Si7005
D IGITA L I 2 C H UMIDITY AND TEMPERATURE S ENSOR
D
DNC
DNC
DNC
GND
20
19
GND
1
18 DNC
DNC
2
17 DNC
SCL
3
16 DNC
DNC
13 DNC
12
14 DNC
6
11
15 CS
5
DNC
4
GND
SDA
DNC
om
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.
21
Pin Assignments
Micro-environments/data centers
Automotive climate control and
de-fogging
Asset and goods tracking
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Description
Patent protected; patents pending
10
Industrial HVAC/R
Thermostats/humidistats
Respiratory therapy
White goods
See Ordering Guide.
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Applications
Ordering Information
CEXT
during reflow
liquids and
particulates
(hydrophobic/oleophobic)
Excludes
DNC
Protection
22
Low-profile
9
µA during RH conversion
VDD
240
DNC
0 to 100% RH operating range
–40 to +85 °C (GM) or 0 to +70 °C
operating range (FM)
Wide operating voltage range
(2.1 to 3.6 V)
Low Power Consumption
23
ºC accuracy (typical)
±1 ºC accuracy (maximum @ 0 to 70 °C)
24
±0.5
8
7
4.5% RH (maximum @ 0–80% RH)
Temperature Sensor
I2C host interface
Integrated on-chip heater
4x4 mm QFN package
Excellent long term stability
Factory calibrated
Optional factory-installed
cover
DNC
±
GND
Relative Humidity Sensor
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Features
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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.
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The Si7005 is packaged in a 4x4 mm QFN package and is reflow
solderable. The optional factory-installed protective cover offers a lowprofile, 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.
Rev. 1.5 8/16
Copyright © 2016 by Silicon Laboratories
Si7005
Si7005
Functional Block Diagram
MUX
Logic
ADC
Temperature
Sensor
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2
SCL
SDA
CS
Rev. 1.5
I2C pullups may be
integrated in microcontroller
R = 10 k (typ)
PXx
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Si7005
GND
I2C
Serial
IF
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CEXT
32 kHz Osc
Humidity
Sensor
D
NV CAL
VDD
C = 4.7 µF
C = 0.1 µF
VDD
R = 10 k (typ)
VDD
PXy
PXz
Microcontroller
Si7005
TABLE O F C ONTENTS
Section
Page
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1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2. Relative Humidity Sensor Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3. Linearization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4. Temperature Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.5. Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.6. Prolonged Exposure to High Humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7. PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.8. Protecting the Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.9. Bake/Hydrate Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10. Long Term Drift/Aging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5. Host Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.1. I2C Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.2. I2C Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6. Si7005 Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7. Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
7.1. Register Detail (Defaults in Bold) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8. Pin Descriptions: Si7005 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
9. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
10.1. 24-Pin QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10.2. 24-Pin QFN with Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
11. PCB Land Pattern and Solder Mask Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
12.1. Si7005 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
12.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
13. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Rev. 1.5
3
Si7005
1. Electrical Specifications
Unless otherwise specified, all min/max specifications apply over the recommended operating conditions.
Symbol
Parameter
Power Supply
Test Condition
VDD
Min
Typ
Max
Unit
2.1
3.3
3.6
V
85
°C
70
°C
TA
G grade
–40
—
Operating Temperature
TA
F grade
0
—
Table 2. General Specifications
Test Condition
Input Voltage High
VIH
CS, SCL, SDA pins
Input Voltage Low
VIL
CS, SCL, SDA pins
Input Voltage Range
VIN
Output Voltage Low
Typ
Max
Unit
0.7xVDD
—
—
V
—
—
0.3xVDD
V
SCL, SDA pins with respect
to GND
0.0
—
3.6
V
CS, CEXT pin with respect to
GND
0.0
—
VDD
V
IIL
CS, SCL, SDA pins
—
—
±1
µA
VOL
SDA pin; IOL = 8.5 mA;
VDD = 3.3 V
—
—
0.6
V
SDA pin; IOL = 3.5 mA;
VDD = 2.1 V
—
—
0.4
V
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Input Leakage
Min
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Symbol
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2.1 VDD 3.6 V; TA = 0 to 70 °C (F grade) or –40 to 85 °C (G grade) unless otherwise noted.
