- 您现在的位置：买卖IC网 > PDF目录359129 > MC14467P-1 (飞思卡尔半导体(中国)有限公司) Low-Power CMOS Ionization Smoke Detector IC PDF资料下载
参数资料
| 型号： | MC14467P-1 |
| 厂商： | 飞思卡尔半导体(中国)有限公司 |
| 英文描述： | Low-Power CMOS Ionization Smoke Detector IC |
| 中文描述： | 低功耗CMOS集成电路电离烟雾探测器 |
| 文件页数： | 5/8页 |
| 文件大小： | 238K |
| 代理商： | MC14467P-1 |
Sensors
Freescale Semiconductor
5
MC14467-1
DEVICE OPERATION
Timing
The internal oscillator of the MC14467-1 operates with a
period of 1.67 seconds during no-smoke conditions. Each
1.67 seconds, internal power is applied to the entire IC and a
check is made for smoke, except during LED pulse, Low
Battery Alarm Chirp, or Horn Modulation (in smoke). Every 24
clock cycles a check is made for low battery by comparing
V
DD
to an internal zener voltage. Since very small currents
are used in the oscillator, the oscillator capacitor should be of
a low leakage type.
Detect Circuitry
If smoke is detected, the oscillator period becomes 40 ms
and the piezoelectric horn oscillator circuit is enabled. The
horn output is modulated 160 ms on, 80 ms off. During the off
time, smoke is again checked and will inhibit further horn
output if no smoke is sensed. During smoke conditions the
low battery alarm is inhibited, but the LED pulses at a 1.0 Hz
rate.
An active guard is provided on both pins adjacent to the
detect input. The voltage at these pins will be within 100 mV
of the input signal. 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 op amp is not power strobed and thus gives constant
protection from surface leakage currents. Pin 15 (the Detect
input) has internal diode protection against static damage.
Sensitivity/Low Battery Thresholds
Both the sensitivity threshold and the low battery voltage
levels are set internally by a common voltage divider (please
see
Figure 2
) connected between V
DD
and V
SS
. These
voltages can be altered by external resistors connected from
pins 3 or 13 to either V
DD
or V
SS
. There will be a slight
interaction here due to the common voltage divider network.
The sensitivity threshold can also be set by adjusting the
smoke chamber ionization source.
Test Mode
Since the internal op amps and comparators are power
strobed, adjustments for sensitivity or low battery level could
be difficult and/or time-consuming. By forcing Pin 12 to V
SS
,
the power strobing is bypassed and the outputs, Pins 1 and
4, constantly show smoke/no smoke and good battery/low
battery, respectively. Pin 1 = V
DD
for smoke and Pin 4 = V
DD
for low battery. In this mode and during the 10 ms power
strobe, chip current rises to approximately 50
μ
A.
LED Pulse
The 9-volt battery level is checked every 40 seconds
during the LED pulse. The battery is loaded via a 10 mA
pulse for 10 ms. If the LED is not used, it should be replaced
with an equivalent resistor such that the battery loading
remains at 10 mA.
Hysteresis
When smoke is detected, the resistor/divider network that
sets sensitivity is altered to increase sensitivity. This yields
approximately 100 mV of hysteresis and reduces false
triggering.
Figure 6. Typical Application as Ionization Smoke Detector
MC14467-1
1
16
2
3
4
5
6
7
8
15
14
13
12
11
10
9
Test
+
9.0 V
8.2 M
330
1.5 M
*
220 k
*
0.1 μF
1M
1M
0.1 μF
0.001* μF
*NOTE: Component values may change depending on type of piezoelectric horn used.
相关PDF资料 |
PDF描述 |
|---|---|
| MC14467-1 | Low-Power CMOS Ionization Smoke Detector IC |
| MC14467P1 | Low-Power CMOS Ionization Smoke Detector IC |
| MC14489B | Multi-Character LED Display/Lamp Driver(多字符LED显示/ 指示灯驱动器) |
| MC1458 | Voltage-Feedback Operational Amplifier |
| UA740 | 7 e 1 channels switch array |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC14468P | 功能描述:IC SMOKE DETECT IONIZATN 16-DIP RoHS:否 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| MC14489BDW | 功能描述:IC DRIVER LED/LAMP 5CH 20-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 显示器驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 显示器类型:真空荧光 (VF) 配置:5 x 7（矩阵） 接口:串行 数字或字符:- 电流 - 电源:3.5mA 电源电压:2.7 V ~ 3.6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:16-SSOP（0.154"，3.90mm 宽） 供应商设备封装:16-QSOP 包装:带卷 (TR) |
| MC14489BDWE | 功能描述:LED显示驱动器 5 CHANNEL LED DRIVER RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MC14489BDWER2 | 功能描述:LED显示驱动器 5 CHANNEL LED DRIVER RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MC14489BDWER2-CUT TAPE | 制造商:Freescale 功能描述:MC14489 Series 5.5 V 5 Channel Multi Character Led Display/Lamp Driver SOIC-20 |
发布紧急采购，3分钟左右您将得到回复。