DC1835A DEMO FEATURES
2B
CELLS CONNECTOR (SEPARABLE)
DISCHARGE SWITCHES
DC-DC
BOOST
SPI
ADDRESS
OUTPUT
BITS
LTC6803-4
SPI
INPUT
DATA &
POWER
ISOLATOR
Fully isolated data and power interface- no powering
from cells.
On-board 54V boost supply.
Controllable discharging for Passive Balancing.
Graphical User Interface (GUI) screen for demonstration of new features and program code development.
Dual SPI connectors for interconnecting multiple
boards
DC1835A
GETTING STARTED WITH ONE BOARD CONNECTED
3B
SINGLE BOARD CONNECTION TO PC AND GUI
5B
Step 1. Set jumpers on DC1835A to the default positions indicated in Table 1.
TABLE 1. JUMPER FUNCTIONS
6B
JUMPER
FUNCTION
DEFAULT
POSITION
1
JP1
Top of Stack (TOS)
JP2-JP5
A0, A1, A2, A3
(address)
0
JP6
+5V Source
EXT
DEFAULT POSITION
Indicates that the cells monitored by the
board are at the top of the battery stack to
provide primary toggle polling. Only one device should form the toggle frequency.
Sets hexadecimal address nibble to 0x0
Power is furnished by the External 5V turret
connections.
Step 2. Connect an un-energized 5V supply to the External 5V power turrets (labeled EXT +5V and
HOST GND). The supply will have the same ground
potential as the ribbon signals in the SPI bus.
Step 3. Power up 5V supply. Current draw should be
about 22mA.
Step 4. Connect DC590B Quick Eval USB cable to
PC/Laptop USB port. Connect ribbon cable from
DC590B to the SPI BUS IN port of DC1835A (H1).
Make sure that the driver for DC590B has been
downloaded from www.linear.com and installed on
the computer. This can be verified by running
Quick Eval and seeing the message that there is a
missing module for this board type. Close the
Quick Eval program and then launch only the control program:
HU
UH
LTC6803-2-4_GUI_Vxx_yyyymmdd.exe
When the DC590B Quick Eval board recognizes the
String ID code from the DC1835A board, the program will open and present the control screen.
This sometimes requires two launches of the GUI
program to properly initialize.
2
ALTERNATIVE POSITION
Forces device into the secondary toggle polling
mode.
Setting bits to 1 configures different device
addresses, Used in the event there are multiple
LTC6803-4 in a SPI bus.
Power is taken from the SPI BUS IN connection.
A DC590B board has a required pull-up resistor for
the SDO line already connected. If a system other
than DC590 is driving the SPI interface, there
must be a pull-up resistor installed in location
R60 (0603 size, 2KΩ to 5KΩ is suitable). This
pull-up resistor was not added to the DC1835A because it would demand too much drive current for
bussed operation on a multiple board setup.
Step 5. Connect the cells to be monitored to the cells
connector J1. This connector is in two pieces. The
setscrew piece can be unplugged to make it safer
to attach wiring from a three to twelve cell battery
stack. The LTC6803-4 is intended to measure from
three to twelve individual cells with a total stack
voltage of 9V to 51V.
With fewer than 12 cells to be monitored, the bottom cell of the stack should always be connected
as Cell 1 between terminals J1-5(+cell contact) and
J1-4(-cell contact). Terminal J1-4, is the Cell 0 reference point for the battery cell stack. The second
cell on the stack connects between terminals J16(+cell contact) and J1-5(-cell contact). All higher
numbered terminals on J1 not used for cell connections may be shorted together with the top po-
DC1835A
tential or left open. Figure 1 illustrates a connection
for fewer than 12 cells.
SPECIAL NOTE FOR DEMONSTRATION PURPOSES
7B
DC1835A and the GUI program are useful to serve as a
demonstration tool to highlight the features of the
LTC6803-4. If actual battery cells are not available, a
series string of 150Ω resistors connected between
each of the J1 connector terminals can be used instead. Each resistor will serve as a cell voltage. A lab
power supply voltage of 9V to 51V can be connected
across the resistor string between terminals J1-16(+)
and J1-4(-).
