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Master PIR Control Chip



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KC778B 데이터시트, 핀배열, 회로
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 데이터시트, 핀배열, 회로
Pin Assignment :
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
20 pin DIP or SOIC
Pin Name
1 Vcc
2 Sensitivity Adjust
3 Offset Filter
4 Anti-Alias
5 DC CAP
6 VReg
7 Pyro (D)
8 Pyro (S)
9 Gnd (A)
10 Gnd (D)
11 Daylight Adjust
12 Daylight Sense
13 Gain Select
14 ON/AUTO/OFF
15 Toggle
16 OUT
17 LED
18 C
19 R
20 FRef
Description
Supply Voltage (5 V)
PIR Motion Sensitivity Input
PIR Motion Offset Filter
PIR Anti-Alias Filter
PIR Gain Stabilization Filter
Voltage Regulator Output
Pyro Drain Reference
Pyro Source Input Signal
Analog Circuitry Ground
Digital Circuitry Ground
Daylight Adjustment and CdS Input
Silicon Photo Diode Input
PIR Gain Select Tri-State Input
Mode Select Tri-State Input
Mode Select Toggle Input
Lights ON/OFF Output
PIR Motion Indicator Output
OFF Timer Oscillator Input
OFF Timer Oscillator Output
Frequency Reference Oscillator
Pin Descriptions
1. Vcc : This is the regulated supply voltage to the chip (nominally 5 V).
2. Sensitivity Adjust: This pin is used to adjust the sensitivity threshold of the motion comparators. When the
voltage on this pin equals the pyro drain reference voltage on pin 7 the PIR sensitivity will be minimum
(±500 mV). When the voltage on this pin is Gnd the PIR sensitivity will be maximum (±125 mV).
Intermediate voltages will provide intermediate sensitivities.
3. Offset Filter: This pin connects to an external capacitor of 10 µF and holds the average value of the
switched capacitor bandpass filter output. Motion is detected when the difference between this average and
the actual filter output is greater than the sensitivity setting. The output of the switched capacitor bandpass
filter can be seen directly on this pin if the external capacitor is disconnected, however, motion will not be
detected under these conditions.
4. Anti-Alias: This pin connects to an external capacitor of 0.1 µF providing low pass filtering of the PIR
input signal, blocking input signals at and above the switching frequency of the switched capacitor
bandpass filter.
_________________________________________________________________________________________
2 KC778B




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