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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX11068 Datasheet

Smart Data-Acquisition Interface

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19-5192; Rev 0; 6/10
EVAALVUAAILTAIOBNLEKIT
12-Channel, High-Voltage Sensor, Smart
Data-Acquisition Interface
General Description
The MAX11068 is a programmable, highly integrated,
high-voltage, 12-channel, battery-monitoring smart data-
acquisition interface. It is optimized for use with batter-
ies used in automotive systems, hybrid electric battery
packs, electric cars, and any system that stacks long
series strings of secondary metal batteries. This highly
integrated battery sensor incorporates a simple state
machine and a high-speed I2C bus for SMBusK-laddered
serial communication.
The MAX11068 analog front-end combines a 12-channel
voltage measurement data-acquisition system with a high-
voltage switch bank input. All measurements are done
differentially across each cell. The full-scale measurement
range is from 0 to 5.0V, with full stated accuracy guaran-
teed from 0.5V to 4.7V. The input mux/switch bank allows
for differential measurement of each cell in a series stack.
A high-speed, 12-bit successive approximation (SAR) A/D
converter is used to digitize the cell voltages. All 12 cells
can be measured in less than 107Fs. The MAX11068 uses
a two-scan approach for collecting cell measurements
and correcting them for errors. The first phase of the scan
is the acquisition phase where the voltages of all 12 cells
are acquired. The second phase is the error-cancellation
phase where the ADC input is chopped to remove errors.
This two-phase approach yields excellent accuracy over
temperature and in the face of extreme noise in the sys-
tem. The MAX11068 incorporates an internal oscillator that
generates a 6.0MHz system clock with Q3.0% accuracy.
The MAX11068 consumes less than 2.0mA from the power
supply while in data-acquisition modes. This current is
reduced to 75FA in standby mode and less than 1FA in
shutdown mode. The device is packaged in a 38-pin,
9.7mm x 4.4mm x 1.0mm TSSOP package that is lead free
and RoHS compliant and is designed to operate over the
AEC-Q100 Grade 2, -40NC to +105NC temperature range.
Applications
High-Voltage, Multicell Series-Stacked-Battery
Systems
Electric and Hybrid Electric Vehicle (HEV)
Battery Packs
Electric Bikes
High-Power Battery Backup Systems
SuperCap Backup Systems
Power Tools
SMBus is a trademark of Intel Corp.
Features
S 12-Cell Battery Voltage Measurement with
Temperature Monitoring
Up to 12 Lithium-Ion (Li+), NiMH, or Super-Cap
Cells
Two Auxiliary Analog Inputs for Temperature
Measurement
S High-Accuracy I/Os
Excellent ±0.25% Voltage-Measurement
Accuracy
5mV Offset Voltage
S Integrated 12-Channel Data-Acquisition System
12-Channel High-Voltage Mux to ADC
Differential Cell-Voltage Measurement
12-Bit Precision, High-Speed SAR ADC
12 Cell Voltages Measured Within 107µs
S Battery-Fault Detection
Overvoltage and Undervoltage Digital Threshold
Detection
Cell Sense Line Open-Circuit Detection
High/Low Temperature Digital Threshold
Detection
S 12 Integrated Cell-Equalization Switches
Support Up to 200mA
S Integrated 6V to 70V Input Linear Regulator
S Integrated 25ppm/NC, 2.5V Precision Reference
S Integrated Level-Shifted, I2C-Compliant SMBus
Ladder Interface
Supports Multiple Devices, Up to 31 SMBus-
Ladder-Connected ICs
Communications Protocol with Autoaddressing
Fault-Tolerant Hardware Handshake and Data
CRC Checking
S Three General-Purpose Digital I/O Lines
S Ultra-Low Power Dissipation
Standby Mode Quiescent Current Drain 75µA
Shutdown Mode Leakage Current 1µA
S Operating Temperature Range from -40NC to
+105NC (AEC-Q100 Grade 2)
S 38-Pin, Lead-Free/RoHS-Compliant TSSOP
Package (9.7mm x 4.4mm)
Ordering Information
PART
MAX11068GUU+
MAX11068GUU/V+
TEMP RANGE PIN-PACKAGE
-40NC to +105NC 38 TSSOP
-40NC to +105NC 38 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
/V Denotes an automotive qualified part.
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX11068 Datasheet