When using resistors instead of cells, the discharge
indicating LEDs on the DC1835A board may not light
due to limited available current in the resistor-string.
Step 6. Mate the J1 battery connector.
Inserting the setscrew piece into connector J1 will
apply signals to the board from the battery cell
stack. For the demo set up simply turn on the lab
power supply preset to a voltage between 10V and
50V.
Figure 1. Typical connection of four cells.
3
DC1835A
THE CONTROL PROGRAM
THE GRAPHICAL USER INTERFACE (GUI) SCREEN
8B
Figure 2 shows the control panel that appears on the
computer screen. The DC1835A board must be connected to the DC590 interface card for the program to
open. The control screen will close if any of the boards
are disconnected. Controls on this panel are used to
communicate with the LTC6803-4. Commands are issued and information is retrieved and displayed on this
screen. This panel is useful not only for demonstrating
Figure 2. GUI Control Panel Start-up Screen
4
the operation of the LTC6803-4, but also for software
developers to observe the Hex codes exchanged with
the device.
The control screen makes good use of color to provide
cell status and operating conditions at a glance. White
indicates non-existent or stale data. A step by step
procedure for one board connected to a stack of cells
follows to explain the operation of the control panel.
Sections are highlighted for each procedure.
DC1835A
OPERATING THE CONTROL
SCREEN
4B
FIRST THINGS FIRST
9B
Figure 2 is the initial start-up screen that appears when
the program is launched and the Quick Eval interface
card recognizes that the DC1835A board is connected.
Once 5V power is supplied to the board, the communication between the PC and the board can be checked.
The DC590 may partially power the circuit via the SPI
signals, but this is not a recommended practice.
1: READ CONFIGURATION
10B
command and received by the GUI, the control program calculates a PEC in the same manner. This byte
is compared with the appended receive byte to check
that the data transmission was properly executed. The
Received PEC byte and the calculated PEC from the
received data are displayed in the top section labeled
PACKET ERROR CODE and both bytes should match.
The oval located at the top of the color-coded status
panel for the one board will turn green if the PEC bytes
match. Data transmission errors will produce red
warning indications if the PEC bytes do not match.
There is also a display of the PEC that was sent with
the most recent command to the LTC6803, which had
to match an internally calculated value to be accepted
as a valid command.
2: WRITE CONFIGURATION
1B
Click the command button labeled READ CONFIG. If all
is properly connected and operating the start-up default configuration of the LTC6803-4 will be read from
the board. The Hex codes for the six bytes of configuration setting will appear in the CONFIGURATION
REGISTERS section in the boxes labeled
CONFIGURATION READ FROM LTC6803. The initial
configuration bytes should be 0xE0 for register 0 and
0x00 for the other five bytes. This default configuration is the standby mode for the LTC6803. To enable
the device and begin taking cell voltage measurements, a CDC (Comparator Duty Cycle) setting other
than Standby (like CDC=1) must be selected from
the SET I/O MODE set CDC selection box at the bottom of the GUI screen. Once chosen, a WRITE
CONFIG command must be executed.
Nothing is changed within the LTC6803 until the Write
Configuration command is executed. Clicking the
WRITE CONFIG command button does this. When the
command is sent, the six Hex bytes shown in the
CONFIGURATION REGISTERS section in the boxes
labeled CONFIGURATION WRITTEN TO LTC6803 will
become bold type. Software developers can note the
exact hex values required by the LTC6803 for specific
conditions in these boxes to facilitate their control program development.
Clicking the READ CONFIG button can see confirmation that the configuration change was actually made.
The six bytes read back should match the six bytes
sent and the PEC/CRC check bytes should be a match
(green PEC oval on stack display).
When any configuration information is changed on the
screen the WRITE CONFIG command button will be
back-lit illuminated. This serves as a reminder that this
command still needs to be executed.
IMPORTANT NOTE
12B
No configuration changes take effect until the
WRITE CONFIG button is clicked. The GUI provides
a periodic background command so that watchdog
does not trigger a CDC reset back to 0.
