MOS
(PTY) LTD.
Microsystems On Silicon
Member of ELMOS Semiconductor AG
M2000C
PIR Light Controller
for
3-Wire
Applications
www.mos.co.za
Rev.
1.0
General Description___________
The M2000C integrated circuit combines all required
functions for a single chip Passive Infra Red (PIR) light
controller.
It is designed for load switching with a TRIAC or a relay
in 3 wire systems.
A conventional PIR sensor connects directly to the PIR
input. The pull-down resistor and DC decoupling
circuitry are integrated on chip. The PIR signal is
converted to a 15 bit digital value.
External potentiometers or resistors are used to set the
operating parameters for sensitivity, on-time,
brightness, fade, daylight sensor and environment
temperature correction. The corresponding voltage
levels are converted to digital values with a 4 bit
resolution
All signal processing is performed digitally.
Applications_________________
Outdoor and indoor motion sensor lights
High end lighting switches
Automatic bedroom night lights
Energy saving
Features_____________________
Digital signal processing
On chip rectifier and supply regulator
Low power consumption
Temperature compensation input
Adjustable soft on/off switching (fading)
Dimmer function
Inductive load switching
Capacitive load on/off switching
Four quadrant TRIAC driver
Suitable for 115V/60Hz and 230V/50Hz applications
Low TRIAC switching noise
Application Circuit_____________________________________________
Q1
R1
C2
C1
C3
C4
LIVE
NEUTRAL
R5
S1
LDR1
L1
VSS
P1
P2
P3
P4
P5
R4
VDD
PIRIN
14
VSSA
15
VSS
16
ON-TIME
4
SENS
3
BRIGHT
1
TRIAC
18
ACIN
9
VDDA
10
DARK
6
TCOMP
5
TOG
12
RETRIG
13
RELAY
17
VDD
19
SWIN
7
CLOCK
20
FADE
2
VSW
8
TEST
11
U1
M2000C
IRA1
C5
R3
R6
VSS
R8
VDD
R2
VDD
VDD
VDD
VSS
ON
AUTO
OFF
Cx1
R7
VDD
NTC
N1
MOS
(PTY) LTD.
Microsystems On Silicon
Member of ELMOS Semiconductor AG
M2000C
PIR Light Controller
for 3-Wire Applications
www.mos.co.za
Page 2 of 5
Rev. 1.0
Electrical Characteristics_______________________________________
Absolute Maximum Ratings
Parameter
Symbol Min Max Unit Remarks
Supply Voltage
V
DD
-0.3 7 V
Current into any pin
-100
100
mA
One pin at a time
Storage Temperature
T
st
-45
125
C
Table 1: Electrical Characteristics (Stresses beyond those listed above may cause permanent damage to the device. Exposure to
absolute maximum ratings may affect the device reliability. ESD protection: all pins will be able to withstand a discharge of a 100pF
capacitor charged to 1.6kV through a 1500 series resistor. Test method: MIL-STD-883D method 3015).
Operating Conditions
(T=25
C, VDD=5V, unless stated otherwise)
Parameter Symbol
Min
Typ
Max
Unit
Remarks
Temperature
Operating temperature range
-25
25
70
C
Rectifier / Regulator
Supply voltage
V
DD
4.2 5
5.5 V
Supply current
I
DD
500
A
V
DD
=5VOutputs
unloaded
Shunt regulator current
I
ACIN
20
mA
V
DD
=6V
Digital Inputs, Schmitt triggers (TEST, TOG, RETRIG, DARK, SWIN)
Input low voltage
VIL
20
%VDD
Input high voltage
VIH
80
%VDD
Pull down current on TEST,TOG
140
A
Input to V
DD
Pull up current on RETRIG
140
A
Input to V
SS
Leakage current on DARK
1
A
Input to V
SS
or V
DD
Pull up/ pull down scanning current on
SWIN
6
mA
Input
to
V
SS
or V
DD
VSW Digital Input (window comparator)
Input low voltage
V
SWL
1 V
Input high voltage
V
SWH
V
DD
-1 V
Digital Outputs (RELAY, TRIAC)
Output low voltage
V
OL
10
%V
DD
I
SOURCE
=5mA
Output high voltage
V
OH
90
%V
DD
I
SINK
=2mA
Analog Inputs
Input voltage range
0
V
DD
V
Input leakage current (ON-TIME, SENS,
FADE, BRIGHT, TCOMP)
-1
1
A
PIRIN input resistance to V
SS
60
k
PIRIN input AC voltage
5
mV
Peak-to-Peak
Oscillator and Filter
LPF cutoff frequency
7
Hz
HPF cutoff frequency
0.5
Hz
Internal clock frequency
25.6
kHz
R5 as per table 7
Table 2: Operating Conditions
MOS
(PTY) LTD.
