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MODEL : DC-SD-003
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- : (IONIZATION SOMKE CHAMBER) - : 0.3 ~ 5 % / foot () - : 3 - : 9V BATTERY/ - :75dB - : (0~5.5V) - : 10 - : -20~50 - : 0~95%R.H(NON-CONDENSING) - : MONITORING UNIT-METAL, SENSOR UNIT-ALUMINUM . - : , 2 , , , . , , , - : Ionization Smoke Chamber - : Nemoto & Co., Ltd. () * foot - IC .
IC IC . IC .
5348 SMOKE DETECTOR with INTERCONNECT and TIMER
Sensitivity Adjust. The detector sensitivity to smoke is set internally by a voltage divider connected between VDD and V SS. The sensitivity can be externally adjusted to the individual characteristics of the ionization chamber by connecting a resistor between pin 13 and VDD, or between pin 13 and VSS. Low Battery. The low battery threshold is set internally by a voltage divider connected between VDD and VSS. The threshold can be increased by connecting a resistor between pin 3 and VDD. The threshold can be decreased by connecting a resistor between pin 3 and VSS. The battery voltage level is checked every 40 seconds during the 10 mA, 10 ms LED pulse. If an LED is not used, it should be replaced with an equivalent resistor (typically 500 to 1000 ) such that the battery loading remains at 10 mA. Timer. An internal timer is provided that can be used in various configurations to allow for a period of reduced smoke detector sensitivity ("hush"). When a high-to-low transition occurs at pin 1, the internal timer is reset, the timer mode enabled, and the circuit reset to a no alarm condition. The LED will flash at a 10 second rate. If the level of smoke is increased such that the reduced sensitivity level is reached, the device will go into the alarm condition. The timer, however, will continue to completion of the nominal 10-1/4 minute period (368 clock cycles). If the timer mode is not used, pin 1 should be tied low. I/O. A connection is provided at pin 2 to allow multiple smoke detectors to be commoned. If any single unit detects smoke (I/O is driven high), all connected units will sound their associated horns after a nominal 3 second delay. The LED is suppressed when an alarm is signaled from an interconnected unit.
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TYPICAL APPLICATION
50 k
9V TIMER MODE
200 k
200 k
TO OTHER UNITS
1 200 2 NOTE 3 330 5 6 8.2 M 7 1 F 8 V SS V DD 3 4 LOGIC
16 15 14 OSC. & TIMING 13 12 11 10 9 0.1 F
PUSH TO TEST
NOTE 1
HORN DRIVER
1 M
200 k
0.001 F
NOTE 2
Dwg. EC-005A
NOTE 1:Use an external resistor to adjust sensitivity for a particular smoke chamber. NOTE 2:Select resistor to reduce sensitivity during timer mode. NOTE 3:A resistor to ground or V DD may be added to this pin to modify low battery voltage threshold.
Testing. On power up, all internal counters are reset. Internal test circuitry allows for low battery check by holding pins 8 and 12 low during power up, then reducing VDD and monitoring HORN1 (pin 10). All functional tests can be accelerated by driving pin 12 with a 2 kHz square wave. The 10 ms strobe period must be maintained for proper operation of the comparator circuitry.
6
5
4
3
2
LTR
1
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REVISION RECORD ECO NO: APPROVED: DATE:
SMOKE DETECTOR DS-SD-003
D
+9V
D
CW
47K 2
+9V
1 R9
VR1
3
8
20K 2 R7 +9V 2 1 2 3 -
1 2
+9V
10K 1 2 R8 1 4 3 2 1
TB1
U2-A + 4
R1 1
200K
C
No. 1 2 3 4 5 6
C2 A D1
SW1 1 1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 2
BZ1 C1 C2 LED1 S1 R3 R1 R6 R4 R2 SW1 SW2 R7 R8 R9 VR1 TB1 U2
SF1205A CAP 104 1uF/50V RED LED NIS-05A R 1M R 200K R 330 R 8.2M ON/OFF TS-1180 R 20K R 10K R 47K VRES 103 CON 4 PIN LM358
1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1
LED K
R4 1 330 1 8.2M R2 2 2
TSTART GUARD2 I/O DETECT LSET GUARD1 TOUT SENSET LED OSCCAP +V HORN2 TRES HORN1 FB -V U1 5348
4
1
U1
1
2
Reference
Name-Value A5348CAT
QTY.
+9V
TIME SW
R6 + 2
200K
C
1 NIS-05A 2 1
SW2
TEST SW
1 BZ1
2 C1 0.1u
R3 1 1M
B
7 8 9 10 11 12 13 14 15 16 17 18
B
A
A
COMPANY:
DAESHIN ELECTRONICS CO., LTD.
TITLE: DRAWN: HARRY PHAM CHECKED: QUALITY CONTROL: RELEASED: DATED: DATED: DATED: DATED: SCALE: SHEET: 1 OF 1 CODE:
DS-SD-003
SIZE: DRAWING NO: REV:

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