32B
In addition the LTC6803 calculates a Packet Error
Code, PEC, and appends it to the data stream each
time it sends out data. For the six bytes sent by this
5
DC1835A
3: PROGRAM THE CELL MONITORING VOLTAGE
THRESHOLDS
5: READ FLAGS
15B
13B
In the section labeled SET VOLTAGE LIMITS click on
the boxes and enter voltage values for the over-voltage
and under-voltage thresholds required for the cells being monitored. The voltage value entered will be
rounded to the actual value used by the LTC6803 and
displayed in the box. The voltage ranges for these thresholds is -0.74V to 5.35V and the program will not allow the under-voltage to be greater than the overvoltage threshold.
When any cell in a stack exceeds the programmed over
or under voltage threshold limit, one of two flag bits is
set in an internal register for that cell to serve as a
warning. This is important feedback for battery charging algorithms to know when to start or stop charging.
To read the state of these warning flags at any time is a
simple click of the READ FLAG command button. The
Hex code for the three flag bytes appears in the FLAG
REGISTERS section of the control panel.
One of the configuration options is to mask these flags
from appearing in the register bytes that are read from
the LTC6803. This feature can be used to prevent or
allow these flags to affect a control algorithm. A check
box is provided for each cell in a stack to select the
mask interrupt option for that cell. To implement the
masking requires checking the box and then writing
the new configuration with a WRITE CONFIG button
push.
These monitor thresholds can be applied globally to
each and every cell in the system or customized for the
cells connected to an individual board by clicking the
desired option button. Individual boards are selected
for programming by the left hand tabs in multiple
board systems.
4: READ CELL VOLTAGES
14B
The essential function of the LTC6803 is to measure
and report the voltage on each battery cell when commanded. Once again this is accomplished from the
control screen with two command button clicks. First
click on the START CELL VOLTAGE button. This commands an A/D conversion of all 12-cell voltages in the
time configured from the selected Set CDC option in
the SET I/O MODE box. The actual cell voltage measurements are not displayed until the READ CELL
VOLTAGE command button is clicked.
6
If the measured voltage of a cell is within the monitoring thresholds all indications for the cell appear green.
DC1835A
6: READ AN INDIVIDUAL CELL OR TEMPERATURE
5: READ TEMPERATURE
17B
16B
The LTC6803 has three ADC channels dedicated to
measuring temperature. The temperature indications
are for the internal die temperature of the LTC6803 and
two external signals, typically from thermistors. The
display returns a voltage measurement.
The internal die temperature sensor produces a voltage
that changes at a rate of 8mV/°C relative to absolute
zero. To convert the voltage reading to degrees Celsius, divide the voltage by 8mV then subtract 273°C.
For example, 25°C is a nominal reading of 2.384V.
Each cell and each temperature channel has a check
box to allow individual measurements. Checking
these “Only” boxes sends the command (STARTCELL
VOLT then READCELL VOLT, START TEMP then READ
TEMP) to read only that channel and display its
status. Cell 8 and Internal Temp are shown in the
example screen above. Older or stale readings for all
other cells and temperatures are faded out.
18B
The DC1835A dedicates ETMP1 (data from the
VTEMP1 pin) to a measurement of the full-stack voltage. The 1:12 resistor divider comprising R54 and
R55 places a down-scaled signal on VTEMP1 when
FET Q13 is activated by power-up of the circuitry. The
VTEMP2 pin is brought out to a solder-pad for user
wiring to an external signal of interest. The VTEMPx
inputs are converted with respect to V- of the LTC6803
and have comparable accuracy to a cell conversion.
To take a temperature reading simple click the START
TEMP command button to make the LTC6803 ADC
conversion followed by clicking the READ TEMP
command button to download the data from the board
and display the voltage readings.
