DataSheet.es    


PDF ICS1722 Data sheet ( Hoja de datos )

Número de pieza ICS1722
Descripción 16 Pin Quicksaver Charge Controller For Ni-cd & Ni-mh Batteries
Fabricantes Galaxy Power 
Logotipo Galaxy Power Logotipo



Hay una vista previa y un enlace de descarga de ICS1722 (archivo pdf) en la parte inferior de esta página.


Total 24 Páginas

No Preview Available ! ICS1722 Hoja de datos, Descripción, Manual

ICS1722
QuickSaver® Charge Controller for Nickel-Cadmium
and Nickel-Metal Hydride Batteries
General Description
The ICS1722 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 termination. The ICS1722
employs a four stage charge sequence that provides a complete
recharge without overcharging. The controller has nine user-
selectable charge rates and six user-selectable auxiliary modes
available for customized charging systems.
The ICS1722 monitors for the presence of a battery and begins
charging when a battery is installed. The ICS1722 is for
applications where temperature sensing is not required by the
charge controller.
Applications
Battery charging systems for:
- Portable consumer electronics
- Power tools
- Audio/video equipment
- Communications equipment
Features
Charge termination methods include:
- Voltage slope
- Charge timers
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)
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
RESET
OPEN CIRCUIT
REFERENCE
VOLTAGE
SENSE
MODE SELECT
CHARGE
SELECT
RC
0.5V
ADC
www.DataSheet4U.com
MICROCODE CONTROL
PROCESSOR
OUTPUT
CONTROL
RAM
ROM
OSCILLATOR
POLLING
MODE LED
CHARGE
MODE LED
MAINTENANCE
MODE LED
CHARGE
CONTROL
DISCHARGE
CONTROL
www.DataSheet4U.com

1 page




ICS1722 pdf
ICS1722
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 ICS1722 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.
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 ICS1722 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





ICS1722 arduino
ICS1722
Master Reset: MRN Pin
The MRN pin is provided to re-program the controller for a new
mode or charging sequence. This pin has an internal pull-up of
about 75k. A logic low on the MRN pin must be present for more
than 700ms for a reset to occur. As long as the pin is low, the
controller is held in a reset condition. A master reset is required to
clear the charging system test, reset the ten hour timer, change
charge rates or auxiliary modes. Upon power-up, the controller
automatically resets itself.
Clock Input: RC Pin
The RC pin is used to set the frequency of the internal clock when
an external 1 MHz clock is not available. An external resistor must
be connected between this pin and VDD. An external capacitor
must be connected between this pin and ground. The frequency of
the internal clock will be about 1 MHz with a 16kresistor and a
100pF capacitor. All time durations noted in this document are
based on a 1 MHz clock. Operating the clock at a lower frequency
will proportionally change all time
durations. Operating the clock at a frequency significantly lower
than 1 MHz, without adjusting the charge current accordingly, will
lessen the effectiveness of the fast charge timer and lower the
accuracy of the controller. Operating the clock at a frequency
greater than 1 MHz will also change all time durations and, without
adjusting the charge current accordingly, may cause termination to
occur due to the fast charge timer expiring rather than by the
battery reaching full charge.
The clock may be driven by a 1 MHz external 0 to 5V pulse
provided the duty cycle is between 10% and 60%. The clock input
impedance is about 1k.
Voltage Input: VIN Pin
The battery voltage must be normalized by an external resistor
divider network to one cell. The electrochemical potential of one
cell is about 1.2V. For example, if the battery consists of six cells
in series, the voltage at the VIN pin must be equal to the total
battery voltage divided by six. This can be accomplished with two
resistors, as shown in Figure 7. To determine the correct resistor
values, count the number of cells to be charged in series. Then
choose either R1 or R2 and solve for the other resistor using:
R1 = R2 * (# of cells -1) or R2 =
R1
(# of cells -1)
# of cells
VIN pin
R1
R2
Figure 7: Resistor divider network
at the VIN pin
Open Circuit Voltage Reference: OPREF Pin
The OPREF pin has an internal 75kpull-up resistor to VDD.
OPREF requires an external pull-down resistor to establish the
open circuit (no battery) voltage reference. The purpose of this
voltage reference is to detect the removal of the battery from the
charging system. The voltage at this pin is compared to the voltage
at the VIN pin when the current source is turned on. If the voltage
at VIN is greater than the voltage at OPREF, the ICS1722 assumes
the battery has been removed and the ICS1722 enters the polling
detect mode.
For proper operation, the voltage at OPREF must be set below the
(divided down) open circuit voltage produced by the current source
and above the maximum normalized battery voltage. The OPREF
pin voltage must not exceed 2.3V or it will prevent the start of fast
charge. If the voltage on OPREF exceeds 4V, the controller will
shutdown and must be reset.
As an example, suppose that a current source has an open circuit
voltage of 12V as shown in Figure 8. The maximum expected
battery voltage of a six-cell pack is determined to be 9.6V. The
voltage at OPREF should be set at a point between 1.6V (9.6V/6
cells=1.6V) and 2V (12V/6=2V). This is accomplished with a pull-
down resistor. Refer to the VIN and OPREF resistor tables in the
Applications Information section. From the VIN table, the divider
resistors are 10kand 2kfor R1 and R2. From the OPREF
table, the pull-down resistor is 43kfor R3. If R3 is 43k, the
voltage at OPREF is 1.82V since the internal pull-up at the OPREF
pin is 75k.
11

11 Page







PáginasTotal 24 Páginas
PDF Descargar[ Datasheet ICS1722.PDF ]




Hoja de datos destacado

Número de piezaDescripciónFabricantes
ICS1720Charge ControllerIntegrated Circuit Systems
Integrated Circuit Systems
ICS172216 Pin Quicksaver Charge Controller For Ni-cd & Ni-mh BatteriesGalaxy Power
Galaxy Power
ICS1722Charge ControllerIntegrated Circuit Systems
Integrated Circuit Systems
ICS1726-11Low EMI Clock GeneratorIntegrated Circuit Systems
Integrated Circuit Systems

Número de piezaDescripciónFabricantes
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


DataSheet.es    |   2020   |  Privacy Policy  |  Contacto  |  Buscar