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PDF ICS1702 Data sheet ( Hoja de datos )
| Número de pieza | ICS1702 | |
| Descripción | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries | |
| Fabricantes | ETC | |
| Logotipo |  |
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ICS1702
QuickSaver® Charge Controller for Nickel-Cadmium
and Nickel-Metal Hydride Batteries
General Description
The ICS1702 is a CMOS device designed for the intelligent charge
control of either nickel-cadmium (NiCd) or nickel-metal hydride
(NiMH) batteries. The controller uses a pulsed-current charging
technique together with voltage slope and/or temperature slope
termination. The ICS1702 employs a four stage charge sequence
that provides a complete recharge with-out overcharging. The
controller has nine user-selectable charge rates and six user-
selectable auxiliary modes available for customized charging
systems.
The ICS1702 monitors for the presence of a battery and begins
charging when a battery is installed. Voltage and temperature are
measured to ensure a battery is within fast charge conditions before
charge is initiated.
Applications
Battery charging systems for:
- Portable consumer electronics
- Power tools
- Audio/video equipment
- Communications equipment
- Portable medical electronics
- Wireless handsets
Features
• Multiple charge termination methods include:
- Voltage slope
- Temperature slope
- Maximum temperature
- Charge timer
• Four stage charge sequence:
- Soft start charge
- Fast charge
- Topping charge
- Maintenance charge
• Reverse-pulse charging available in all charge stages
• Nine programmable charge rates between 15 minutes (4C) and
four hours (C/4)
• Out-of-temperature range detection
- Hot battery: charger shutdown
- Cold battery: low current charge
• Continuous polling mode for battery detection
• Six auxiliary modes include:
- Discharge-before-charge
- Ten hour C/10 conditioning charge
- Direct to C/40 maintenance charge
- Charging system test provided through controller
• Adjustable open circuit (no battery) voltage reference
Block Diagram
CHARGE
SELECT
OPEN CIRCUIT
REFERENCE
VOLTAGE
SENSE
TERMINATION
SELECT
TEMPERATURE
SENSE
MODE SELECT
RESET
RC
HOT
0.5V
ADC
COLD
MICROCODE CONTROL
PROCESSOR
OUTPUT
CONTROL
RAM
ROM
POLLING
MODE LED
CHARGE
MODE LED
MAINTENANCE
MODE LED
TEMPERATURE
STATUS LED
CHARGE
CONTROL
DISCHARGE
CONTROL
OSCILLATOR
QuickSaver ®® is a registered trademark of Galaxy Power, Inc.
1 page  
ICS1702
The discharge current pulse amplitude is typically set to about 2.5
times the amplitude of the charging current based on 1.4V/cell. For
example, if the charge current is 4 amps, then the discharge current
is set at about 10 amps. The energy removed during the discharge
pulse is a fixed ratio to the positive charge rate. The amplitude of
the discharge pulse does not affect the operation of the part as
described in this section.
A voltage acquisition window immediately follows a brief rest time
after the discharge pulse. No charge is applied during the rest time
or during the acquisition window to allow the cell chemistry to
settle. Since no current is flowing, the measured cell voltage is not
obscured by any internal or external IR drops or distortions caused
by excess plate surface charge. The ICS1702 makes one
continuous reading of the no-load battery voltage during the entire
acquisition window. The voltage that is measured during this
window contains less noise and is a more accurate representation
of the true state of charge of the battery. If temperature termination
is selected, the thermistor voltage is sampled after a brief rest time
once the current supply to the battery is turned on.
Topping Charge
The third stage is a topping charge that applies current at a rate low
enough to prevent cell heating but high enough to ensure a full
charge.
The topping charge applies a C/10 charging current for two hours.
The current consists of the same pulse technique used during the
fast charge stage; however, the duty cycle of the pulse sequence
has been extended as shown in Figure 5. Extending the time
between charge pulses allows the same charging current used in the
fast charge stage so that no changes to the current source are
necessary. For example, the same charge pulse that occurs every
second at a 2C fast charge rate will occur every 20 seconds for a
topping charge rate of C/10. The MMN indicator is activated
continuously during this stage.