7
DC1835A
OTHER CONTROL FEATURES
8: DISCHARGE CELLS
20B
19B
Three additional command buttons are provided on the
control screen. The POLL ADC and POLL INTERRUPT
command buttons are used to test if the ADC is busy
making conversion and to test if any of the LTC6803
devices in a system have an interrupt condition respectively. The result of these commands can be observed
by monitoring the serial data output (SDO) line of the
SPI interface at J2 (or J3 or J4 if a data isolator is used
as described on pg. 10). There is no indication provided on the control screen.
Another major feature of the LTC6803 is the ability to
remove charge from individual cells. This can help to
distribute the cell charge evenly over a stack of batteries. DC1835A contains a P channel Mosfet in series
with a 33Ω resistor across each cell connection. When
enabled, a cell is loaded and charge is pulled from the
cell with energy dissipated in the switch, resistor, and
green LED.
A check box is provided for each cell to be discharged.
Checking this box (Cell 3 in the above example screen
shot) and then writing the new configuration with a
WRITE CONFIG button push will load the cell.
IMPORTANT NOTE: The discharge transistors are automatically turned off momentarily while the A/D converter is measuring the cell voltage using the normal
STARTCELL VOLT command. This prevents any voltage drop errors caused by the discharge current flowing through the cell inter-connection wiring. An accurate indication of the true state of charge of the cells is
then obtained.
The LTC6803 offers the option of keeping the discharge transistors on while measuring the cell voltages. This is done using the STARTCELL hold DCC
command button. A blue indicator is illuminated when
this command has been executed. This lower voltage
reading also includes I*R errors introduced by cabling
and connectors.
8
The START OPENWIRE command button connects the
built in open wire detection circuitry to all cells. This
command must be followed by READCELL VOLT
command button click to see the result. An open wire
connection to any cell will be indicated by an abnormally high voltage measurement for the cell above the
open wire and a near 0V measurement for the cell with
the open wire.
CONTINUOUS OPERATION
21B
For convenience, the control panel allows for continuous operation of the DC1835A board. The command
button labeled START CONTINUOUS READ CELLS can
be clicked and the board control is placed in a continuous loop executing the following commands automatically in the following sequence:
Start cell voltage
Read cell voltage
Start temp
Read temp
Read flags
All values are updated continually (~800ms update
rate). While running, the configuration can be changed
on the fly. Simply changing a configuration item (Discharge cells for example) and clicking the WRITE
CONFIG button will implement the new configuration
and return to continuous operation.
A green box in the lower right hand corner indicates
that the system is running continuously. A red box
means that the system is stopped and waiting for a
new command to be sent.
DC1835A
DISPLAYING VALID DATA TRANSFERS ONLY
wire test signals can be applied with or without the
discharge transistors active. Checking the functionality
of each bit in the internal data registers for cell voltages
and temperatures can also be seen by choosing which
test code (0x555, 0xAAA, or 0xFFF) to expect to be
returned from the device when a self test command is
issued. Self testing must use CDC mode 1 for correct
results. Tests are initiated with the various ADC command buttons in the self test part of the GUI. The results can be viewed in hexadecimal with the neighboring buttons.
2B
Each time data is transferred from the LTC6803 by the
four READ commands (Cell Voltage, Configuration,
Flag Status and Temperature), a Packet Error Code,
PEC, is appended based on the data stream sent. The
control program also calculates a PEC value based on
the data it receives. If the calculated PEC matches the
transmitted value the data transfer is assumed to be
error free and therefore the data is valid.
If the two PEC values do not match, the transmitted
data stream has been somehow corrupted. This type of
data error becomes more of a concern when boards
are stacked and the transmit data stream is lengthened. The transmitted and calculated PEC values are
displayed on the GUI and turn red when a mismatch
occurs.
LOW CURRENT STANDBY
23B
An important system consideration is the ability to put
the monitoring circuitry into a low current drain condition. This is done by setting the LTC6803 into its
standby configuration. A command button in the lower
right corner of the screen is provided to facilitate this
function. Once pushed all data and configuration settings are reset and the screen goes white on all indicators. While this minimizes the dissipation within the IC,
the bulk of the DC1835A power is to operate the SPI
isolator. To bring the power of the entire circuit to essentially zero, the SPI lines should go low and the external 5V turned off. Since power is never drawn from
the cells (other than microamp-level ADC currents),
there will not be meaningful battery drain unless discharge action is commanded.
