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參數(shù)資料
| 型號(hào)： | HS1101 |
| 廠商： | HUMIREL |
| 元件分類： | 濕度傳感器 |
| 英文描述： | RELATIVE HUMIDITY SENSOR |
| 中文描述： | 濕度傳感器 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 518K |
| 代理商： | HS1101 |
TECHNICAL
DATA
3
F
REQUENCY
O
UTPUT
C
IRCUITS
HPC001 Rev. 7 June 2002
3
7
2
5
6
4
R
TR
CV
TH
DC
Q
IC1
TLC555
R2
576K
R4
49.9K
R3
1K
909K
180p@55%RH
GND
FOUT
3.5 TO 12V
COMMENTS
This circuit is the typical astable design for 555. The HS1100/HS1101, used as varia-
ble capacitor, is connected to the TRIG and THRES pin. Pin 7 is used as a short circuit
pin for resistor R4.
The HS1100/HS1101 equivalent capacitor is charged through R2 and R4 to the
threshold voltage (approximately 0.67Vcc) and discharged through R2 only to the trig-
ger level (approximately 0.33Vcc) since R4 is shorten to ground by pin 7.
Since the charge and discharge of the sensor run through different resistors, R2 and
R4, the duty cycle is determined by :
thigh = C@%RH*(R2+R4)*ln2
tlow= C@%RH*R2*ln2
Output duty cycle = thigh*F = R2/(R4+2*R2)
To provide an output duty cycle close to 50%, R4 should be very low compared to R2
but never under a minimum value.
Resistor R3 is a short circuit protection. 555 must be a CMOS version.
REMARK
R1 unbalances the internal temperature compensation scheme of the
555 in order to introduce a temperature coefficient that matches the
HS1100/HS1101 temperature coefficient. In all cases, R1 should be a 1%
resistor with a maximum of 100ppm coefficient temperature like all
other R-C timer resistors. Since 555 internal temperature compensation
changes from one trademark to one other, R1 value should be adapted
to the specific chip. To keep the nominal frequency of 6660Hz at 55%RH,
R2 also needs slight adjustment as shown in the table.
555 Type
TLC555 (Texas)
TS555 (STM)
7555 (Harris)
LMC555 (National)
909k
576k
523k
549k
562k
100nF capacitor
1732k
1238k
For a frequency of 6660Hz at 55%RH
R1
R2
Typical Characteristics for Frequency Output Circuits
REFERENCE POINT AT 6660Hz FOR 55%RH / 25°C
RH
Frequency
0
7351
7224
7100
6976
6853
6728
6600
6468
6330
6186
6033
10
20
30
40
50
60
70
80
90
100
Typical for a 555 Cmos type. TLC555 (RH : Relative Humidity in %, F : Frequency in Hz)
Polynomial response :
Fmes(Hz)= F55(Hz)(1.1038-1.936810-3*RH+3.011410-6*RH2-3.440310-8*RH3)
Measurement Error
vs
Stray Capacitance
A special attention is required
in order to minimize stray
capacitance
in
The added capacitance will
act as a parallel capacitance
with the sensor and create a
measurement error.
the
layout.
-10
-8
-6
-4
-2
0
2
4
6
8
10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
0
12% RH
33% RH
55% RH
75.5% RH
97.5% RH
Nominal Capacitance : 180pF
Nominal Humidity : 55%RH
Frequency Range : 0kHz to 25kHz
Stray capacitance (pF)
E
BILL OF MATERIAL AVAILABLE ON REQUEST
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HS1101A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HS1101B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HS1101C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| HS1101LF | 功能描述:板上安裝濕度傳感器 -60 to 140 Oper Temp 10 VAC Supply Volt RoHS:否 制造商:Honeywell RH 范圍:10 % to 90 % RH 精度:+/- 4 % 封裝 / 箱體:SOIC-8 輸出類型: 電源電壓-最大:5.5 V 電源電壓-最小:2.3 V 電源電流:0.65 mA 最大工作溫度:+ 85 C 最小工作溫度:- 25 C 安裝風(fēng)格:SMD/SMT |
| HS-1102 | 功能描述:基本/快動(dòng)開關(guān) SEALED SE RoHS:否 制造商:Omron Electronics 觸點(diǎn)形式:SPDT 執(zhí)行器:Lever 電流額定值:5 A 電壓額定值 AC:250 V 電壓額定值 DC:30 V 功率額定值: 工作力:120 g IP 等級(jí):IP 67 NEMA 額定值: 端接類型:Wire 安裝:Panel |
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