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PDF MAX1781 Data sheet ( Hoja de datos )
| Número de pieza | MAX1781 | |
| Descripción | Advanced Smart Battery-Pack Controller | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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MAX1781 Advanced Smart Battery-Pack Controller
__________General Description ____________________Features
The MAX1781 smart battery-pack controller integrates
a user-programmable microcontroller core, a Coulomb-
counting fuel gauge, a multi-channel data-acquisition
unit, and an SMBus v1.1 compliant master/slave
SMBus interface. The 8-bit, RISC microcontroller core
has an integrated 12k bytes of user programmable
EEPROM, which provides battery-pack designers with
complete flexibility in developing fuel gauging and
control algorithms. The MAX1781 is equipped with
full ICE (in-circuit emulator) capability for efficient
firmware development and debugging.
The 16-bit data-acquisition unit measures individual
cell voltages, cell stack voltage, chip internal/external
temperature, and two general purpose analog inputs.
Individual cell voltage measurements with 0.5%
accuracy and over-current protection allow the
MAX1781 to eliminate a separate 1st level protection
IC. Adjustable over-current thresholds and delay
timers provide a flexible solution.
The integrating fuel gauge module provides a typical
input offset of less than 1uV, and gain accuracy of
better than 1% with no trimming required during pack
manufacture. The MAX1781 has a wide 4V to 28V
operating voltage range. The IC is available in a 7mm
x 7mm 48-TQFN package with a maximum thickness
of 0.8mm.
________________Applications
¨ Accurate Fuel Gauge Uses V to F Method
· <1µV Input Offset Voltage
· <1% Gain Accuracy
· No Calibration Required
¨ 8-bit RISC Microcontroller Core
¨ 12k Bytes of Program/Data EEPROM
¨ 64 Bytes of Byte Writeable EEPROM
¨ 264 Bytes of RAM
¨ Watchdog Timer
¨ ICE for Firmware Debugging
¨ Integrated Development Environment (IDE)
· C Compiler
· Inline Assembler
¨ Eliminates Separate Primary-Protection IC
· Individual Cell Voltage Measurements with
0.5% accuracy
· Built-In Protection MOSFET Gate Drivers
· 8% Accurate Overcurrent Protection
· Programmable Over-Current Delay Timers
¨ SMBus v1.1-Compliant, with Master Capability
¨ Typical Operating Current <120µA
¨ Typical Shutdown Current <10nA
¨ Integrated 32kHz Oscillator: No Crystal
¨ Fully Integrated LDO (VIN = 4V to 28V)
___________Pin Configuration
Notebook Battery Packs
Proprietary Battery Packs
Data-Acquisition Systems
Remote Data Logging
________________Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1781ETM
-40°C to +85°C
48 TQFN
HV0 1
HV1 2
HV2 3
HV3 4
HV4 5
HV5 6
HV6 7
HV7 8
CHG 9
PCKP 10
AGND 11
VAA 12
MAX1781
*EXPOSED PADDLE
36 NC7
35 NC6
34 NC5
33 NC4
32 NC3
31 NC2
30 NC1
29 VPP0
28 ICLK
27 MCLR
26 AIN1
25 AIN0
_______________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com
1 page  
Version 1.21, 2-19-07 MAX1781 Advanced Smart Battery-Pack Controller
HV Register ................................................................................................................................................................. 61
Digital Peripherals ................................................................................................. 61
Port A ................................................................................................................................................ 61
Port A interrupts........................................................................................................................................................... 62
Port A Registers ........................................................................................................................................................... 62
RTCC Timer and Watchdog............................................................................................................... 63
Watchdog Timer Register ............................................................................................................................................. 64
SMBus Interface ................................................................................................................................ 64
Introduction.................................................................................................................................................................. 64
Features........................................................................................................................................................................ 65
Description................................................................................................................................................................... 65
Transmit and Receive Buffers....................................................................................................................................... 66
Slave Sequence Control ................................................................................................................................................ 67
Master Sequence Control.............................................................................................................................................. 67
Packet Error Code (PEC).............................................................................................................................................. 68
Timeouts and Clock Stretching ..................................................................................................................................... 68
Glitch Filter.................................................................................................................................................................. 69
BAUD Rate Setting ...................................................................................................................................................... 69
SMBus Registers.......................................................................................................................................................... 69
Access and Security ........................................................................................................................... 73
