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參數(shù)資料
| 型號(hào)： | SHT15 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Humidity & Temperature Sensor |
| 中文描述： | 濕度 |
| 文件頁(yè)數(shù)： | 4/9頁(yè) |
| 文件大?。?/td> | 840K |
| 代理商： | SHT15 |
SHT1x / SHT7x Relative Humidity & Temperature Sensor System
wait for data ready
www.sensirion.com
v2.02 July 2004
4/9
Command
MSB
LSB
Checksum
L
a
a
a
a
0
T
0
0
0
Figure 6
Overview of Measurement Sequence (TS = Transmission Start)
2.3 Status Register
Some of the advanced functions of the SHTxx are available
through the status register. The following section gives a
brief overview of these features. A more detailed description
is available in the application note “Status Register”
Status
Reg
Command
a
a
T
B
0 0
0
1 1
0
0
0
Figure 7
Status Register Write
Command
Status
Reg
a
a
T
B
Checksum
a
B
0 0 1 1
0
0
0
1
Figure 8
Status Register Read
Bit Type
7
6
R
Description
reserved
End of Battery (low voltage detection)
‘0’ for Vdd > 2.47
‘1’ for Vdd < 2.47
Default
0
X No default value,
bit
updated after a
measurement
0
0
0
0
off
0 reload
0 12bit RH
14bit Temp.
is
only
5
4
3
2
1
0
R/W
R/W
R/W
reserved
reserved
For Testing only, do not use
Heater
no reload from OTP
’1’ = 8bit RH / 12bit Temperature resolution
’0’ = 12bit RH / 14bit Temperature resolution
Status Register Bits
Table 3
2.3.1 Measurement resolution
The default measurement resolution of 14bit (temperature)
and 12bit (humidity) can be reduced to 12 and 8bit. This is
especially useful in high speed or extreme low power
applications.
2.3.2 End of Battery
The “End of Battery” function detects VDD voltages below
2.47 V. Accuracy is
±
0.05 V
2.3.3 Heater
An on chip heating element can be switched on. It will
increase the temperature of the sensor by 5-15 °C (9-27 °F).
Power consumption will increase by ~8 mA @ 5 V.
Applications:
By comparing temperature and humidity values before and
after switching on the heater, proper functionality of both
sensors can be verified.
In high (>95 %RH) RH environments heating the sensor
element will prevent condensation, improve response
time and accuracy
Warning:
While heated the SHTxx will show higher
temperatures and a lower relative humidity than with no
heating.
2.4 Electrical Characteristics
(1)
VDD=5V, Temperature = 25 °C unless otherwise noted
Parameter
Conditions
Power supply DC
measuring
Supply current
average
sleep
Low level output voltage
High level output voltage
Low level input voltage Negative going
High level input voltage Positive going 80%
Input current on pads
Output peak current
on
Tristated (off)
Table 4
SHTxx DC Characteristics
Mn. Typ. Max. Units
2.4
5
550
2
(2)
28
(3)
0.3
0
75%
0
10
5.5 V
1
20% Vdd
100% Vdd
20% Vdd
100% Vdd
1
4
μ
A
μ
A
μ
A
μ
A
mA
μ
A
F
SCK
SCK frequency
Parameter
Conditions
VDD > 4.5 V
VDD < 4.5 V
Output load 5 pF
Output load 100 pF 30 40 200 ns
100
100
0
SHTxx I/O Signals Characteristics
Mn Typ. Max. Unit
3.5 10
10 MHz
1 MHz
20 ns
T
RFO
DATA fall time
T
CLx
SCK hi/low time
T
V
DATA valid time
T
SU
DATA set up time
T
HO
DATA hold time
T
R
/T
F
SCK rise/fall time
Table 5
ns
ns
ns
ns
ns
250
10
200
SCK
DATA
T
SU
T
F
T
R
T
HO
T
CLH
F
SCK
T
V
Figure 9
Timing Diagram
1)
Parameters are periodically sampled and not 100% tested
With one measurement of 8 bit accuracy without OTP reload per second
With one measurement of 12bit accuracy per second
(2)
(3)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SHT71 | Humidity & Temperature Sensor |
| SHT75 | Humidity & Temperature Sensor |
| SI-10022 | SI-10022 |
| SI-16001 | SI-16001 |
| SI-3150C | Plug-In Relay; Contacts:6PST-4NO/2NC; Coil Voltage DC Max:125V; Contact Carry Current:10A; Coil Resistance:6200ohm; Relay Options:Polycarbonage Covers; Relay Mounting:Plug-In; Leaded Process Compatible:No; Mounting Type:Plug In |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SHT15 | 制造商:Sensirion 功能描述:SENSOR HUMIDITY HIGH ACCURACY |
| SHT15 | 制造商:Sensirion 功能描述:HUMIDITY SENSOR |
| SHT1-500C075DE | 功能描述:線繞電阻器 - 底架安裝 500 AMP SHUNT 75 mV RoHS:否 制造商:Vishay/Dale 電阻:7 Ohms 容差:1 % 功率額定值:100 W 溫度系數(shù):50 PPM / C 系列:RH 工作溫度范圍:- 55 C to + 250 C 尺寸:46.02 mm Dia. x 46.02 mm W x 88.9 mm L x 44.45 mm H 封裝:Bulk 產(chǎn)品:Power Resistors Wirewound Aluminum Housed |
| SHT18R | 制造商:HellermannTyton 功能描述: |
| SHT18R-HS | 制造商:HellermannTyton 功能描述: |
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