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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1660 Datasheet

Digitally Controlled Fuel-Gauge Interface

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MAX1660 pdf
19-1308; Rev 1; 10/98
EVFAOLLULAOTWIOSNDKAITTAMSAHNEUEATL
Digitally Controlled
Fuel-Gauge Interface
General Description ____________________________Features
The MAX1660 digitally controlled fuel-gauge interface
executes two essential functions for rechargeable bat-
tery-pack management: fuel gauging and pack overcur-
rent protection. It accurately monitors a battery pack’s
charge and discharge current flow, and records each
using two independent, on-board Coulomb counters.
Each counter’s contents are externally accessible via a
System Management Bus (SMBus™)-compatible 2-wire
serial interface. An optional third wire interrupts the
microcontroller (µC) when the charge or discharge
counters reach a preset value, or when an overcurrent
condition (charge or discharge) occurs. In the event of
an overcurrent or short-circuit condition, the MAX1660
disconnects the load and alerts its host. The MAX1660’s
flexibility allows accurate fuel gauging for any battery
chemistry, using any desired control algorithm.
The MAX1660 operates with battery voltages from +4V
to +28V and provides two micropower shutdown
modes, increasing battery lifetime. To minimize total
parts count, the device integrates a precision 2.00V
system-reference output, a 3.3V linear-regulator output
that can supply up to 5mA to power external circuitry,
and a power-on reset output for the system µC. The
MAX1660 is available in a 16-pin QSOP package.
________________________Applications
o 1% Accuracy over a 600µA to 4A Current Range
(RSENSE = 30m)
o 5µV Input Offset Voltage (28µV max)
o SMBus 2-Wire (plus optional interrupt)
Serial Interface
o 2.00V Precision System Reference Output
o 3.3V Linear-Regulator Output Powers External
Circuitry
o Two Micropower Shutdown Modes
o Independent 32-Bit Charge and Discharge
Coulomb Counters
o Battery-Overcharge/Overdischarge Protection
o Battery Short-Circuit/Overcurrent Protection
o On-Board Power MOSFET Drivers
o 80µA Quiescent Current
o <1µA Shutdown Current
o Small 16-Pin QSOP Package
(same board area as 8-pin SO)
Ordering Information
Smart-Battery Packs
Battery-Pack Fuel Gauging
PART
TEMP. RANGE
PIN-PACKAGE
Battery-Pack Overcurrent
Protection
Industrial-Control System
Interfaces
Digital Current-Sense
Instrumentation
Analog-to-Digital
Conversion
MAX1660EEE
-40°C to +85°C
16 QSOP
Pin Configuration appears at end of data sheet.
___________________________________________________Typical Operating Circuit
PACK+
OCO BATT ODO
CS SHDN
VL VCC
RCS AGND
MAX1660 GND
REF
µC
SCL
OCI SDA
ODI INT
RST
GND
PACK-
SMBus is a trademark of Intel Corp.
*Patent pending
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1660 Datasheet

Digitally Controlled Fuel-Gauge Interface

No Preview Available !

MAX1660 pdf
Digitally Controlled
Fuel-Gauge Interface
ABSOLUTE MAXIMUM RATINGS
BATT, ODO, OCO, SHDN to GND .........................-0.3V to +30V
SCL, SDA, INT, RST to GND ....................................-0.3V to +6V
REF, ODI, OCI to GND..................................-0.3V to (VL + 0.3V)
VL to GND ................................................................-0.3V to +6V
CS to GND...................................................................-2V to +6V
AGND to GND .............................................................-1V to +1V
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C).............667mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
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
(V SHDN = VBATT = 12V, VSCL = VSDA = 3.6V, CREF = 10nF, CVL = 0.1µF, TA = 0°C to +85°C, unless otherwise noted. Typical values
are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SUPPLY AND REFERENCES
BATT Input Voltage Range
VBATT
4 28 V
BATT Supply Current
IBATT
V SHDN = 3.3V, SOFTSHDN = 0, IVL = 0
V SHDN = 3.3V, SOFTSHDN = 1, IVL = 0
V SHDN 0.4V
80 135
15 30
0.02 1
µA
VL Output Voltage
VVL
SOFTSHDN = 0, 0 IVL 5mA
SOFTSHDN = 1, 0 IVL 5mA
3.1 3.25 3.4
3.1 3.25 3.6
V
REF Output Voltage
REF Load Regulation
FUEL GAUGE
VREF
IREF = 0
0 IREF 200µA
1.96 2.00 2.04
V
10 50 µV/µA
CS to AGND Input Resistance
100 k
Discharge Coulomb-Counter
Accumulation Rate
VCS = 0
VCS = -120mV
0 2 12 counts/
49,500 50,000 50,500 sec
Charge Coulomb-Counter
Accumulation Rate
VCS = 0
VCS = 120mV
0 2 12 counts/
49,500 50,000 50,500 sec
OVERCURRENT COMPARATOR
OCI, ODI Input Offset Voltage
-7 0
7 mV
OCI, ODI Input Offset Current
(Note 1)
-1 0.01
1
µA
Propagation Delay
1 µs
ODO Sink Current
ODO Off-Leakage Current
OCO Sink Current
OCO Off-Leakage Current
INTERFACE-LOGIC LEVELS
VODO = 0.4V
VODO = 28V
VOCO = 0.4V
VOCO = 28V
1 2.5
mA
0.01 1
µA
1 2.5
mA
0.01 1
µA
Input High Voltage
Input Low Voltage
VIH SHDN, SCL, SDA
SCL, SDA
VIL SHDN
2.2 V
0.8
V
0.6
SDA Output Low Sink Current
INT Output Low Sink Current
VOL VSDA = 0.6V
VOL V INT = 0.4V
6 mA
2 mA
*Patent pending
2 _______________________________________________________________________________________


Part Number MAX1660
Description Digitally Controlled Fuel-Gauge Interface
Manufacturer Maxim
Total Page 20 Pages
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