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PDF KC778B Data sheet ( Hoja de datos )
| Número de pieza | KC778B | |
| Descripción | Master PIR Control Chip | |
| Fabricantes | COMedia | |
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KC778B
Master PIR Control Chip (MPCC)
Specification
___________________________________________________________________________
General :
The MPCC has been designed for easy implementation
of AC control functions that use a Passive Infra-Red
(PIR) motion detector. Due to its high sensitivity and
reliability, it is also widely used in security product.
• Minimum external component
• High senstivity
• High RFI immunity
• Daylight adjustment
• Off delay timer
20 pin DIP
Features:
A) Circuit design maximizes performance while minimizing external component count and board layout space.
B) Low cost solution for PIR motion control switching applications.
C) High sensitivity PIR input with special noise cancellation circuitry.
D) Choice of two PIR gain settings: 62 db and 68 db.
E) Adjustable PIR sensitivity.
F) Internal switched capacitor bandpass filter reduces external component count and improves reliability by
minimizing sensitivity to external component values.
G) RFI noise immunity exceeds 30 V/m from 1 MHz to 1000 MHz.
H) High immunity to line frequency noise.
I) Daylight detector circuitry is designed to use either silicon photo diode or CdS detector.
J) Adjustable daylight detector sensitivity.
K) Adjustable OFF timer accuracy is determined by external components.
L) Output can directly drive TRIACs, opto-couplers and small relays (no buffering required).
M) Four main operating modes can be used in any combination:
1)Auto-ON: Load turns on when motion is detected (adjustable sensitivity).
Adjustable daylight detector disables Auto-ON during daytime.
Auto-ON mode can be disabled.
Daylight detector can be disabled.
2)Auto-OFF: Adjustable OFF timer activates whenever motion stops.
Load turns off if there is no motion during the time delay.
If Auto-ON mode is disabled, the load will turn on if there is motion within 6 seconds
after turn-off. (If the load goes off because you stopped moving (reading a book for
example), you have 6 seconds to wave your arm to turn the load back on.)
Auto-OFF mode can be disabled.
3)Manual-ON: Load turns on manually, with a momentary contact switch.
4)Manual-OFF: Load turns off manually, with a momentary contact switch.
mLoad will remain off for 25 seconds, even if there is motion during this time (to give you
otime to leave the room).
.cN) If the ON/AUTO/OFF input is held either high or low, the load will be held ON or OFF respectively,
uoverriding all other modes, until the input returns to the AUTO position.
t4O) If the Toggle input is held low, the load will change from on to off or from off to on, and will be held in
ethat state, overriding all other modes, until the input returns high.
eP) When power is restored after an outage, the load will be OFF and motion will be ignored for 25 seconds.
hQ) Operating chip voltage is 4 - 15V.
tasR) Operating chip current is typically 300 µA.
S) Chip is ESD protected to more than 1000 V (human body model).
aT) Operates with 50-60 Hz AC line frequency.
.d_________________________________________________________________________________________
www KC778B
Rev C, 1996
1 page  
7. OFF timer delay = 5678 x (R+40,000) x C seconds, R is in Ohms, C is in Farads.
8. The Sensitivity Adjust pot is used to select a voltage between the pyro drain reference voltage (minimum
sensitivity) and Gnd (maximum sensitivity). The value of the pot is not critical and any value between 100
KΩ and 5 MΩ can be used.
9. The output of the switched capacitor bandpass filter can be seen on pin 3 (Offset Filter) when the external
capacitor(10µF) is disconnected. The filter response can be measured in this way. (Disconnecting the
external capacitor prevents motion from being detected.)
10. Pin 8 (Pyro (S)) is a sensitive node and the external interconnect to this pin should be made as short as
possible. This node should also be closely surrounded by a ground plane.
Block Diagram
Sensitivity
Adjust
Offset Filter
Pyro (D)
Pyro (S)
Gain Select
Anti-Alias
DC Cap
VCC
PIR Front End
Amplifiers and
Noise Cancellation
Circuitry
Switched
Capacitor
Bandpass Filter
FRef
R
C
On/Auto/off
Toggle
Daylight
Sense
Daylight
Adjust
Oscillation and
Synchronization
Circuitry
Daylight Detector
Amplifier and
Comparator
Threshold
Comparators
and Timing
Circuitry
LED
OUT
Voltage Regulator
Vreg
GND
_________________________________________________________________________________________
MPCC
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet KC778B.PDF ] | |
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