参数资料
| 型号： | AS1923A-BSTT-O |
| 厂商： | ams |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR QUAD OPEN SOT23-6 |
| 标准包装： | 1 |
| 类型： | 多压监控器 |
| 监视电压数目： | 4 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 120 ms |
| 电压 - 阀值： | 2.93V，4.38V，可调，-4.38V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 其它名称： | AS1923A-BSTT-ODKR |
AS1923
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Negative Voltage Monitoring Beyond -5V
The AS1923 is available with options to monitor -5V supplies using internally trimmed thresholds. In cases where monitored supplies are more
negative than -5V, an external low-impedance resistor-divider network can be used as shown in Figure 14 .
The current through the external resistor-divider should be greater than the input current for the -5V monitor options. For an input monitor current
error of <1%, the resistor-divider current should be ≥ 2mA (for I IN4 = 20μA max).
Figure 14. Negative Voltage Monitoring Beyond -5V
R 2
-5V
R 1
V REF =
+
–
+
V INTH
1.23V
–
For the circuit shown in Figure 14 , calculate R 1 based on the desired V IN x reset threshold voltage:
R 1 = R 2 × ? ---------------- – 1 ?
V INTH
? 1,23V ?
(EQ 3)
R 1 = 2,49k Ω × ? ------------------- – 1 ?
Where:
R 2 ≤ 2.49k Ω
V INTH is the desired threshold voltage.
V TH is the internal threshold voltage.
For -V IN = -12V nominal:
V INTH = -11.1V,
V TH = -4.63V,
R 2 = 2.49k Ω .
Using the equation given in (EQ 3), R 1 can be calculated as:
– 11,1V
? – 4,63V ?
Therefore, R 1 = 3.48k Ω
Power-Supply Bypassing and Grounding
The AS1923 is powered from the IN2 supply input. All monitor inputs are immune to fast supply transients.
If higher immunity is required in noisy systems, connect 0.1μF bypass capacitors from the IN2 input to ground (see Figure 15) . Additional capac-
itance can be added to IN1, IN3, and IN4 to improve noise immunity at these inputs.
Figure 15. IN2 Additional Noise Immunity
3.0 to
3.3V
0.1μF
5
IN2
2
GND
AS1923
Revision 1.01
11 - 16
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相关代理商/技术参数 |
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|---|---|
| AS1923A-BSTT-x | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Quad-Voltage Microprocessor Supervisory Circuit |
| AS1923B-BSTT-x | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Quad-Voltage Microprocessor Supervisory Circuit |
| AS1925 | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Ultra-Low Voltage Microprocessor Supervisory Circuit with Manual Reset |
| AS1925-BSTT | 制造商:AMSCO 制造商全称:austriamicrosystems AG 功能描述:Ultra-Low Voltage Microprocessor Supervisory Circuit with Manual Reset |
| AS1925BSTTD07 | 制造商:ams 功能描述:IC MPU SUPERVISOR 12 uA 1.8V 5-SOT-2 制造商:ams 功能描述:T&R / SOT23-5 |
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