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PDF Si7005 Data sheet ( Hoja de datos )
| Número de pieza | Si7005 | |
| Descripción | DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR | |
| Fabricantes | Silicon Laboratories | |
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Si7005
DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR
Features
Relative Humidity Sensor
I2C host interface
± 4.5% RH (maximum @ 0–80% RH) Integrated on-chip heater
Temperature Sensor
4x4 mm QFN package
±0.5 ºC accuracy (typical)
Excellent long term stability
±1 ºC accuracy (maximum @ 0 to 70 °C)
0 to 100% RH operating range
Factory calibrated
–40 to +85 °C (GM) or 0 to +70 °C
operating range (FM)
Optional factory-installed
cover
Wide operating voltage range
(2.1 to 3.6 V)
Low-profile
Protection during reflow
Excludes liquids and
Low Power Consumption
particulates
240 µA during RH conversion
(hydrophobic/oleophobic)
Applications
Industrial HVAC/R
Thermostats/humidistats
Respiratory therapy
White goods
Micro-environments/data centers
Automotive climate control and
de-fogging
Asset and goods tracking
Description
The Si7005 is a digital relative humidity and temperature sensor. This
monolithic CMOS IC integrates temperature and humidity sensor
elements, an analog-to-digital converter, signal processing, calibration
data, and an I2C host interface. The patented use of industry-standard,
low-K polymeric dielectrics for sensing humidity enables the construction
of a low-power, monolithic CMOS sensor IC with low drift and hysteresis
and excellent long term stability.
Both the temperature and humidity 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 Si7005 is packaged in a 4x4 mm QFN package and is reflow
solderable. The optional factory-installed protective 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 Si7005 offers an accurate, low-power, factory-calibrated digital
solution ideal for measuring temperature, humidity, and dew-point in
applications ranging from HVAC/R and asset tracking to industrial and
consumer platforms.
Ordering Information
See Ordering Guide.
Patent protected; patents pending
Pin Assignments
GND
DNC
1
2
SCL 3
SDA 4
DNC 5
DNC 6
18 DNC
17 DNC
16 DNC
15 CS
14 DNC
13 DNC
Rev. 1.4 1/16
Copyright © 2016 by Silicon Laboratories
Si7005
1 page  
Si7005
Table 2. General Specifications (Continued)
2.1 VDD 3.6 V; TA = 0 to 70 °C (F grade) or –40 to 85 °C (G grade) unless otherwise noted.
Parameter
Symbol
Test Condition
Min
Typ
Max
Unit
Power Consumption
IDD
RH conversion in progress
—
240 560
µA
Temperature conversion in
progress
—
320 565
µA
Average for 1 temperature
—
1
— µA
and 1 RH conversion /
minute
Conversion Time
tCONV
CS < VIL; no conversion in
progress; VDD = 3.3 V;
SDA = SCL ≥ VIH
CS > VIH
CS < VIL; no conversion in
progress; VDD = 3.3 V;
SDA = SCL ≥ VIH; HEAT = 1
14-bit temperature; 12-bit RH
(Fast = 0)
13-bit temperature; 11-bit RH
(Fast = 1)
—
—
—
150 — µA
— 100 µA
24 31
mA
35 40
ms
18 21
Wake Up Time
Power Up Time
tCS From CS < VIL to ready for a
temp/RH conversion
tPU From VDD ≥ 2.1V to ready for
a temp/RH conversion
10 15 ms
10 15 ms
Notes:
1. Si7005 can draw excess current if VDD and CS are ramped high together. To enter the lowest power mode, either hold
CS low while VDD ramps or pulse CS low after VDD reaches its final value.
2. SDA and SCL pins have an internal 75 k pull-up resistor to VDD.
Rev. 1.4
5
5 Page 
Si7005
3. Bill of Materials
Table 8. Typical Application Circuit BOM
Reference
Description
Mfr Part Number
Manufacturer
C1
Capacitor, 4.7 µF, 6.3 V, X5R, 0603
C0603X5R6R3-475M
Venkel
C2
Capacitor, 0.1 µF, 6.3 V, X7R, 0603
C0603X7R6R3-104M
Venkel
R1*
Resistor, 10 k, ±5%, 1/16W, 0603
CR0603-16W-1002J
Venkel
R2*
Resistor, 10 k, ±5%, 1/16W, 0603
CR0603-16W-1002J
Venkel
U1 IC, digital temperature/humidity sensor
Si7005
Silicon Labs
*Note: Typical value shown. Optimal value depends on bus capacitance and speed of bus operation; not needed if present
elsewhere in the system.
Table 9. Typical Application Circuit for Battery-Powered Applications BOM
Reference
Description
Mfr Part Number
Manufacturer
C1
Capacitor, 4.7 µF, 6.3 V, X5R, 0805
C0805X5R160-475M
Venkel
C2
Capacitor, 0.1 µF, 6.3 V, X7R, 0603
C0603X7R6R3-104M
Venkel
R1*
Resistor, 10 k, ±5%, 1/16W, 0603
CR0603-16W-1002J
Venkel
R2*
Resistor, 10 k, ±5%, 1/16W, 0603
CR0603-16W-1002J
Venkel
R3
Resistor, 15 , ±5%, 1/16W, 0603
CR0603-16W-15R0J
Venkel
U1 IC, digital temperature/humidity sensor
Si7005
Silicon Labs
*Note: Typical value shown. Optimal value depends on bus capacitance and speed of bus operation; not needed if present
elsewhere in the system.
Rev. 1.4
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet Si7005.PDF ] | |
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