Smart Data-Acquisition Interface

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MAX11068 pdf
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12-Channel, High-Voltage Sensor, Smart
Data-Acquisition Interface
ABSOLUTE MAXIMUM RATINGS
HV, VDDU, GNDU, DCIN to AGND.......................-0.3V to +80V
HV to C12.................................................................-0.3V to +6V
C1–C12 to AGND.......................................-0.3V to (VHV + 0.3V)
C(N+1) to C(N).....................................................-0.3V to +9.0V
C0 to AGND..........................................................-0.3V to +4.0V
SHDN to AGND.....................................................-0.3V to +60V
VAA to AGND........................................................-0.3V to +4.0V
VDDL to GNDL......................................................-0.3V to +4.0V
VDDU to GNDU....................................................-0.3V to +6.0V
GNDU to GNDL.....................................................-0.3V to +80V
AGND to GNDL.....................................................-0.3V to +0.3V
AUXIN1, AUXIN2, THRM to AGND.......................-0.3V to +6.0V
REF to AGND............................................ -0.3V to (VAA + 0.3V)
SCLL, SDAL, ALRML to GNDL................ -0.3V to (VDDL + 0.3V)
SCLU, SDAU, ALRMU to GNDU..............-0.3V to (VDDU + 0.3V)
CP+ to AGND......................... (GNDU - 1.0V) to (VDDU + 1.0V)
CP- to AGND.......................................... -0.3V to (GNDU + 0.3V)
GPIO0, GPIO1, GPIO2............................ -0.3V to (VDDL + 0.3V)
ESD Rating (HBM, Note 1)..................................................Q2kV
C0–C12, AUXIN1, AUXIN2, REF, VAA, VDDU, GNDU,
VDDL, GNDL, DCIN, SHDN, CP+, CP-, HV, SCLU, SDAU,
ALRMU, SCLL, SDAL, ALRML, GPIO0, GPIO1, GPIO2
Maximum Continuous Current into Any Pin........................20mA
ESD Diode Maximum Average
Power Dissipation for Hot Plug (Note 2).... ..................14.4/√τ W
Continuous Power: Multilayer Board..........................1269.8mW
Continuous Power: Single-Layer Board
(derating 15.9mW/NC above +70NC).......................1095.9mW
Operating Temperature Range........................ .-40NC to +105NC
Storage Temperature Range............................ -55NC to +150NC
Junction Temperature (continuous).................................+150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Note 1: Human Body Model to Specification MIL-STD-883 Method 3015.7.
Note 2: Maximum average power dissipation for time period τ. Peak current must never exceed 2A. τ is one time constant (in µs) of
hot-plug current waveform through a given diode. For example, if τ is 330µs, the maximum average diode power dissipation
is 0.793W. Actual average power dissipation must be calculated from current waveform for the application circuit.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(TA = TMIN to TMAX, unless otherwise noted. VGNDU = VDCIN = 18V to +60V, typical values are at TA = +25NC, unless otherwise
specified from -40NC to +105NC per the application circuit in Figure 4.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
C0–C12 INPUTS
Differential Cell Input-Voltage
Range
VCELLXIN
Any 2 inputs
CN+1 to CN for C12–C0 (Note 2)
0.5
4.7 V
Input C1 referred to AGND
0.7 7.0
Cell Input Common-Mode Voltage
Range (Note 5)
VCXIN
Inputs C2 through C[TOP] referred to
AGND
C[TOP] referred to AGND
C0 referred to AGND
0.7
-0.05
GNDU
+0.05
V
Input-Leakage Current
ADC Resolution
Channel- Conversion Time
ICXIN
ADCBITS
tS
ADC off; CN to CN+1 = 5V
ADC ON; CN to CN+1 = 3V
LSB size is +1.22mV
Highest enabled input
Enabled inputs except highest
-1.0 +1.0
Q10.0
FA
12 Bits
11.34
7.66
Fs/
Channel
TA = +25NC (Note 4); VCELL = 3.0V
-5
+5
Channel Accuracy
-10NC < TA < +50NC; VCELL = 3.0V
(Note 3)
-40NC < TA < +85NC; VCELL = 3.0V
(Note 3)
-10
-15
+10
mV
+15
-40NC < TA < +105NC; VCELL = 3.0V
-20
+20
2


Part Number MAX11068
Description Smart Data-Acquisition Interface
Maker Maxim Integrated Products
Total Page 30 Pages
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