SELF TEST & DIAGNOSTIC FUNCTIONS
24B
The LTC6803 has built in self test and diagnostic functions. These commands apply a test signal to the ADC
to check that the internal cell voltage and temperature
connections are functioning. The cell voltage and open
OTHER CONFIGURATION OPTIONS
25B
The SET I/O MODE group of checkboxes can be used
to adjust other features of the LTC6803. Configuring
the general purpose I/O pins and setting the type of
activity polling scheme can be selected then configured
with a WRITE CONFIG button push.
EXTERNAL POWER FUNCTIONS
The DC1835A includes DC-DC conversion technology
that provides isolated +5V, +12V, and –12V from the
external 5V source using the LTM2883-5S data isolator. The V+ of the LTC6803 is powered by 54V generated by an LTC3495-1 boost circuit running off the
isolated +12V. Powering down the external 5V and SPI
signals de-powers the entire circuit. A jumper (JP6)
configures the external source connection as either
from the EXT +5V turrets, or from the SPI BUS IN connector. Since the DC590 cannot reliably furnish the
requisite power for the DC1835A, the EXTernal setting
and a dedicated 5V supply should be used with the first
board in a typical setup.
9
DC1835A
SETTING UP MULTIPLE BOARDS
5. Configure the boards to have unique addresses.
JP2-JP5 set the binary address bits A0-A3 respectively. The GUI can accommodate arbitrary address
assignments, but by default will set addresses incrementally ascending from 0 up to board count
minus 1, so setting the boards accordingly is the
easiest and least confusing setup.
4B
ADD BOARDS TO MEASURE MORE CELLS
Since the DC1835A are equipped with data isolators
and a host-side SPI bus configuration, the circuits have
the ability to communicate to the host along with up to
15 other DC1835A boards, monitoring up to 12 cells
each. The control GUI however is limited to only 10
boards (120 cells maximum). In a multi-board setup,
the power from the first board can be furnished to
subsequent boards through the SPI BUS OUT connector. To stack and control more than one board requires
the following hardware and software modifications:
6. Since all the DC1835A are all powered externally,
they can be powered up and exercised even without any cell connections, though only readings
near zero will be obtained from any floating ADC
inputs.
CAUTION! CAUTION! CAUTION!
28B
MULTI-BOARD HARDWARE ADJUSTMENTS
27B
1. All boards will require the use of external 5V power. The external power can be shared amongst
boards, as the host interfaces will all be at the
same potential. To share power from the first
DC1835A, all but the first board should use the
HOST position for JP6. Each board typically uses
26mA when operating and the one 5V supply at the
first board can power all the boards in this way.
2. The bottom board on the stack, which connects to
a system controller or to a DC590 Quick Eval link
to a PC, must use the SPI BUS IN connector (H1)
as the primary interface. If not using DC590, a
2KΩ to 5KΩ pull-up resistor must be connected
from the SDO output line (connector H1, pin 5) to
the 3V/5V logic power rail of the circuit driving
the SPI port. For convenience, the 0603 size
footprint R60 provides this option.
3. The final board on the top of the stack should have
JP1 (TOS) set to 1. Connect JP1 (TOS) on all other
boards to the 0 position.
4. A ribbon cable must connect the SPI BUS OUT
(H2) of a lower board to the SPI BUS IN (H1) of
the next board up on the stack. The daisy chain
linking with ribbon cables from the output port of a
lower board on the stack to the input port of the
next board above it establishes the data link bus
for the entire stack.
10
As battery cells are stacked on top of each other, great
care must be taken to prevent damage and personal
injury from the very high voltage potentials that may be
present. Do not allow short circuit connections, whether electrical or human, between a high voltage point
and the system or chassis ground at the bottom of the
stack. Be very careful and respect the potential danger
of high voltage!
DC1835A
tion(s) are then required to load the settings into
the LTC6803 devices.
SOFTWARE ADJUSTMENTS
30B
The GUI program can control up to ten boards on a
stack.
