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參數(shù)資料
| 型號： | ICS1700AM |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| 中文描述： | QuickSaver充電控制器的鎳鎘和鎳氫電池 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 204K |
| 代理商： | ICS1700AM |
10
ICS1700A
Figure 7:Voltage levels for temperature
sensing with a thermistor or thermal switch
The THERM pin requires some thought if a thermistor is going to
be used for hot and cold battery detection. The example below
works for a typical 10k
@ 25
°
C NTC thermistor. Consider using
the controller to prevent charging above 45
°
C and reducing the
current below 10
°
C. At 10
°
C the resistance of the thermistor is
18k
. At 45
°
C, the resistance drops to 4.7k
. The
ICS1700A
has
an internal voltage threshold at 10
°
C at 2.4V, and an internal
voltage at 45
°
C at 0.93V as shown in Figure 7. At 25
°
C the voltage
at the THERM pin is set at the midpoint of the thresholds:
0.93V + 2.40V - 0.93V =1.67V.
2
The THERM pin has a 75k
internal pull-up (R
pu
). Using a
resistor divider with 10k
for the thermistor (R
th
) and a external
fixed resistor (R
fix
), the divider looks like Figure 8 at 25
°
C:
Master Reset: MRN Pin
The MRN pin is provided to re-program the controller for a new
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 change charge
rates or clear a temperature fault condition. Upon power-up, the
controller automatically re-sets 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 V
DD
. An external capacitor
must be connected between this pin and ground. The frequency of
the internal clock will be about 1 MHz with a 16k
resistor 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
.
Temperature Sensing: THERM Pin
The THERM pin is provided for hot and cold battery detection and
for maximum temperature termination of fast charge when used in
conjunction with an NTC thermistor. The THERM pin also
provides for hot battery and maximum temperature termination
when used in conjunction with a normally closed thermal switch.
Several internal voltage thresholds are used by the controller
depending on whether a thermistor or a thermal switch is used.
Figure 7 shows the internal thresholds over laid on a typical
thermistor curve.
Using an NTC thermistor for hot and cold battery
detection:
Figure 8: Voltage divider at the THERM pin
at 25
°
C
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ICS1700AMT | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700AN | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700AS | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700AST | QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1708N | IC REG LDO 1A 10V TO220FP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICS1700AMT | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700AN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700AS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700AST | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:QuickSaver Charge Controller for Nickel-Cadmium and Nickel-Metal Hydride Batteries |
| ICS1700M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Battery Management |
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