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參數(shù)資料
| 型號： | A5350CA-T |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 0K |
| 描述： | IC SMOKE DETECTOR ION 16-DIP |
| 標準包裝： | 25 |
| 類型： | 煙霧探測器 |
| 輸入類型： | 離子化 |
| 輸出類型： | 電壓 |
| 電流 - 電源： | 12µA |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-DIP |
| 包裝： | 管件 |
Ionization Smoke Detector with Interconnect
A5350
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
SENSITIVITY SET pin to a resistor divider connected between
the VDD and VSS pins.
Low Battery
The low battery condition threshold is set internally by a voltage
divider connected between VDD and VSS. The threshold can
be externally adjusted by connecting a resistor between the
LOW-V SET pin and either the VDD or VSS pins.
To increase the threshold, a resistor can be connected between
LOW-V SET and VSS. Given an initial threshold, V(th)init (nomi-
nally 7.5 V), and a target threshold, V(th)set, the resistor should
have the value:
RLOWVSET = 600E3 × K / (1 – 0.375 × K) ,
where
K = 1 / (V(th)set / [0.727 × V(th)init] – 1) .
To decrease the threshold, a resistor can be connected between
LOW-V SET and VDD. Given an initial threshold, V(th)init (nomi-
nally 7.5 V), and a target threshold, V(th)set, the resistor should
have the value:
RLOWVSET = 960E3 × K / (0.6 – 1.6 × K) ,
where
K = V(th)set / (0.727 × V(th)init) – 1 .
The battery voltage level is checked approximately every 40 sec-
onds during the (approximately) 10 mA, 10 ms LED pulse. If an
LED is not used, it should be replaced with an equivalent resistor
(typically 500 to 1000 Ω) such that the battery loading remains
about 10 mA.
I/O
A connection to the I/O pin allows multiple smoke detectors to
be interconnected. If any single unit detects smoke, its I/O pin is
driven high (after a nominal 3 s delay), and all connected units
will sound their associated horns. When the I/O pin is driven
high by another device, the oscillator immediately speeds up to
its 41.7 ms period. The remainder of the sped-up clock cycle,
and two additional consecutive clock cycles with I/O high are
required to cause an alarm. If the I/O pin falls below its threshold
at any time during those (approximately) 83.4 ms, an internal
latch is reset and there will not be an alarm. Thus, the I/O must
remain high for (approximately) 93.9 ms in order to cause an
alarm. This filtering provides significant immunity to I/O noise.
The LED is suppressed when an alarm is signaled from an
interconnected unit, and any local alarm condition causes the I/O
pin to be ignored as an input. This pin has an on-chip pulldown
device and must be left unconnected if not used.
Testing
On power-up, all internal counters are reset. Internal test cir-
cuitry allows low battery check by holding the FEEDBACK and
OSC CAP pins low during power-up, then reducing VDD and
monitoring the HORN1 pin. HORN1 will be driven high when
VDD falls below the low-battery threshold. All functional tests
can be accelerated by driving the OSC CAP pin with a 2 kHz
square wave. The 10 ms strobe period must be maintained for
proper operation of the comparator circuitry.
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| A5358CA | 功能描述:IC SMOKE DETECTOR PHOTO 16-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
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