LTC6804-2_15 Datasheet, PDF (1/74 Pages) Linear Technology – Multicell Battery Monitors

Features
n _{Measures Up to 12 Battery Cells in Series}
n _{Stackable Architecture Supports 100s of Cells}
n _{Built-In isoSPI™ Interface:}
1Mbps Isolated Serial Communications
Uses a Single Twisted Pair, Up to 100 Meters
Low EMI Susceptibility and Emissions
n _{1.2mV Maximum Total Measurement Error}
n _{290µs to Measure All Cells in a System}
n _{Synchronized Voltage and Current Measurement}
n _{16-Bit Delta-Sigma ADC with Frequency}
Programmable 3rd Order Noise Filter
n _{Engineered for ISO26262 Compliant Systems}
n _{Passive Cell Balancing with Programmable Timer}
n _{5 General Purpose Digital I/O or Analog Inputs:}
Temperature or other Sensor Inputs
Configurable as an I²C or SPI Master
n _{4μA Sleep Mode Supply Current}
n _{48-Lead SSOP Package}
Applications
n _{Electric and Hybrid Electric Vehicles}
n _{Backup Battery Systems}
n _{Grid Energy Storage}
n _{High Power Portable Equipment}
LTC6804-1/LTC6804-2
Multicell Battery Monitors
Description
The LTC^®6804 is a 3rd generation multicell battery stack
monitor that measures up to 12 series connected battery
cells with a total measurement error of less than 1.2mV. The
cell measurement range of 0V to 5V makes the LTC6804
suitable for most battery chemistries. All 12 cell voltages
can be captured in 290µs, and lower data acquisition rates
can be selected for high noise reduction.
Multiple LTC6804 devices can be connected in series,
permitting simultaneous cell monitoring of long, high volt-
age battery strings. Each LTC6804 has an isoSPI interface
for high speed, RF-immune, local area communications.
Using the LTC6804-1, multiple devices are connected in
a daisy-chain with one host processor connection for all
devices. Using the LTC6804-2, multiple devices are con-
nected in parallel to the host processor, with each device
individually addressed.
Additional features include passive balancing for each cell,
an onboard 5V regulator, and 5 general purpose I/O lines.
In sleep mode, current consumption is reduced to 4µA.
The LTC6804 can be powered directly from the battery,
or from an isolated supply.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered and isoSPI is a
trademark of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Typical Application
+
12S1P
+
+
+
+
+
IPB
LTC6804-1
IMB
IPLAP
IMA
•
IPB
•
LTC6804-1
IMB
IPA
IMA
•
IPB
•
LTC6804-1
IMB
IPA
IMA
MPU
SPI
IP
LTC6820
IM
680412 TA01a
Total Measurement Error
vs Temperature of 5 Typical Units
2.0
CELL VOLTAGE = 3.3V
1.5 5 TYPICAL UNITS
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
680412 TA01b
For more information www.linear.com/LTC6804-1
680412fb
1