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參數(shù)資料
| 型號(hào)： | 5367CA |
| 英文描述： | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 中文描述： | 工業(yè)控制IC |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 152K |
| 代理商： | 5367CA |
5367
SMOKE DETECTOR
WITH
INTERCONNECT
AND
TIMER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
4
Timer Start Input Current
1
V
IN
= 9.0 V
20
80
μ
A
Timer Out Output Current
4
V
OUT
= 0.5 V
500
μ
A
LED Output ON Current
5
V
DD
= 7.2 V, V
OUT
= 1.0 V
10
mA
LED Output ON Time
5
No Local Alarm; Not Latched
8.0
10
12
ms
LED Output OFF Time
5
No Alarm, In Standby
32
40
48
s
No Alarm, Timer Mode
8.0
10
12
s
I/O Current
2
No Alarm, V
I/O
= V
DD
- 2.0 V
25
60
μ
A
Alarm, V
I/O
= V
DD
- 2.0 V
-7.5
mA
Charge Dump, V
I/O
= 1.0 V
5.0
mA
I/O Charge Dump Duration
2
After Local Alarm or Test
1.33
1.66
1.99
s
I/O Alarm Voltage
2
External Alarm In
3.0
V
I/O Delay
2
Alarm Out
3.0
s
Supply Current
6
V
DD
= 9.0 V, No Alarm, No Loads
5.0
9.0
μ
A
V
DD
= 12 V, No Alarm, No Loads
12
μ
A
Test
Pin
Limits
Characteristic
Test Conditions
Min.
Typ.
Max.
Units
ELECTRICAL CHARACTERISTICS continued
NOTE 1:
NOTE 2:
Negative current is defined as coming out of (sourcing) the specified device pin.
Alarm (Smoke) Condition is defined as V
15
< V
13
; No Alarm (No Smoke) Condition as V
15
> V
13
.
CIRCUIT DESCRIPTION
The A5367CA is a low-current CMOS circuit
providing all of the required features for an
ionization-type smoke detector.
Oscillator.
An internal oscillator operates
with a period of 1.67 seconds during no-
smoke conditions. Every 1.67 seconds,
internal power is applied to the entire circuit
and a check is made for smoke. Every 24
clock cycles (40 seconds), the LED is pulsed
and a check is made for low battery by
comparing V
DD
to an internal reference.
Since very-low currents are used in the
device, the oscillator capacitor at pin 12
should be a low-leakage type (PTFE, polysty-
rene, or polypropylene).
Detector Circuitry.
When smoke is detected, the resistor divider
network that sets the sensitivity (smoke trip point) is altered to increase
the sensitivity set voltage (pin 13) by typically 130 mV with no exter-
nal connections to pins 3 or 13. This provides hysteresis and reduces
false triggering. An active guard is provided on both pins adjacent to
the detector input (pin 15). The voltage at pins 14 and 16 will be
within 100 mV of the input. This will keep surface leakage currents to
a minimum and provide a method of measuring the input voltage
without loading the ionization chamber. The active guard amplifier is
not power strobed and thus provides constant protection from surface
leakage currents. The detector input has internal diode protection
against static damage.
Alarm Circuitry.
If smoke is detected, the oscillator period changes
to 40 ms and the horn is enabled. The horn output is typically 0.5 s
ON, 0.5 s OFF, 0.5 s ON, 0.5 s OFF, 0.5 s ON, 1.5 s OFF (temporal
horn pattern). During the OFF time, smoke is checked and will inhibit
further alarm output if smoke is not sensed. During smoke conditions
the low battery alarm is inhibited and the LED is driven at a 1 Hz rate.
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