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參數(shù)資料
| 型號： | L4620 |
| 廠商： | 意法半導體 |
| 英文描述： | LIQUID LEVEL ALARM |
| 中文描述： | 液位報警 |
| 文件頁數(shù)： | 4/9頁 |
| 文件大小： | 61K |
| 代理商： | L4620 |
1
*) This is a squarewave signal. The frequency is given by : f =
f
osc
.
32
1
**) The output squarewave signal frequency is given by f =
fosc.
512
The duty cycle depends on the state of the pin 8 and can be or 1 : 2 or 1 : 64, i.e. refer to figure 2, T = 320 ms, t = 160 or 5 ms when
the oscillator frequency f
osc
= 1.6 KHz.
ELECTRICAL CHARACTERISTICS
(T
amb
= 25
°
C, unless otherwise specified. Refer to block diagram
for external component values)
Symbol
V
Z
I
S
f
osc
V
7
, V
8
Parameter
Internal Zener Voltage (pin 5)
Test Conditions
Min.
4
Typ.
4.5
Max.
5
Unit
V
I
S
= 24 mA
V
S
= 3.8 V
R
osc
= 180 k
, C
osc
= 4.7 nF
Low State
High state
V
7
= V
8
= 0 V
V
7
= V
8
= V
Z
Supply Current (pin 5)
Oscillator Frequency (pin 1)
6.5
1.6
11
1.75
mA
kHz
1.45
Programming Pins Input
Voltage (pin 7, 8)
0.3
V
V
μ
A
μ
A
V
2
I
7
, I
8
Programming Pins Input Current
(pin 7, 8)
– 1
150
V
2
Sensor Drive Output Voltage, (*) V
2
= Low,
I
2
= 1 mA
V
2
= High,
I
2
= 1 mA
0.4
V
Z
–1
V
Z
–0.4
V
I
2
Sensor Driver Output Current
Sensor Input High Threshold
Voltage Versus V
2
(pin 3)
Sensor Input Low Threshold
Voltage Versus V
2
(pin 3)
– 1
0.33
1
mA
V
SENSH
/V
2
V
2
= High
V
pin 3
< V
SENSL
V
2
= High
V
pin 3
> V
SENSH
0.4
0.47
V
sens
V
2
V
clamp3L
0.15
0.22
0.29
Sensor Input Clamping Voltage
(pin 3)
– 100
μ
A < I
sens
< 100
μ
A
V
2
= Low
V
2
= High
I
3
= – 100
μ
A
I
3
= + 100
μ
A
V
sens
= High
– 0.1
0.1
V
V
clamp3H
– 0.8
– 0.6
– 0.4
V
V
Z
V
Z
+0.8
1.2
V
I
sens
Sensor Input Bias Current (pin
3)
Delay Time
μ
A
T
d
f
osc
= 1.6 kHz
V
7
= Low
V
7
= High
I
out
= 200 mA
10.24
sec
20.48
sec
V
V
out(sat)
Output Stage Saturation
Voltage (pin 6) (**)
Output Stage Overvoltage
Protection (pin 6)
Leak Current (pin 6)
1.3
V
out(clamp)
I
out
= 70 mA
19
21
23
V
I
LEAK
P6 = 15V; P7 = P8 = GND
100
μ
A
L4620
4/9
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