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參數(shù)資料
| 型號： | CA3228E |
| 廠商： | INTERSIL CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | Speed Control System with Memory |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP24 |
| 封裝： | PLASTIC, DIP-24 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 113K |
| 代理商： | CA3228E |
10-37
CA3228
to be able to supply vacuum, the gate output must be low. If
the output from the Control Amplifier exceeds 0.573V
CC
,
vacuum is supplied to the servo unit. If the output of the
Control Amplifier is between 0.573V
CC
and 0.427V
CC
the
vacuum is held in the servo unit and vehicle speed is
maintained. If the output from the Control Amplifier drops
below 0.427V
CC
or if the gate output is high, the servo unit
vacuum is vented.
Overspeed Detector Comparator
The Overspeed Detector circuit is used when the following
sequence of events occur: A speed is set in memory, the
vehicle is manually accelerated (foot pedal) to a higher
speed and then the ACCEL switch is activated.
During vehicle acceleration V
S
voltage is greater than the V
M
voltage into the memory update comparator. When the
ACCEL command is given, the capacitor at pin 15 rapidly
charges to within 60mV of V
S
before switching the compara-
tor output low and starting the fixed acceleration rate from
the present vehicle speed. The 60mV of offset is required to
insure that the output of the overspeed detector is low under
normal operating conditions. Hysteresis is also designed into
the comparator to eliminate noise problems which may
prevent the chip from going into the Acceleration mode.
End of Resume Comparator
The Resume Comparator is used when the following
sequence of events occurs: A speed is set in memory, the
brake applied, causing the vehicle to go to a lower speed,
and the RESUME switch is activated.
Activation of the RESUME switch causes a fixed accelera-
tion rate from the lower speed until the capacitor voltage at
pin 15 is equal to the V
M
voltage. A filter circuit contained in
the output of the resume comparator insures that noise
doesn’t reset the comparator until V
PIN
actually equals V
M
.
Align Voltage Source (Pin 17)
The Align Voltage Source is a X1 buffer with an output of
0.5V
CC
.
Brake Input Comparator (Pin 12)
When the Brake Input exceeds 0.55V
CC
, the chip will go into
the Standby mode from Cruise.
Minimum Speed Lockout
Assures that the system remains in a Standby mode if
vehicle speed V
S
is below 0.183V
CC
. It causes the system to
revert to the Standby mode if V
S
drops below 0.183V
CC
in
the Cruise mode.
Digital Filter for Redundant Brake and Minimum Speed
Lockout
A 4 bit shift register with an all ‘1’s output decode is used to
filter transients and electromagnetic interference. The filter
prevents false signals from putting the system into Standby
from Cruise.
Ramp Oscillator (Pin 5)
The Ramp Oscillator at pin 5 nominally varies between
amplitudes of 4.1V and 6.1V. The discharge rate is
approximately 4X the charge rate. With a capacitor of
0.001
μ
F on pin 5, the nominal oscillator frequency is 50kHz.
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