1. Select the number of boards on the stack from the
pop up window located near the command buttons
at the bottom of the screen.
2. A tab will appear on the left edge of the control
panel for each board on the stack. Clicking on any
of these tabs will transfer control commands and
data to and from the display screen to that selected
board. Each board must have a unique address
nibble selected. The address nibble must match
the settings of the address jumpers JP2-JP5 (in
hexadecimal).
3. Select whether the Operating Configuration (CDC
Comparator) and Over/Under voltage thresholds
for each board are to be the same (GLOBAL) or different for each board (CUSTOM) and set the duty
cycle and voltages accordingly. CDC = 1 is recommended for most situations. Write configura-
COLOR CODED STATUS PANEL
31B
The color-coded status panel will expand to include all
boards connected in a stack. Each small square in this
array represents an individual battery in the stack of
boards. The intent of this display is to provide a way to
see the status of all cells at a glance. The significance
of the colors used is explained in the legend on the
screen.
Any grayed box indicates that the cell’s interrupt flag
has been masked so the LTC6803 is no longer reporting this status. The cell voltage value measured for this
cell however is still accurate.
The next pages show the schematic and bill of material
for DC1835A. Consult the LTC6803-4 data sheet for
additional information.
11
A
B
C
CELL10
CELL9
CELL8
CELL7
CELL6
CELL5
CELL4
CELL3
CELL2
CELL1
CELL0
13
12
11
10
9
8
7
6
5
4
E1
LTC6803 V-
1
2
3
CELL11
14
CELL12
15
CELL VOLTAGES
53V MAX
J1
16
5
1%
R25
475
1%
R26
475
1%
R27
475
1%
R28
475
1%
R29
475
1%
R30
475
1%
R31
475
1%
R32
475
1%
R33
475
1%
R34
475
1%
R35
475
1%
R36
475
R39
33
2512
R40
33
2512
R41
33
2512
R42
33
2512
R43
33
2512
R44
33
2512
R45
33
2512
LED1
R37
33
2512
R38
33
2512
LED2
LED3
LED4
LED5
LED6
LED7
LED8
LED9
R46
33
2512
LED10
R47
33
2512
LED11
R48
33
2512
R24 3.3k
Q12
2
R11 100 1%
R23 3.3k
Q11
R10 100 1%
Q9
2
Q8
2
2
Q7
R19 3.3k
Q6
2
2
Q5
R17 3.3k
Q4
2
R16 3.3k
R4 100 1%
2
Q3
Q2
2
Q1
2
R61 0
R56 0
R13 3.3k
R1
RQJ0303PGDQALT
3
100 1%
R14 3.3k
RQJ0303PGDQALT
3
R2
100 1%
R15 3.3k
RQJ0303PGDQALT
3
R3 100 1%
RQJ0303PGDQALT
3
RQJ0303PGDQALT
3
R5
100 1%
R18 3.3k
R6 100 1%
