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參數(shù)資料
| 型號： | L4620 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | LIQUID LEVEL ALARM |
| 中文描述： | 液位報警 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大小： | 61K |
| 代理商： | L4620 |
PIN FUNCTION
(Block Diagram)
N
°
1
Name
Function
Oscillator
A capacitor C
osc
connected to ground and a resistor R
osc
connected to pin 5 (supply
voltage) set the frequency of the internal oscillator. The period is given by: T
osc
= 0.693
(R
osc
+ 5000) C
osc
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
R
osc
= 180k
and C
osc
= 4.7nF for the external components.
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
V
SENSH
= 0.4V
2
(typ). If the input voltage becomes higher than the above V
SENSH
, the
V
sens
value is reduced to V
SENSL
= 0.22V
2
(typ), providing an hysteresis available with
both the programmable polarities.
This pin must be connected to ground.
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
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 R
osc
and C
osc
. Using the recommended values of block diagram th
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.
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 V
SENS
. When the voltage at this pin is high the output
duty cycle is 50% (t = 160ms) and the output goes on, after the delay
2
Sensor Output
3
Sensor Input
4
5
GND
Supply Voltage
6
Alarm Driver
Output
7
Alarm Delay
Select
8
Sensor Polarity
Select Output
Duty-cycle
Select
L4620
3/9
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