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Linear Technology LTC6801 Demo Manual

Multicell li-ion battery monitor
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Description
Demonstration circuit 1469B is a multicell Li-Ion battery
monitor featuring the
LTC
®
detects individual over- and undervoltage conditions
on up to 12 series connected lithium-ion cells and two
temperature limits using suitable sensors. Pin-strapping
establishes the cell count to monitor, the threshold for
OV, threshold for UV, alarm hysteresis, and measurement
interval. A square wave is used to excite the alarm circuit,
and a returned signal duplicates this if no alarms are pres-
ent, but returns a static signal when a fault condition is
present. The circuit also provides a means of cascading
performance summary
SYMBOL
PARAMETER
V
Total Input Supply Range
IN
I
Supply Current, Idle
QS
I
Supply Current, Measuring
M
N
Number of Cells Monitored
V
Individual Cell Undervoltage Threshold
UV
V
Individual Cell Overvoltage Threshold
OV
HYS
Individual Cell Undervoltage Alarm Hysteresis
UV
HYS
Individual Cell Overvoltage Alarm Hysteresis
OV
T
Measurement Cycle Time
CYCLE
VERR
Measurement Error
TEMP
Operational Temperature Range
OP
TEMP
Temperature Alarm Limits (Nominal)
LIM
F
Alarm Enable Input Frequency
IN
6801. This circuit autonomously
Specifications are at T
CONDITIONS
Total Potential of Series-Connected Cells
Current into V
15ms (Continuous)
130ms
500ms
9 Strappable Choices
9 Strappable Choices
9 Strappable Choices
3 Strappable Choices
3 Strappable Choices
Set by Onboard Thermistors
Digital Square Wave
DEMO MANUAL DC1469B
Multicell Li-Ion Battery
numerous monitors together so that very large series con-
nected arrays of cells can be monitored simultaneously.
Additional support features are provided on the demo
circuit, including a digital excitation source and an alarm
indicator LED, so that standalone evaluations can be per-
formed. Jumpers are provided to provide for local signal
loop back and to activate the desired support circuits.
The following table indicates the performance and control
ranges of the LTC6801.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1469B
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
= 25°C
A
+
Pin When Idle
LTC6801
Monitor
MIN
TYP
MAX
UNITS
10
60
30
700
200
90
4
12
0.77
2.88
3.74
4.51
0
500
0
200
15
500
–1
1
–40
25
85
–20
60
1
10
50
dc1469bf
V
µA
µA
µA
µA
Cells
V
V
mV
mV
ms
%
°C
°C
kHz
1

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Summary of Contents for Linear Technology LTC6801

  • Page 1 The circuit also provides a means of cascading Design files for this circuit board are available at http://www.linear.com/demo/DC1469B L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. performance summary Specifications are at T = 25°C...

  • Page 2: Operating Principles

    EIN signal propagates to the SOUT of the power (i.e. in the idle condition). LTC6801 and can drive the SIN port of an LTC6801 lower An LED indicator circuit is also provided to allow visual in the cascade. For a single LTC6801, the EOUT signals are indication of the alarm condition.

  • Page 3: Quick Start Procedure

    Demonstration circuit 1469B is easy to set up to evalu- 3. Turn on the power at the cell simulator, and adjust to ate the performance of the LTC6801. Refer to Figure 1 about 3V per cell (i.e. 36V for 12 cells).
  • Page 4 DEMO MANUAL DC1469B Quick start proceDure Figure 1. Proper Evaluation Equipment Setup dc1469bf...

  • Page 5: Schematic Diagram

    Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
  • Page 6 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.