Microsystems On Silicon
Member of ELMOS Semiconductor AG
M2000C
PIR Light Controller
for 3-Wire Applications
www.mos.co.za
Page 3 of 5
Rev. 1.0
Detailed Description___________________________________________
Input A mplifier
Band P ass
F ilter
D riv e r
M ains Rectifier
V olta ge
Parameters
O scilator
Reg ulato r
TRI A C D riv e r
C ontroller
Relay D riv e r
A D C
A /D C onv erter
SW
I
N
BRI G H T
F A D E
O N -TI M E
SEN S
TO
G
RT
RI
G
RELA Y
TRI A C
TE
S
T
A C IN
P I RIN
VS
S
A
VS
S
DA
R
K
V D D
V D D A
CL
O
C
K
TC O M P
VS
W
Mains Rectifier
The M2000C contains an on chip half wave rectifier.
The ACIN input is connected to the mains voltage
through an external voltage dropper resistor.
Voltage Regulator
A shunt regulator between V
DD
and V
SS
limits the supply
voltage to 5V. An external capacitor has to be
connected between V
DD
and V
SS
.
Oscillator
The IC contains an on chip oscillator. The frequency is
set to about 52 kHz for 50Hz systems and 64kHz for
60Hz systems by selecting the correct resistor between
CLOCK and V
DD
. All timing signals and cutoff
frequencies of the digital filters are derived from this
frequency.
Input amplifier and A/D Converter
The PIRIN input has an internal pull-down resistor and
DC decoupling circuitry. The signal voltage on the PIR
input is converted to a 14 bit digital value.
Band-Pass Filter
A 2
nd
order digital Butterworth band-pass filter
eliminates unwanted frequency components above and
below the band of interest (0.4Hz .. 7Hz).
Threshold Comparator
The output signal from the band pass filter is digitally
rectified and its peak value compared against a
threshold value calculated from the voltages on the
SENS and TCOMP inputs. Whenever the PIR signal
exceeds the threshold, the load is switched on.
Parameter Settings
The M2000C provides for five inputs, which are used to
define the operational parameters. The voltage applied
on these inputs are converted to 4 (3) bit digital values.
A value of 16 (8) corresponds to a voltage of >VDD/4, a
value of 0 to VDD/4/16 (8).
SENS: Sets the sensitivity threshold required to
generate a trigger condition. Eight different threshold
values are possible. Refer to table 3. The threshold
value internally recalculated with the temperature
compensation factor.
BRIGHT: Sets the maximum brightness of the light. The
brightness levels are divided into 15 equal steps. One
steps corresponds to 90*(1- 1/16) degrees phase angle.
FADE: Sets the time it takes to switch the light on or off
(soft dimming). Refer to table 3.
ON-TIME: Sets the time the light remains on. Refer to
table 3.
Pin
voltage/
V
DD
On time (s)
Fade time
(s)
SENS
threshold
7/32 1280 3.7 128
6/32 640 3.3 64
5/32 320 2.8 32
4/32 160 2.1 16
3/32 80 1.2 8
2/32 40 0.9 4
1/32 20 0.3 2
0/32 10 0 1
Table 3: On-time and Fade-time
MOS
(PTY) LTD.
Microsystems On Silicon
Member of ELMOS Semiconductor AG
M2000C
PIR Light Controller
for 3-Wire Applications
www.mos.co.za
Page 4 of 5
Rev. 1.0
TCOMP: A temperature dependent resistor network can
be connected to this pin. A voltage range of
VDD*16/128 to VDD*31/128 is converted to a set of
threshold multiplication factors. The voltage on this pin
must decrease as the temperature increases. At 37C,
the voltage should be between VDD*19/128 and
VDD*20/128. Refer to table 4.
Pin
voltage/
V
DD
TCOMP
factor
Pin
voltage/
V
DD
TCOMP
Factor
<16/128 7 24/128 8
17/128 6 25/128 9
18/128 5 26/128 10
19/128 4 27/128 11
20/128 4 28/128 12
21/128 5 29/128 13
22/128 6 30/128 14
23/128 7 >31/128
15
Table 4: Temperature compensation factor
TRIAC and RELAY output drivers
The TRIAC output generates a square wave,
synchronous with the mains voltage. To control the
brightness of the light, the square wave is delayed with
regards to the mains cycle zero-crossings. The rising
edge of the square wave triggers the TRIAC for the
positive cycle and the falling edge triggers the TRIAC
for the negative cycle.
The RELAY pin is an active high output and changes
state at the start of the fading cycle.
Controller: Modes of Operation
The operating modes are determined by four digital
inputs. These digital inputs can be connected to V
DD
or
V
SS
, some can be left floating.
