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What is MAX1781?

This electronic component, produced by the manufacturer "Maxim Integrated", performs the same function as "Advanced Smart Battery-Pack Controller".


MAX1781 Datasheet PDF - Maxim Integrated

Part Number MAX1781
Description Advanced Smart Battery-Pack Controller
Manufacturers Maxim Integrated 
Logo Maxim Integrated Logo 


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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

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MAX1781 equivalent
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


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