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参数资料
| 型号： | L4620 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP8 |
| 封装： | MINI, DIP-8 |
| 文件页数： | 3/9页 |
| 文件大小： | 185K |
| 代理商： | L4620 |
PIN FUNCTION (Block Diagram)
N
°
Name
Function
1
Oscillator
A capacitor Cosc connected to ground and a resistor Rosc connected to pin 5 (supply
voltage) set the frequency of the internal oscillator. The period is given by: Tosc = 0.693
(Rosc + 5000) Cosc
2
Sensor Output
A squarewave is available at this pin to drive the external sensor. The output
frequency is 1/32 of the internal oscillator fosc, i.e. 50Hz using the values of
Rosc = 180k
and Cosc = 4.7nF for the external components.
3
Sensor Input
Connection for liquid level sensing. During the zero level of the squarewave signal at
pin 2, the internal sensing circuit is disabled. During the high level of the wave shape
the input is compared with a threshold which depends on the output sensor volta
VSENSH = 0.4V2 (typ). If the input voltage becomes higher than the above VSENSH, the
Vsens value is reduced to VSENSL = 0.22V2 (typ), providing an hysteresis available with
both the programmable polarities.
4
GND
This pin must be connected to ground.
5
Supply Voltage
Supply voltage input. A 4.5V (typical) zener is present at the input. The external
resistor limits the current through the zener for high supply voltages. Moreover when
the voltage at this pin is down 2.5V (typical) the internal reset circuit is activated
6
Alarm Driver
Output
An internal open collector stage is available at this pin to drive the external alarm
indicator by a rectangular waveshape. The output period depends on the external
component Rosc and Cosc. Using the recommended values of block diagram th
7
Alarm Delay
Select
This program pin selects the alarm delay to activate the output stage after a low liquid
level indication of the sensor. The delay depends on the internal oscillator frequency.
Refer to application circuit, if this pin is kept low the typical delay is 10.
8
Sensor Polarity
Select Output
Duty-cycle
Select
Through this pin it is possible to program both the sensor polarity with respect to the
internal threshold and the duty-cycle of the output waveform which drives the alarm.
When this pin is kept low the output rectangular wave duty cycle is 1:64
(T = 320ms, t = 5ms in fig. 2) and the output is activated, after the delay time, if the
voltage at pin 3 is higher than VSENS. When the voltage at this pin is high the output
duty cycle is 50% (t = 160ms) and the output goes on, after the delay
L4620
3/9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L465 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LINEAR INTEGRATED CIRCUITS |
| L-465 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:TOROID INDUCTOR |
| L465A | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:LINEAR INTEGRATED CIRCUITS |
| L-466 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:TOROID INDUCTOR |
| L-467 | 制造商:RHOMBUS-IND 制造商全称:Rhombus Industries Inc. 功能描述:LOW COST POWER INDUCTOR |
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