Pin Name
Description
SWIN
Selects the ON-AUTO-OFF mode.
V
DD
: light permanently ON
V
SS
1
: light permanently OFF
Floating: PIR sensor mode (AUTO)
TOG V
DD
: mains toggling enabled.
V
SS
or floating: mains toggling disabled.
Also refer to 'Conditions for switching the
light ON'.
RETRIG Re-trigger
Mode
V
DD
or floating: As long as movement is
detected within the on-time, the light will
remain on.
V
SS
: The light will first switch off, before it
can be switched on again.
DARK
Typically connected to a Light
Dependant Resistor (LDR) or photo
transistor, to prevent the light from
switching on during daylight conditions.
V
DD
: Enable switching of the light
V
SS
: Disables switching of the light
Do not leave this input floating
Table 5: Operational parameters
1
The toggle mode is not cancelled by setting SWIN input to
V
SS
, although the light will be switched off
Operation____________________
Power-up Mode
Whenever the circuit is powered up, the light is
switched on for the selected on-time duration. The
DARK input is ignored on power-up, to allow the user to
verify the installation during daylight conditions.
Trigger condition
The SENS threshold (refer to table 3) is multiplied with
the TCOMP factor (refer to table 4), to obtain a
temperature dependent threshold. When the filtered
PIR signal exceeds this temperature dependent
threshold, a trigger condition occurs.
Conditions for Switching the Light ON
(AUTO mode)
If a trigger condition occurs and the DARK input is high,
the light will be switched on. The light's brightness will
increase to the selected brightness within the selected
fade time.
The RELAY output is activated at the start of the fading-
on cycle.
The light and the relay will remain on for the duration
set by the ON-TIME input.
If the TOG input is high, the light can also be switched
on by toggling the mains ON-OFF-ON within 3 seconds.
In this mode, the PIR inputs are ignored, the DARK
input will switch the light ON or OFF. This mode is
disabled by disconnecting the mains for a few seconds.
Conditions for Switching the Light
OFF (AUTO mode)
The light is switched off softly after the selected ON-
TIME has elapsed, or if the DARK input senses a low
voltage. The light's brightness will reduce to zero within
the selected fade time.
The RELAY output is switched off at the start of the
fading-off cycle.
MOS
(PTY) LTD.
Microsystems On Silicon
Member of ELMOS Semiconductor AG
M2000C
PIR Light Controller
for 3-Wire Applications
www.mos.co.za
Page 5 of 5
Rev. 1.0
Device Pin Out________________________________________________
Pin No.
Name
Description
1
BRIGHT
Set maximum brightness of light
2
FADE
Set fading time of light
3
SENS
Set sensitivity threshold for switching light on
4
ON-TIME
Set light on time
5 TCOMP
Temperature
compensation
input
6
DARK
Dark mode input, connected to LDR/Photodiode
7 SWIN
ON-AUTO-OFF
select
input
8
VSW
Input voltage sensor
9
ACIN
Mains power in (rectifier)
10 V
DDA
Analog
supply
11
TEST
Reserved test mode, connect to VSS
12 TOG
Selects
Toggle
Mode
13 RETRIG
Selects
Re-trigger
mode
14
PIRIN
PIR sensor input
15 V
SSA
Analog
ground
16 V
SS
Digital
ground
17 RELAY
Relay
Output,
push-pull
18
TRIAC
TRIAC gate signal, push-pull
19 V
DD
Digital
supply
20 CLOCK
Set
oscillator
frequency
Table 6: Device Pin Out
Component Values____________________________________________
Designator Description
R1 88k (230V~) 1/2W
44k (110V~) 1/2W
R2, R3
1M
R4 10k
R5 470k
R6 180k
R7 18k
R8 33k
P1, P2, P3, P4
47k Trim pot
C1 10nF
C2 100nF
C4 470F,
16V
C3,C5 470nF
IRA1
LHI 878, Perkin Elmer
Q1
BT136 TRIAC 600V, 4A
L1
CX1
Inductor 100..1500H
100..220nF, class X (dependent on local EMC regulations)
N1 NTC
47k
LDR1*
Light Dependant Resistor
P5* Trim
pot
Table 7: Component Values for Application Circuit
Contact Information___________
Microsystems On Silicon (PTY) Ltd.
Pretoria, South Africa
Tel: +27 (12) 348 8367
Fax: +27 (12) 348 1790
Email: sales@mos.co.za
Visit our website for the latest information
Ordering Information__________
M2000C-DIP20 (Dual-in-line plastic)
M2000C-SO20-300 (Surface mount, 300 mills)
M2000C-DIE (Unpackaged devices)
Other packages are available on request.
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