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LS6507R Datasheet(PDF) 2 Page - LSI Computer Systems

Part # LS6507R
Description  PIR SENSOR INTERFACE
Download  12 Pages
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Manufacturer  LSI [LSI Computer Systems]
Direct Link  http://www.lsicsi.com
Logo LSI - LSI Computer Systems

LS6507R Datasheet(HTML) 2 Page - LSI Computer Systems

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INPUT / OUTPUT DESCRIPTION
PIR AMPLIFIER
This is a two stage amplifier. Each stage can be set
to have its own amplification and bandwidth.
Pins 15
and 16 make up the positive and negative inputs for
Stage 1 and
Pin 1 is the output. The two inputs allow
for single-ended or differential connection to PIR
Sensors.
Pin 2 is the negative input for Stage 2. The
output of Stage 2 is applied to an internal compar-
ator. The positive input of Stage 2 is internally
biased so that the comparator’s lower and higher
threshold can be fixed relative to this bias. Only
those signals greater than a fixed threshold appear
at the output of the window comparator.
Refer to Figure 4.
LR1 / LR2 OUTPUT (LS6506R, Pin 6 / Pin7)
For the
LS6506R, a 16.66ms negative going pulse
appears on the LR1 output whenever conditions call
for the latching relay to turn on. When conditions call
for the latching relay to turn off, a 16.66ms negative
going pulse appears on the LR2 output. Each output
is capable of sinking 50mA. The outputs are gener-
ated in synchronism with the AC voltage input such
that the leading edge of these outputs always occur
when the AC voltage input switches low. Refer to
Figure 6. Potentiometers R2 and R5 are adjusted so
that the relay contacts always close and open at the
AC zero-crossover at the load.
TRIAC OUTPUT (LS6507R, Pin7)
With the output duration timer on and a 2.7V P-P
60Hz Signal applied to the AC input, the output pro-
duces a negative going 32us wide pulse in each
half-cycle delayed a nominal 1.2ms from the zero-
crossing. Refer to Figure 3. Resistors R9 and R10
are used to generate the input which is then AC-
coupled into the chip through C9.
AC INPUT (Pin 5)
This input is derived from the AC hot line input. For
the
LS6506R it is used for synchronizing the relay
drive outputs. For the
LS6507R it is used for gener-
ating the triac output. It is also the source for all tim-
ing in the
LS6506R and LS6507R.
ON/OFF INPUT (Pin 12)
The On/Off input is a momentary input used to turn the latch-
ing relay on or off (
LS6506R) or to enable or disable output
pulses to a triac (
LS6507R). Refer to the state diagrams of
Figure 5. This input has a pull-up resistor which allows the
use of a SPST momentary switch.
LDR INPUT (Pin 11)
The Light Determining Resistor (LDR) input is used to inhibit
motion from turning on the load during daylight hours. Re-
ferring to Figure 2, the ambient level for inhibiting turn-on
can be adjusted. There is also approximately 10% hysteresis
between inhibiting and enabling at the LDR input. Under cer-
tain conditions the LDR input is also used to keep the load
off when motion is detected. Refer to Figure 5, Mode 1.
TIME CONTROL INPUT (Pin 13)
The voltage level at the time out control input selects 5 differ-
ent timeouts and the Walking Test as shown in Table 1. A
potentiometer can be used for these selections as shown in
Figure 2.
MODE INPUT (Pin 10)
This input has a pull-up resistor. When this input is left float-
ing, Mode 1 is selected. When this input is tied to ground,
Mode 2 is selected.
LED OUTPUT (Pin 9)
This is an open drain output which generates negative-going
pulses whenever motion is detected. The output is not af-
fected by the LDR input. It is used to sink current from a se-
ries Resistor – LED network as shown in Figure 3.
5V REGULATOR OUTPUT (Pin 14)
This regulator is used to provide power to the PIR sensor
and the internal PIR amplifiers as well as the external time-
out and LDR networks.
6506R-042908-2


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