|
|
PDF HTU21DF Data sheet ( Hoja de datos )
| Número de pieza | HTU21DF | |
| Descripción | Digital Relative Humidity sensor | |
| Fabricantes | TE | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HTU21DF (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
HTU21D(F) RH/T SENSOR IC
Digital Relative Humidity sensor with
Temperature output
SPECIFICATIONS
DFN type package
Relative Humidity and Temperature Digital Output, I²C
interface
Fully calibrated
Lead free sensor, reflow solderable
Low power consumption
Fast response time
FEATURES
Full interchangeability with no
calibration required in standard
conditions
Instantaneous desaturation after
long periods in saturation phase
Compatible with automatized
assembly processes, including Pb
free and reflow processes
Individual marking for compliance to
stringent traceability requirements
APPLICATIONS
Home Appliance
Medical
Printers
Humidifier
The HTU21D(F) is a new digital humidity sensor with
temperature output by MEAS. Setting new standards in terms of
size and intelligence, it is embedded in a reflow solderable Dual
Flat No leads (DFN) package with a small 3 x 3 x 0.9 mm
footprint. This sensor provides calibrated, linearized signals in
digital, I²C format.
HTU21D(F) digital humidity sensors are dedicated humidity and
temperature plug and play transducers for OEM applications
where reliable and accurate measurements are needed. Direct
interface with a micro-controller is made possible with the module
for humidity and temperature digital outputs. These low power
sensors are designed for high volume and cost sensitive
applications with tight space constraints.
Every sensor is individually calibrated and tested. Lot
identification is printed on the sensor and an electronic
identification code is stored on the chip – which can be read out
by command. Low battery can be detected and a checksum
improves communication reliability. The resolution of these digital
humidity sensors can be changed by command (8/12bit up to
12/14bit for RH/T).
With MEAS’ improvements and miniaturization of this sensor, the
performance-to-price ratio has been improved – and eventually,
any device should benefit from its cutting edge energy saving
operation mode.
Optional PTFE filter/membrane (F) protects HTU21D digital
humidity sensors against dust and water immersion, as well as
against contamination by particles. PTFE filter/membranes
preserve a high response time. The white PTFE filter/membrane
is directly stuck on the sensor housing. This membrane is
allowing an IP67 compliant protection.
SENSOR SOLUTIONS /// HPC199_6 HTU21D(F)
9/2015
Page 1
1 page  
HTU21D(F) RH/T SENSOR IC
Digital Relative Humidity sensor with Temperature output
(1) Typical values are recommended for calculating energy consumption while maximum values shall be applied for calculating
waiting times in communication.
(2) At 1m/s air flow
GRAPH 2 : TEMPERATURE ERROR BUDGET
2
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-40 -20 0
Maximal Tolerance
Typical Tolerance
20 40 60 80 100 120
Temperature (°C)
USER GUIDE HTU21D(F)
APPLICATION INFORMATION
Soldering instructions: Lead free reflow soldering recommended process
For soldering HTU21D(F) sensor standard reflow soldering ovens may be used.
HTU21D(F) sensor as a humidity sensitive component (as classified by IPC/JEDEC J-STD-020 or equivalent
documented procedure with peak temperature at 260°C during up to 30 seconds for Pb-free assembly in
IR/convection reflow ovens) must be handled in a manner consistent with IPC/JEDEC J-STD-033 or an equivalent
documented procedure. IPC-1601 provides humidity control, handling and packing of PCBs.
The HTU21D(F) s ensor is qualified to withstand one lead free reflow soldering recommended process profile
below according to JEDEC standard.
SENSOR SOLUTIONS /// HPC199_6 HTU21D(F)
9/2015
Page 5
5 Page 
HTU21D(F) RH/T SENSOR IC
Digital Relative Humidity sensor with Temperature output
12345678
9 10 11 12 13 14 15 16 17 18
S 1 0 0 0 0 0 0 0 ACK 1 1 1 0 0 1 0 1 ACK
I²C address + write
Command (see table p.9)
19 20 21 22 23 24 25 26 27
S 1 0 0 0 0 0 0 1 ACK
Measurement
I²C address + read
Hold during measurement
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
0 1 1 1 1 1 0 0 ACK 1 0 0 0 0 0 1 0 ACK
Data (MSB)
Data (LSB)
Status
46 47 48 49 50 51 52 53 54
1 0 0 1 0 1 1 1 NACK P
Checksum
Hold Master communication sequence
12345678
9 10 11 12 13 14 15 16 17 18
S 1 0 0 0 0 0 0 0 ACK 1 1 1 1 0 1 0 1 ACK
I²C address + write
Command (see table p.9)
19 20 21 22 23 24 25 26 27
Measurement
S 1 0 0 0 0 0 0 1 NACK
measuring
I²C address + read
19 20 21 22 23 24 25 26 27
Measurement
S 1 0 0 0 0 0 0 1 ACK
continue measuring
I²C address + read
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
0 1 1 1 1 1 0 0 ACK 1 0 0 0 0 0 1 0 ACK
Data (MSB)
Data (LSB)
Status
46 47 48 49 50 51 52 53 54
1 0 0 1 0 1 1 1 NACK P
Checksum
No Hold Master communication sequence
Grey blocks are controlled by HTU21D(F) sensor.
For Hold Master sequence, bit 45 may be changed to NACK followed by a stop condition to omit checksum
transmission.
For No Hold Master sequence, if measurement is not completed upon “read” command, sensor does not provide
ACK on bit 27 (more of these iterations are possible). If bit 45 is changed to NACK followed by stop condition,
checksum transmission is omitted.
In those examples, the HTU21D(F) sensor output is SRH = ‘0111’1100’1000’0000 (0x7C80). For the calculation of
physical values status bits must be set to ‘0’. Refer to “Conversion of signal outputs” section p.16.
The maximum duration for measurement depends on the type of measurement and resolution chosen. Maximum
values shall be chosen for the communication planning of the MCU. Refer to the table p.4 and p.6 regarding
measuring time specifications.
I²C communication allows for repeated start conditions without closing prior sequence with stop condition.
SENSOR SOLUTIONS /// HPC199_6 HTU21D(F)
9/2015
Page 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet HTU21DF.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HTU21D | Digital Relative Humidity sensor | TE |
| HTU21D | Digital Relative Humidity sensor |  Measurement |
| HTU21DF | Digital Relative Humidity sensor | TE |
| HTU21DF | Digital Relative Humidity sensor | Measurement |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |