MAX1660 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Digitally Controlled Fuel-Gauge Interface

19-1308; Rev 1; 10/98
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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
(R_SENSE = 30mΩ)
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
V_CC
R_CS
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
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