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PDF MAX1660EEE Data sheet ( Hoja de datos )
| Número de pieza | MAX1660EEE | |
| Descripción | Digitally Controlled Fuel-Gauge Interface | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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 = 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 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.
1 page  
Digitally Controlled
Fuel-Gauge Interface
TIMING CHARACTERISTICS
(TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
SCL Serial-Clock High Period
SCL Serial-Clock Low Period
Start-Condition Setup Time
Start-Condition Hold Time
tHIGH
tLOW
tSU:STA
tHD:STA
SDA Valid to SCL Rising-Edge Setup
Time, Slave Clocking in Data
tSU:DAT
SCL Falling Edge to SDA Transition
tHD:DAT
SCL Falling Edge to SDA Valid, Master
Clocking in Data
tDV
CONDITIONS
MIN TYP MAX UNITS
4 µs
4.7 µs
4.7 µs
4 µs
800 ns
0 ns
1 µs
Note 1: OCI and ODI are MOSFET inputs. Minimum and maximum limits are for production screening only. Actual performance is
indicated in typical value.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
START
CONDITION
MOST SIGNIFICANT ADDRESS BIT
(A6) CLOCKED INTO SLAVE
A5 CLOCKED
INTO SLAVE
A4 CLOCKED
INTO SLAVE
A3 CLOCKED
INTO SLAVE
SCL
tHD:STA
SDA
tLOW
tSU:STA
tSU:DAT
Figure 1. SMBus Serial-Interface Timing—Address
tHD:DAT
RW BIT
CLOCKED
INTO SLAVE
ACKNOWLEDGE
BIT CLOCKED
INTO MASTER
tSU:DAT
tHD:DAT
MOST SIGNIFICANT BIT
OF DATA CLOCKED
INTO MASTER
tHIGH
SCL
SDA SLAVE PULLING
SDA LOW
tDV tDV
Figure 2. SMBus Serial-Interface Timing—Acknowledge
*Patent pending
_______________________________________________________________________________________ 5
5 Page 
Digitally Controlled
Fuel-Gauge Interface
Overcurrent Detection
The MAX1660’s precision analog interface continuously
monitors the input current to detect an overcurrent con-
dition. Figure 7 shows the functional diagram of the
overcurrent comparator section.
An overcurrent condition occurs whenever the voltage
on CS exceeds the voltage on OCI (for charging cur-
rents), or when ODI falls below ground (for discharging
currents). When an overcurrent condition occurs, the
overcurrent comparators generate an interrupt (INT
goes low) and set the OD (discharging) or OC (charg-
ing) latch, which remains set until either the configura-
tion word’s CLRINT bit is set, the MAX1660 enters soft-
shutdown mode, or the MAX1660 initiates a power-on
reset. The host defines any action taken upon receipt of
this interrupt. A logic block follows the latch, which sets
the gate-driver output’s appropriate state, as defined in
Table 4, and drives the N-channel MOSFET open-drain
gate drivers.
Although the host has complete control over the
MAX1660’s response to an overcurrent condition, take
care to ensure adequate overcurrent protection. In gen-
eral, the configuration word’s OCLO and ODLO bits
should always remain cleared. This ensures that either
the MAX1660 will be in overcurrent auto-detect mode
(the power-on-reset state), or the external FETs are
forced off (the load is disconnected). Regardless of the
OCLO and ODLO bit settings, the MAX1660 interrupts
the host (INT goes low) if the current flow exceeds the
overcurrent threshold.
When OCHI = OCLO = 1 or ODHI = ODLO = 1, the cor-
responding overcurrent comparator operates in free-
running mode, driving OCO and ODO directly. When
the current exceeds the overcurrent threshold, the
appropriate MOSFET turns off, and when the current
is below the overcurrent threshold, it turns on. Forcing
the MOSFET off prevents current from flowing, which in
turn decreases the current flow to below the over-
current threshold. A persistent overcurrent condition,
therefore, produces a pulsed output as the current flow
repeatedly crosses the overcurrent threshold. In free-
running mode, INT pulls low when the first overcurrent
condition occurs, and stays low until the interrupt is
cleared, as described in the INT Output section.
Operation in this mode requires that OCO and ODO
be buffered to ensure fast MOSFET turn-off and slow
MOSFET turn-on times. The relatively slow turn-off
response of the OCO and ODO open-drain outputs
alone is unsuitable for driving MOSFETs directly in this
mode.
a) DISCHARGING DIRECTION
ODI -
+
ODICMP
ODSTATUS
S
OD Q
R
ODO LOGIC
ODO
b) CHARGING DIRECTION
OCI -
CS +
CLRINT
POWER-ON ODLO ODHI
RESET
OCICMP
OCSTATUS
S
OC Q
R
OCO LOGIC
OCO
CLRINT
POWER-ON OCLO OCHI
RESET
Figure 7. Overcurrent Comparator Section Functional Diagram
*Patent pending
______________________________________________________________________________________ 11
11 Page | ||
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