Locking/Unlocking the MAX1781................................................................................................................................ 73
Service/Normal Mode................................................................................................................................................... 73
Manufacturer Access Commands.................................................................................................................................. 74
Parallel Programming Mode ......................................................................................................................................... 75
Access and Security Registers....................................................................................................................................... 77
Design and Applications Information ............................................................ 78
ESD and Short Protection on the Battery Pins .................................................................................... 78
Setting Over-Discharge Current and Short-Circuit Current Thresholds............................................... 79
Improving Fuel Gauge Measurement Accuracy.................................................................................. 80
Startup with Under-Voltage Cells....................................................................................................... 80
Chip Information .................................................................................................... 81
Package Information ............................................................................................. 96
Table Of Figures
Figure 1. SMBus Timing Diagram...................................................................................................................................... 12
Figure 2. Max1781 Typical Application Circuit.................................................................................................................. 20
Figure 3. MAX1781 Harvard Architecture.......................................................................................................................... 21
Figure 4. MAX1781 System Block Diagram ...................................................................................................................... 22
Figure 5. MAX1781 Instruction Pipeline ............................................................................................................................ 23
Figure 6. Program Memory Map........................................................................................................................................ 26
Figure 7. MAX1781 Interrupt Tree..................................................................................................................................... 32
Figure 8. Dual Linear Regulators....................................................................................................................................... 41
Figure 9. Supply Voltage Sequencing ................................................................................................................................. 42
Figure 10. Fuel-Gauge Block Diagram ............................................................................................................................. 44
Figure 11. Data-Acquisition Unit Block Diagram............................................................................................................... 50
Figure 12. ADCSTCONV and ADCI Timing ....................................................................................................................... 52
Figure 13. MAX1781 Thermistor Circuit........................................................................................................................... 56
Figure 14. Overcurrent Comparator Functional Diagram .................................................................................................. 57
Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600_______________ Page 5 of 96
5 Page 
Version 1.21, 2-19-07 MAX1781 Advanced Smart Battery-Pack Controller
(VBATT = VPCKP = 12V, GND = AGND = CSN = 0, VDD = VAA, CVAA = 1µF, instruction oscillator is off, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25ºC.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ODI, SCI Input Bias Current
2 nA
ODI, SCI Comparator Propagation
Delay in Fault-Trip Direction
20mV input overdrive
2 µs
ODI Delay
ODSCDLY=0x83
2.869 2.982 3.102 ms
SCI Delay
ODSCDLY=0x83
418 488 560 μs
SCI Service-Mode Entry Current
-3 -2 mA
CHARGE AND DISCHARGE FET DRIVERS
DIS Source Current
CHG Source Current
CHG, DIS Output Sink Current
CHG, DIS Pull-Up Resistance
DIS Output Voltage High
VBATT - VDIS
CHG Output Voltage High
VPCKP - VCHG
DIS Clamp Voltage (VCLAMP)
VBATT - VDIS
CHG Clamp Voltage (VCLAMP)
VPCKP - VCHG
DIS, CHG Voltage Output Low
VBATT = 20V, VBATT - VDIS = 3V
VPCKP = 20V, VPCKP - VCHG = 3V
VPCKP = VBATT = 20V,
VDIS = VBATT - VCLAMP + 2V,
VCHG = VPCKP - VCLAMP + 2V,
VBATT = 20V, VBATT - VDIS = 0.5V,
VPCKP = 20V, VPCKP - VCHG = 0.5V
VBATT = 20V, no load
VPCKP = 20V, no load
No load, VBATT = VPCKP = 4V
1.6 5
1.6 5
0.3 1.2
mA
mA
mA
4 MW
0 0.2
V
0 0.2
V
5 8.2 11
V
5 8.2
1.2
11
V
V
INSTRUCTION OSCILLATOR
Frequency
2.7V < VDD < 3.6V
5.25 6 6.75 MHz
INTERNAL TIMER OSCILLATOR
32.768kHz Oscillator Accuracy
12-cycle average
-1.5 1.5 %
PORT A LOGIC INPUTS/OUTPUTS—PA[7:0]
Input Voltage Low
Input Voltage High
High-Impedance Leakage Current
2.7V < VDD < 3.6V
2.7V < VDD < 3.6V
I/O pins programmed to Hi-Z
2.4
0.01
0.8
1
V
V
µA
Output Voltage Low
Output Voltage High
ISINK = 2mA
ISOURCE = 2mA
VDD -
0.2
0.25 V
V
MCLR RESET PIN
MCLR Output Voltage Low
MCLR Output Voltage High
ISINK = 1mA, and VBATT = VDD = 2.5V
ISOURCE = 0, VBATT = VDD = 3.4V
VDD -
0.2
0.2 V
V
MCLR Pullup Resistance
Internally connected from MCLR to VAA
MCLR Input High Voltage
MCLR Input Low Voltage
MCLR Input Hysteresis
HIGH-VOLTAGE OPEN-DRAIN OUTPUTS (HV0–HV7)
10
2.4
20
300
40
1
kW
V
V
mV
Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600_______________ Page 11 of 96
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet MAX1781.PDF ] | |
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