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KC778B Schematic ( PDF Datasheet ) - COMedia

Teilenummer KC778B
Beschreibung Master PIR Control Chip
Hersteller COMedia
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Gesamt 9 Seiten
KC778B Datasheet, Funktion
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






KC778B Datasheet, Funktion
Application Circuit
1. Typical Hook-up
Below is a typical hook up for connecting KC778B to a PIR sensor, a TRIAC light switch and a silicon
photodiode daylight detector. VReg is used for voltage regulation. 2 slide switches are used. One for select
ON/AUTO/OFF and the other one used for enable, disable the daylight sensor and disable auto-on function.
A simple AC regulation circuit is used in this system such that only a small gate current TRIAC can be
used.
8550
10uF
470uF
C9014
.1uF
470
12V
1N
4004 X2
.47uF
400V
100
1W
470K
.01uF
400V
(L)
LIGHT
200V
AC
TRIAC
(N)
MAX
KC778B
330K
500K
1 VCC
OSC 20
.022uF
MIN
10uF
2 PIR
SENS
3 OFFSET
FILTER
R
R 19
OFF TIMER
C 18
C
.1uF
4 LP
FILTER
LED 17
10uF
TAN
5 DC
CAP
6 VREG
OUT 16
TOGGLE 15
TOGGLE ON-OFF
.1uF
7 PYRO
(D)
ON/OFF 14
AUTO
ON
20K
PIR
200pF
8 PYRO
(S)
47K 9 GND
(A)
10 GND
(D)
GAIN 13 NC
DAY 12
SENS
DAY 11
ADJ
OFF
DISABLE AUTO-ON
DISABLE DAY SENS
DAY SENSOR
5M PHOTO
DIODE
1K
SW 2P3T
Note : Off Time Delay = 5678 x (R+40,000) x C Second
R in Ohm, C in Farad
_________________________________________________________________________________________
6 KC778B

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