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PDF MAX11068 Data sheet ( Hoja de datos )
| Número de pieza | MAX11068 | |
| Descripción | Smart Data-Acquisition Interface | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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.
1 page  
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12-Channel, High-Voltage Sensor, Smart
Data-Acquisition Interface
ELECTRICAL CHARACTERISTICS (continued)
(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
I2C UPPER PORT SCLU, SDAU, ALRMU (Relative to GNDU, VDDU)
MIN TYP
SDAU, ALRMU Input Voltage Low
SDAU, ALRMU Input Voltage High
SDAU, ALRMU Input Hysteresis
SDAU, SCLU Output Voltage Low
SDAU, SCLU Leakage Current
SDAU, Managed Resistance
SDAU 1-TAU Capacitance
tONE_SHOT
At sink = 3mA
VSDAU = VSCLU = 1.5V
Active edge
Managed passive state
Off passive state
tONE_SHOT (active edge pulse)
SDAU rises to 70% within active edge
time when loaded with this capacitance,
i.e., choose 100pF to guarantee 3H rising
edge
0.7 x
VVDDU
0.05
-1
0.5
30
150
120
0.1 x
VVDDU
Q1.0
1
50
1
250
280
MAX
0.3 x
VVDDU
0.4
0.4
+1
3
75
480
550
UNITS
V
V
V
V
FA
kI
kI
MI
ns
pF
ALRMU Clamp Current
ALRMU Clamp Voltage
VALRMU = VDDU + 0.15V
VALRMU = GNDU - 0.15V
250FA current pulling below GNDU
250FA current pulling above VDDU
GNDU
-0.49
Upper Port Input Capacitance
SCLU, SDAU, ALRMU
Port-to-Port Level Delay
Interface Startup
From SHDN or from POR
I2C TIMING CHARACTERISTICS
I2C Clock Frequency
fI2C
Bus Timeout Period
Bus Free Time
tTIMEOUT
tBUF
Timeout for maximum clock low/high time
Master to slave delay from a STOP to the
next START command
Bus Hold Time
tHD-STA
Master hold time after a START
command
Bus START Command Setup Time tSU-STA Repeated START setup time
Bus STOP Command Setup Time
tSU-STOP STOP condition setup time
SDA Data Hold Time
SLAVE PORT Transmit
tHD-DAT Receive
MASTER PORT Transmit
tHD-DAT Receive (Note 7)
10
500
350
1
100
500
-30
400
400
1
1
VDDU +
0.49
8
1
3
27.4
200
FA
V
V
pF
Fs
ms
kHz
ms
Fs
Fs
Fs
ns
ns
5
5 Page 
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12-Channel, High-Voltage Sensor, Smart
Data-Acquisition Interface
HV
6V
DCIN
C12
9V
C11
9V
C3 TO C10 MATCH
OTHER INPUTS
C2
C1
C0
AGND
9V
9V
4V
80V 80V
80V
MAX11068
ESD DIODES
4V 80V 4V 4V
VDDU
CP+
ALRMU/SDAU/SCLU
GNDU
CP-
VAA
REF/THRM
SHDN
VDDL
AIN0/1
GPIO0/1/2
ALRML/SDAL/SCLL
GNDL
NOTE: ALL DIODES ARE RATED FOR ESD CLAMPING CONDITIONS. THEY ARE NOT INTENDED TO
ACCURATELY CLAMP DC VOLTAGE. ALL DIODES SHOWN HAVE A PARASITIC PN DIODE FROM
THEIR CATHODE TO AGND THAT IS OMITTED FOR CLARITY. THIS PARASITIC DIODE HAS ITS
ANODE AT AGND.
Figure 3. MAX11068 ESD Diode Diagram
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX11068.PDF ] | |
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