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PDF LTC6802-2 Data sheet ( Hoja de datos )
| Número de pieza | LTC6802-2 | |
| Descripción | Multicell Addressable Battery Stack Monitor | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
n Measures Up to 12 Li-Ion Cells in Series (60V Max)
n Stackable Architecture Enables Monitoring High
Voltage Battery Stacks
n Individually Addressable with 4-Bit Address
n 0.25% Maximum Total Measurement Error
n 13ms to Measure All Cells in a System
n Cell Balancing:
On-Chip Passive Cell Balancing Switches
Provision for Off-Chip Passive Balancing
n Two Thermistor Inputs Plus Onboard
Temperature Sensor
n 1MHz Serial Interface with Packet Error Checking
n High EMI Immunity
n Delta-Sigma Converter With Built-In Noise Filter
n Open-Wire Connection Fault Detection
n Low Power Modes
n 44-Lead SSOP Package
Applications
n Electric and Hybrid Electric Vehicles
n High Power Portable Equipment
n Backup Battery Systems
n High Voltage Data Acquisition Systems
LTC6802-2
Multicell Addressable
Battery Stack Monitor
Description
The LTC®6802-2 is a complete battery monitoring IC that
includes a 12-bit ADC, a precision voltage reference, a
high voltage input multiplexer and a serial interface. Each
LTC6802-2 can measure 12 series connected battery cells,
with a total input voltage up to 60V. The voltage on all 12
input channels can be measured within 13ms.
Many LTC6802-2 devices can be stacked to measure the
voltage of each cell in a long battery string. Each LTC6802-2
has an individually addressable serial interface, allowing
up to 16 LTC6802-2 devices to interface to one control
processor and operate simultaneously.
To minimize power, the LTC6802-2 offers a measure mode
to monitor each cell for overvoltage and undervoltage
conditions. A standby mode is also provided to reduce
supply current to 50µA.
Each cell input has an associated MOSFET switch that can
discharge any overcharged cell.
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The related LTC6802-1 offers a serial interface that allows
the serial ports of multiple LTC6802-1 devices to be daisy
chained without opto-couplers or isolators.
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.
Typical Application
NEXT 12-CELL
PACK ABOVE
+
12-CELL
BATTERY
STRING
+
+
NEXT 12-CELL
PACK BELOW
V+ LTC6802-2
DIE TEMP
REGISTERS
AND
CONTROL
MUX
SERIAL DATA
4-BIT
ADDRESS
V–
100k NTC
12-BIT
∆∑ ADC
EXTERNAL
TEMP
VOLTAGE
REFERENCE
68022 TA01a
100k
Measurement Error Over
Extended Temperature
0.30
0.25
7 REPRESENTATIVE UNITS
VS = 43.2V
0.20 CELL VOLTAGE 3.6V
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
68022 TA01b
68022fa
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Typical Performance Characteristics
Cell Measurement Total
Unadjusted Error
10
8
TA = –40°C
TA = 25°C
6
TA = 85°C
TA = 125°C
4
2
0
–2
–4
–6
–8
–10
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
CELL VOLTAGE (V)
68022 G09
Cell Measurement Total
Unadjusted Error vs Input
Resistance
10
0
–10
–20
–30
–40 RS = 1k
–50
RS = 2k
RS = 5k
–60 RS = 10k
–70
RS IN SERIES WITH Cn AND Cn – 1
NO EXTERNAL CAPACITANCE ON
–80 Cn AND Cn – 1
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
