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PDF SI7034-A10 Data sheet ( Hoja de datos )
| Número de pieza | SI7034-A10 | |
| Descripción | DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR | |
| Fabricantes | Silicon Laboratories | |
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Si7034-A10
DIGITAL I2C HUMIDITY AND TEMPERATURE SENSOR
Features
Precision Relative Humidity Sensor Low Power Consumption
± 4% RH (max), 0–80% RH
50 nA, standby current
High Accuracy Temperature Sensor Factory-calibrated
±0.4 °C (max), –10 to 85 °C
0 to 100% RH operating range
–40 to +125 °C operating range
Low Voltage Operation
I2C Interface
Integrated on-chip heater
2x2 mm QFN package
Excellent long term stability
Applications
Mobile smartphones and tablets
Consumer electronics
HVAC/R
Respiratory therapy
White goods
Asset and goods tracking
Thermostats/humidistats
Micro-environments/data centers
Indoor weather stations
Ordering Information:
See page 23.
Pin Assignments
Description
The Si7034 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 calibration or software changes required.
The Si7034 is available in a 2x2 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 2x2 mm QFN-6 packages. The Si7034 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.
VDD 1
DNC
6
5 GND
SCL 2
4 SDA
3
DNC
Top View
Patent Protected. Patents pending
Rev. 1.0 8/15
Copyright © 2015 by Silicon Laboratories
Si7034-A10
1 page  
Si7034-A10
Table 2. General Specifications (Continued)
1.67 ≤ VDD ≤ 1.98 V; TA = –40 to +125 °C unless otherwise noted.
Parameter
Conversion Time
Powerup Time
Symbol
tCONV
Test Condition
Normal Mode, RH conversion1
Normal Mode, Temperature conversion1
Fast Mode, parallel Temp and RH conver-
sion2
Fast Mode, additional RH conversion
time4
tPU From VDD ≥ 1.67 V to ready for a
conversion, 25 °C
Min
—
Typ Max Unit
5.8 8.5 ms
3.7 6 ms
0.9 1.5 ms
1.6 2.5 ms
10 15 ms
From VDD ≥ 1.67 V to ready for a
conversion, full temperature range
—
— 50 ms
After issuing a software reset
command
— 1.2 2.0 ms
Notes:
1. In Normal Mode, a temperature conversion is performed first, followed by an RH conversion.
2. In Fast Mode, both a temperature conversion and an RH conversion are initiated at the same time and occur in parallel.
3. Current consumption of RH conversion after the temperature conversion has finished. In Fast Mode, the temperature
conversion finishes before the RH conversion.
4. Additional time for RH conversion after the temperature conversion has finished.
5. No conversion or I2C transaction in progress. Typical values measured at 25 °C.
6. Occurs once during powerup. Duration is <5 msec.
7. 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).
8. IDD after a user register write. Initiating any other subsequent I2C transaction on the same bus (such as a user register
read, starting an RH measurement, or traffic directed at other I2C devices) will transition the device to standby mode.
9. Additional current consumption when HTRE bit enabled.
Table 3. I2C Interface Specifications1
1.67 ≤ VDD ≤ 1.98 V; TA = –40 to +125 °C unless otherwise noted.
Parameter
Symbol
Test Condition
Min Typ Max Unit
Hysteresis
VHYS
High-to-low versus
0.05 x VDD
—
—
V
low-to-high transition
SCLK Frequency2
SCL High Time
SCL Low Time
Start Hold Time
fSCL
tSKH
tSKL
tSTH
— — 400 kHz
0.6 — — µs
1.3 — — µs
0.6 — — µs
Notes:
1. All values are referenced to VIL and/or VIH.
2. Depending on the conversion command, the Si7034 may hold the master during the conversion (clock stretch). At
above 300 kHz SCL, the Si7034 may 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. 1.0
5
5 Page 
Si7034-A10
3. Bill of Materials
Table 8. Typical Application Circuit BOM for Relative Humidity and Temperature Measurement
Reference
R1
R2
C1
U1
Description
Resistor, 10 kΩ, ±5%, 1/16W, 0402
Resistor, 10 kΩ, ±5%, 1/16W, 0402
Capacitor, 0.1 µF, 6.3 V, X7R, 0402
IC, Digital Temperature/humidity Sensor
Mfr Part Number
CR0402-16W-103JT
CR0402-16W-103JT
C0402X7R6R3-104MNP
Si7034-A10-IM
Manufacturer
Venkel
Venkel
Venkel
Silicon Labs
Rev. 1.0
11
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