|
|
PDF SI7021-A20 Data sheet ( Hoja de datos )
| Número de pieza | SI7021-A20 | |
| Descripción | I2C HUMIDITY AND TEMPERATURE SENSOR | |
| Fabricantes | Silicon Laboratories | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SI7021-A20 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
Si7021-A20
I2C HUMIDITY AND TEMPERATURE SENSOR
Features
Precision Relative Humidity Sensor Factory-calibrated
± 3% RH (max), 0–80% RH
I2C Interface
High Accuracy Temperature Sensor Integrated on-chip heater
±0.4 °C (max), –10 to 85 °C
3x3 mm DFN Package
0 to 100% RH operating range
Excellent long term stability
Up to –40 to +125 °C operating
Optional factory-installed cover
range
Low-profile
Wide operating voltage
(1.9 to 3.6 V)
Low Power Consumption
Protection during reflow
Excludes liquids and particulates
150 µA active current
60 nA standby current
Ordering Information:
See page 29.
Applications
HVAC/R
Thermostats/humidistats
Respiratory therapy
White goods
Indoor weather stations
Micro-environments/data centers
Automotive climate control and
defogging
Asset and goods tracking
Mobile phones and tablets
Description
The Si7021 I2C Humidity and Temperature Sensor is a monolithic CMOS IC
integrating humidity and temperature sensor elements, an analog-to-digital
converter, signal processing, calibration data, and an I2C Interface. The patented
use of industry-standard, low-K polymeric dielectrics for sensing humidity enables
the construction of low-power, monolithic CMOS Sensor ICs with low drift and
hysteresis, and excellent long term stability.
The humidity and temperature sensors are factory-calibrated and the calibration
data is stored in the on-chip non-volatile memory. This ensures that the sensors
are fully interchangeable, with no recalibration or software changes required.
The Si7021 is available in a 3x3 mm DFN package and is reflow solderable. It can
be used as a hardware- and software-compatible drop-in upgrade for existing RH/
temperature sensors in 3x3 mm DFN-6 packages, featuring precision sensing
over a wider range and lower power consumption. The optional factory-installed
cover offers a low profile, convenient means of protecting the sensor during
assembly (e.g., reflow soldering) and throughout the life of the product, excluding
liquids (hydrophobic/oleophobic) and particulates.
The Si7021 offers an accurate, low-power, factory-calibrated digital solution ideal
for measuring humidity, dew-point, and temperature, in applications ranging from
HVAC/R and asset tracking to industrial and consumer platforms.
Pin Assignments
Top View
SDA 1
GND 2
DNC 3
6 SCL
5 VDD
4 DNC
Patent Protected. Patents pending
Rev. 1.2 8/16
Copyright © 2016 by Silicon Laboratories
Si7021-A20
1 page  
Si7021-A20
Table 2. General Specifications (Continued)
1.9 < VDD < 3.6 V; TA = –40 to 85 °C (G grade) or –40 to 125 °C (I/Y grade); default conversion time unless otherwise noted.
Parameter
Conversion Time1
Powerup Time
Symbol
tCONV
tPU
Test Condition
12-bit RH
11-bit RH
10-bit RH
8-bit RH
14-bit temperature
13-bit temperature
12-bit temperature
11-bit temperature
From VDD ≥ 1.9 V to ready for a
conversion, 25 °C
From VDD ≥ 1.9 V to ready for a
conversion, full temperature range
After issuing a software reset
command
Min
—
—
—
—
—
—
—
—
—
—
—
Typ Max Unit
10 12
5.8 7
3.7 4.5
2.6 3.1
ms
7 10.8
4 6.2
2.4 3.8
1.5 2.4
18 25
— 80 ms
5 15
Notes:
1. Initiating a RH measurement will also automatically initiate a temperature measurement. The total conversion time will
2.
be
No
tcCoOnNvVe(rRsHio)n+otrCIO2CNVt(rTan).saction
in
progress.
Typical
values
measured
at
25
°C.
3. Occurs once during powerup. Duration is <5 msec.
4. Occurs during I2C commands for Reset, Read/Write User Registers, Read EID, and Read Firmware Version. Duration is
<100 µs when I2C clock speed is >100 kHz (>200 kHz for 2-byte commands).
5. Additional current consumption when HTRE bit enabled. See Section “5.5. Heater” for more information.
Table 3. I2C Interface Specifications1
1.9 VDD 3.6 V; TA = –40 to +85 °C (G grade) or –40 to +125 °C (I/Y grade) unless otherwise noted.
Parameter
Symbol
Test Condition
Min Typ Max Unit
Hysteresis
VHYS High-to-low versus low-to- 0.05 x VDD — — V
high transition
SCLK Frequency2
SCL High Time
SCL Low Time
Start Hold Time
Start Setup Time
fSCL
tSKH
tSKL
tSTH
tSTS
— — 400 kHz
0.6 — — µs
1.3 — — µs
0.6 — — µs
0.6 — — µs
Notes:
1. All values are referenced to VIL and/or VIH.
2. Depending on the conversion command, the Si7021 may hold the master during the conversion (clock stretch). At
above 100 kHz SCL, the Si7021 may also hold the master briefly for user register and device ID transactions. At the
highest I2C speed of 400 kHz the stretching will be <50 µs.
3. Pulses up to and including 50 ns will be suppressed.
Rev. 1.2
5
5 Page 
Si7021-A20
2. Typical Application Circuits
The primary function of the Si7021 is to measure relative humidity and temperature. Figure 4 demonstrates the
typical application circuit to achieve these functions.
1.9 to 3.6V
0.1µF
5
VDD
SCL
6
Si7021 SDA 1
GND
2
10k 10k
SCL
SDA
Figure 4. Typical Application Circuit for Relative Humidity and Temperature Measurement
Rev. 1.2
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SI7021-A20.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SI7021-A20 | I2C HUMIDITY AND TEMPERATURE SENSOR | Silicon Laboratories |
| 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 |