RQJ0303PGDQALT
3
RQJ0303PGDQALT
3
R7
100 1%
R20 3.3k
RQJ0303PGDQALT
3
R8
100 1%
R21 3.3k
RQJ0303PGDQALT
3
R9
100 1%
R22 3.3k
Q10
2
RQJ0303PGDQALT
3
RQJ0303PGDQALT
3
RQJ0303PGDQALT
1
1
1
1
C10
S11
C11
C8
S9
C6
S7
C7
C4
S5
C2
S3
C3
C1
100nF
C0
S1
C1
S2
C2
100nF
C3
100nF
S4
C4
100nF
C5
100nF
C5
S6
C6
100nF
C7
100nF
S8
C8
100nF
C9
100nF
C9
S10
C10
100nF
C11
100nF
S12
C12
100nF
4
C13
100nF
0805
R49
100
1%
+54V
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
C2
S3
C3
S4
C4
S5
C5
S6
C6
S7
C7
S8
C8
S9
C9
S10
C10
S11
C11
S12
C12
V+
S2
C1
S1
C0
V-
NC
VTEMP1
VTEMP2
VREF
VREG
TOS
WDTB
GP101
GP102
A0
A1
A2
A3
SCKI
SDI
SD0
CSBI
LTC6803IG-4
U1
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
VTEMP1
VTHEMP2
VREF
VREG
TOS
WDTB
GPI01
GPI02
A0
A1
A2
A3
CK
DI
DO
CS
3
C15
V-
C17
4.7uF
10V
0805
1uF
CS
R51
1M
DO
R54
10K
1%
CK
+5V
+5V
R52
1M
2N7002
Q13
R55
110k
1206
1%
CELL12
1uF
C14
VREG
R50
1M
D1
VTEMP2
WDTB
GP101
GP102
+12V
4.3k
R53
R58
1M
1%
R57
1M
1%
+12V
25V
0805
TOS
A0
A1
A2
A3
C16 2.2uF
5
4
3
2
1
U4
1
1
1
1
0
CAP
3
JP3
3
3
JP1
1
AV-
I2
I1
SCK2
SDI2
D2
VREG
VREG
VREG
VREG
VREG
C21
1uF
100V
1210
+54V
U2
1
D1 BAT54S
3
LTM2883Y-5S
3.24M 1%
R59
MBR0540
+12V +5V
SDO2
JP4
3
6
7
8
CS2B
JP5
3
JP2
I
I
I
I
K7
L2
K1
L3
L4
L1
L5
K8
FB
VOUT
10
9
9"
0
0
0
0
SW
CAP
50V 0805
C18 220nF
2
AVCC2
1
2
3
7
6
A0
A1
A2
WP
SCL
1%
R63
4.99K
HOSTGND
EXT +5V
2
9:
:
99<
:
E2
>
100nF
D3
1
PRODUCTION
3
12
9
10
11
7
5
13
3
12
9
10
11
7
5
13
VIN
NC
GND2
SCK
CS
VCC
3
H1
EXT HOST
EEGND
EESDA
EEVCC
EESCL
MOSI
MISO
GND3
GND1
14
8
4
6
2
1
14
8
4
6
2
JON M.
04/18/14
APPROVED
DATE
07/12/11
1
LTC6803IG-4
DEMO CIRCUIT 1835A
Friday, April 18, 2014
N/A
/
/
1
ISOLATED 12-CELL BATTERY MONITOR
/0"1
2&*3$45
"#$%#&'(
) *+,-./) ???$#,-21+8
!
+,6#5-,&#$+2
7'&+8-29'-,$3
NC
GND2
SCK
CS
VCC
VIN
SPI BUS IN
1
+5V SOURCE
JP6
EEGND
EESDA
EEVCC
EESCL
MOSI
MISO
GND3
GND1
H2
SPI BUS OUT
TECHNOLOGY
R60
OPT
1
REVISION HISTORY
DESCRIPTION
CORRECT L1 VALUE
"
U3
24LC025-I/ST
5
1%
R62
4.99K
1
1
REV
MBR0540
C22
1uF
ECO
SDA
K6
A4
A2
A6
A5
A3
A1
B1
E3
SDI
DO2
SDOEB
CSB
SCK
SDO
DO1
C20
1uF
100V
1206
+54V
:"
9"
9"9
;
<("
9"=: :
9
"99
9:9":
:
9
"
:
:
TOS
A0
A1
A2
1
A3
SHDN
CNTRL
VCC
GND
GND
AV+
1210
10uH
LT3495EDDB-1
GND
11
LED12
VL7
L8
L1
VCC2
2
GND2
K5
V+
GND2
K2
B7
VCC
B2
+12V
VL
2
3
ON
3
4
GND
L6
GND2
K3
B8
VCC
C12
GND2
K4
A8
GND