CELL VOLTAGE (V)
68022 G10
Measurement Gain Error
Hysteresis
20
18
TA = –45°C TO 25°C
16
14
12
10
8
6
4
2
0
–250–200–150–100 –50 0 50 100 150 200
CHANGE IN GAIN ERROR (ppm)
68022 G21
Cell Measurement Common Mode
Rejection
0 VCM(IN) = 5VP-P
–10
72dB REJECTION
CORRESPONDS TO
LESS THAN 1 BIT
–20 AT ADC OUTPUT
–30
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–40
–50
–60
–70
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
68022 G15
LTC6802-2
Measurement Gain Error
Hysteresis
25 TA = 85°C TO 25°C
20
15
10
5
0
–250–200–150–100 –50 0 50 100 150 200
CHANGE IN GAIN ERROR (ppm)
68022 G20
ADC Normal Mode Rejection vs
Frequency
0
–10
–20
–30
–40
–50
–60
–70
10
100 1k 10k
FREQUENCY (Hz)
100k
68022 G14
ADC INL
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
1
23
INPUT (V)
45
68022 G05
ADC DNL
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
1
23
INPUT (V)
45
68022 G06
Cell Input Bias Current in Standby
50
40
30 C1
20
C12
10
0
–10
–40 –20
C2 TO C11
0 20 40 60 80 100 120
TEMPERATURE (°C)
68022 G03
68022fa
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Operation
LTC6802-2
LTC6802-2
V+ IC #2 CSBI
+
C12 SDO
S12 SDI
+
C11 SCKI
S11 A3
+
C10 A2
S10 A1
+
C9 A0
S9 GPIO2
+
C8 GPIO1
S8 WDTB
+
C7 MMB
S7 TOS
+
C6 VREG
S6 VREF
+ C5 VTEMP2
S5 VTEMP1
+
C4 NC
S4 V–
+
C3 S1
S3 C1
+ C2 S2
+
IC #3 TO IC #7
V2– V1–
OE2 OE1
ADDRESS 1
V2– V1–
V2+ V1+
DIGITAL
ISOLATOR
3V
BATTERY
POSITIVE
350V
+
+
+
+
+
+
+
+
+
+
+
+
LTC6802-2
V+ IC #8 CSBI
C12 SDO
S12 SDI
C11 SCKI
S11 A3
C10 A2
S10 A1
C9 A0
S9 GPIO2
C8 GPIO1
S8 WDTB
C7 MMB
S7 TOS
C6 VREG
S6 VREF
C5 VTEMP2
S5 VTEMP1
C4 NC
S4 V–
C3 S1
S3 C1
C2 S2
V2– V1–
OE2 OE1
ADDRESS 15
V2– V1–
V2+ V1+
DIGITAL
ISOLATOR
3V
LTC6802-2
V+ IC #1 CSBI
+
C12 SDO
S12 SDI
+
C11 SCKI
S11 A3
+
C10 A2
S10 A1
+
C9 A0
S9 GPIO2
+
C8 GPIO1
S8 WDTB
+
C7 MMB
S7 TOS
+
C6 VREG
S6 VREF
+ C5 VTEMP2
S5 VTEMP1
+
C4 NC
S4 V–
+
C3 S1
S3 C1
+ C2 S2
V2– V1–
OE2 OE1
ADDRESS 0
V2– V1–
V2+ V1+
DIGITAL
ISOLATOR
3V
3V
MISO
CS
MOSI
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CLK
MPU
MODULE
IO
+
68022 F01
Figure 1. 96-Cell Battery Stack, Isolated Interface. In this Diagram the Battery Negative is Isolated from Module Ground.
Opto-Couplers or Digital Isolators Allow Each IC to be Addressed Individually. This is a Simplified Schematic Showing
the Basic Multi-IC Architecture
between C2 and C4 after several cycles of measuring cells
B3 and B4. Thus the measurements for B3 and B4 may
indicate a valid cell voltage when in fact the exact state of
B3 and B4 is unknown.
To reliably detect an open connection, the command
STOWAD is provided. With this command, two 100µA
current sources are connected to the ADC inputs and
turned on during all cell conversions. Referring again to
Figure 3, with the STOWAD command, the C3 pin will be
pulled down by the 100µA current source during the B3
cell measurement AND during the B4 cell measurement.
This will tend to decrease the B3 measurement result and
increase the B4 measurement result relative to the normal
STCVAD command. The biggest change is observed in the
68022fa
11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC6802-2.PDF ] | |
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