Maintenance Charge
The maintenance charge is intended to offset the natural self-
discharge of NiCd or NiMH batteries by keeping the cells primed
at peak charge. After the topping charge ends, the ICS1702 begins
this charge stage by extending the duty cycle of the applied current
pulses to a C/40 rate. The maintenance charge will last for as long
as the battery voltage is greater than 0.5V at the VIN pin, or, if the
ten hour timer mode is enabled, until the timer stops the controller.
The MMN indicator is activated continuously during this stage.
cycle
time
delay time
cycle
time
Figure 5: Representative timing diagram for topping and maintenance charge
5
5 Page 
ICS1702
Pin Descriptions
The ICS1702 requires some external components to control the
clock rate, sense temperature and provide an indicator display. The
controller must be interfaced to an external power source that will
provide the current required to charge a battery pack and, if
desired, a circuit that will sink discharge current.
Output Logic Signals: CHG, DCHG Pins
The CHG and DCHG pins are active high, TTL compatible
outputs. In addition to being TTL compatible, the CMOS outputs
are capable of sourcing current which adds flexibility when
interfacing to other circuitry. A logic high on the CHG pin
indicates that the charging current supply should be activated. If
applicable, a logic high on the DCHG pin indicates that the
discharge circuit should be activated.
Care must be taken to control wiring resistance and inductance.
The load resistor must be capable of handling this short duration
high-amplitude pulse. If the auxiliary discharge-to-charge mode is
selected, the power dissipation of the load resistor must be properly
selected to accept the extended length of the discharge pulse.
Indicators: CMN, MMN, PFN, OTN Pins
The controller has four outputs for driving external indicators.
These pins are active low. The four indicator outputs have open
drains and are designed to be used with LEDs. Each output can
sink over 20mA which requires the use of an external current
limiting resistor. The four indicator signals denote fast charge
stage, topping and maintenance stages, and the polling detect and
out-of-temperature range modes as shown in Table 3.
The charge mode (CMN) indicator is activated continuously during
the soft start and fast charge stages. When the controller enters the
topping charge stage, the output goes high and the indicator turns
off.
The maintenance mode (MMN) indicator is on when the ICS1702
is either in the topping charge, maintenance charge, direct
maintenance mode, or the condition mode. The MMN indicator is
also lit in conjunction with the OTN indicator when cold battery
charging is in progress. The maintenance mode indicator flashes at
a one second rate when the ICS1702 is controlling the discharge
portion of the discharge-to-charge or the discharge-only mode.
The polling detect (PFN) indicator is on when the ICS1702 polls
for a battery. The controller applies periodic charge pulses to detect
the presence of a battery. The indicator is a warning that these
charge pulses are appearing at the charging system terminals at
regular intervals. When a battery is detected, the indicator is turned
off.
The out-of-temperature range (OTN) indicator is active whenever
the voltage at the temperature sense (THERM) input enters a range
that indicates that the attached battery is too hot to charge. The
OTN indicator is also activated with the MMN indicator if the
controller is initialized with the battery in the cold battery charge
region.
Charge Rate Selection: SEL0, SEL1 Pins
The SEL0 and SEL1 inputs must be programmed by the user to
inform the ICS1702 of the desired charge rate. When left
unconnected (open), these tri-level pins will float to about 2.3V.
When a low level is required, the pin must be grounded. When a
high level is required, the pin must be tied to VDD. The voltage
ranges for low (L), open (Z) and high (H) are listed in Table 10,
DC Characteristics. To program the SEL0 and SEL1 inputs, refer
to the Charge Rate List in Table 4.
The ICS1702 does not control the current flowing into the battery
in any way other than turning it on and off. The required current
for the selected charge rate must be provided by the user’s power
source. The external charging circuitry should provide current at
the selected charge rate. For example, to charge a 1.2 ampere hour
battery in 30 minutes (2C), approximately 2.4 amperes of current is
required.
PFN
on
MMN
on
on
flash
flash
flash
Table 3: Indicator Description List
CMN
on
flash
on
flash
OTN
on
on
on
on
Polling detect mode
Description
Maintenance or topping charge, direct maintenance or condition mode
Fast Charge
Hot battery shutdown
Cold Battery Charge
Discharge portion of the discharge-to-charge or discharge-only mode
see Applications Information
see Applications Information
see Applications Information
see Applications Information
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ICS1702.PDF ] | |
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