B3
A7
GND
B4
R12 100 1%
GND
B5
1
1
1
GND
B6
D
5
2
2
2
2
2
1
1
1
1
1
8
VCC
GND
4
2
CELL12
&
A
B
C
D
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Qty
13
1
3
1
1
1
1
1
1
2
3
6
6
1
2
12
1
4
1
12
1
13
12
12
12
5
1
1
1
1
0
2
2
1
1
1
1
Ref - Des
C1-C12,C19
C13
C14,C15,C22
C16
C17
C18
C20
C21
D1
D2,D3
E1,E2,E3
JP1,JP2,JP3,JP4,JP5,JP6
JP1,JP3,JP4,JP5,JP6,JP7
J1
H1,H2
LED1-LED12
L1
MH1,MH2,MH3,MH4
P1
Q1-Q12
Q13
R1-R12,R49
R13-R24
R25-R36
R37-R48
R50,R51,R52,R57,R58
R53
R54
R55
R59
R60
R56,R61
R62,R63
U1
U2
U3
U4
1 of 1
Desc
CAP, 0603 100nF 10% 25V X7R
CAP, 0805 100nF 20% 100V X7R
CAP, 0603 1uF 10% 16V X7R
CAP, 0805 2.2uF 10% 25V X7R
CAP, 0805 4.7uF 10% 10V X7R
CAP, 0805 220nF 10% 50V X7R
CAP, 1206 1uF 10% 100V X7R
CAP, 1210 1uF 10% 100V X7R
DIODE, SCHOTTKY
DIODE, SCHOTTKY
TURRET
HEADER,3PIN, 2mm
SHUNT
HEADER, 1X16 3.5mm, HORIZ.
HEADER, 2X7 2mm
LED, 0603 GREEN
IND, 1210 10 uH 10 % 187 mA SMD
STANDOFF, SNAP ON
CONN. MATING 1X16 3.5 HORZ
XSTR, MOSFET, P-CHANNEL
XSTR, 2N7002 N-CHANNEL MOSFET
RES, 0603 100 OHMS 1% 1/10W
RES, 0603 3.3k OHMS 5% 1/10W
RES, 0603 475 OHMS 1% 1/10W
RES, 2512 33 OHMS 5% 1W
RES, 0603 1M OHMS 1% 1/10W
RES, 0603 4.3k OHMS 5% 1/10W
RES, 0603 10K OHMS 1% 1/10W
RES, 1206 110K OHMS 1% 1/4W
RES, 0603 3.24M OHMS 1% 1/10W
RES, 0603 OPTION
RES, 0603 0 OHM JUMPER
RES, 0603 4.99K OHMS 1% 1/10W
IC, BATTERY MONITOR
MODULE, SPI ISOLATOR
IC, 24LC025-I/ST
IC, 650mA/350mA Micropower Low Noise Boost Converter
DC1835A Rev 1
Manufacturer's Part Number
MURATA GCM188R71E104KA57D
MURATA GCM21BR72A104KA37
MURATA GCM188R71C105KA64D
MURATA GCM21BR71E225KA73
MURATA GCM21BC71A475KA73
MURATA GRM21BR71H224KA01L
MURATA GRM31CR72A105KA01L
TDK C3225X7R2A105K
DIODES INC. BAT54S-7-F
ON SEMI. MBR0540T1G
MILL MAX 2308-2-00-80-00-00-07-0
SAMTEC TMM-103-02-L-S
SAMTEC 2SN-BK-G
WEIDMULLER 1761682001
MOLEX 87831-1420
LITE-ON LTST-C190KGKT
VISHAY IMC1210ER100K
KEYSTONE_8831
WEIDMULLER 1615770000
RENASAS RQJ0303PGDQALT
ON SEMI. 2N7002K
NIC NRC06F1000TRF
NIC NRC06J332TRF
NIC NRC06F4750TRF
NIC NRC100J330TRF
NIC NRC06F1004TRF
VISHAY CRCW06034K30JNEA
NIC NRC06F1002TRF
VISHAY CRCW1206110KFKEA
VISHAY CRCW060333M24FKEA
OPTION
VISHAY CRCW06030000Z0EA
NIC NRC06F4991TRF
LINEAR TECH. LTC6803IG-4
LINEAR TECH. LTM2883Y-5S
MICROCHIP TECH. 24LC025-I/ST
LINEAR TECH. LT3495EDDB-1
`A\A
6/29/2011