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Operating Temperature
Parameter
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Table 1. Recommended Operating Conditions
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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.
4
Rev. 1.5
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.
Min
Typ
Max
Unit
IDD
RH conversion in progress
—
240
560
µA
Temperature conversion in
progress
—
320
Average for 1 temperature
and 1 RH conversion /
minute
—
1
CS < VIL; no conversion in
progress; VDD = 3.3 V;
SDA = SCL ≥ VIH
—
CS > VIH
—
—
Power Up Time
565
µA
—
µA
—
µA
—
100
µA
24
31
150
mA
14-bit temperature; 12-bit RH
(Fast = 0)
35
40
13-bit temperature; 11-bit RH
(Fast = 1)
18
21
tCS
From CS < VIL to ready for a
temp/RH conversion
10
15
ms
tPU
From VDD ≥ 2.1V to ready for
a temp/RH conversion
10
15
ms
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Wake Up Time
tCONV
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CS < VIL; no conversion in
progress; VDD = 3.3 V;
SDA = SCL ≥ VIH; HEAT = 1
Conversion Time
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Test Condition
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Power Consumption
Symbol
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Parameter
ms
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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. 1.5
5
Si7005
Table 3. I2C Interface Specifications*
2.1 VDD 3.6 V; TA = 0 to 70 °C (F grade) or –40 to +85 °C (G grade) unless otherwise noted.
Test Condition
Min
Typ
Max
Unit
Hysteresis
VHYS
High-to-low versus low-tohigh transition
0.05 x VDD
—
—
V
SCLK Frequency
fSCL
—
—
400
kHz
SCL high time
tSKH
0.6
—
—
µs
SCL low time
tSKL
1.3
—
—
µs
Start hold time
tSTH
0.6
—
—
µs
Start setup time
tSTS
0.6
—
—
µs
Stop setup time
tSPS
0.6
—
—
µs
Bus free time
tBUF
1.3
—
—
µs
SDA setup time
tDS
100
—
—
ns
SDA hold time
tDH
100
—
—
ns
SDA valid time
tVD;DAT
From SCL low to data valid
—
—
0.9
µs
SDA acknowledge valid time
tVD;ACK
From SCL low to data valid
—
—
0.9
µs
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Symbol
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Between Stop and Start
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Parameter
*Note: All values are referenced to VIL and/or VIH.
tSKH
1/fSCL
D7
tDS
D6
tDH
D5
D0
tSPS
R/W
ACK
R
SDA
tSTH
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tBUF
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SCL
tSKL
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Start Bit
6
Stop Bit
tVD : ACK
tSTS
Figure 1. I2C Interface Timing Diagram
Rev. 1.5
Si7005
Table 4. Humidity Sensor
2.1 VDD 3.6 V; TA = 25 °C; tCONV = 35 ms unless otherwise noted.
Symbol
Operating Range1
Test Condition
Min
Typ
Max
Unit
Non-condensing
0
—
100
%RH
—
—
12
bit
—
±3.0
±4.5
%RH
—
%RH
RMS
Resolution2
Accuracy3,4
20–80% RH
0–100% RH
See Figure 2
—
63%
—
18
—
s
—
±1
—
%RH
—
0.25
—
%RH/yr
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1 m/s airflow
0.05
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Repeatability—Noise
Response Time5
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Parameter
Hysteresis
Long Term Stability4
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Notes:
1. Recommended humidity operating range is 20 to 80% RH (non-condensing) over 0 to 60 °C. Prolonged operation
beyond these ranges may result in a shift of sensor reading, with slow recovery time.
2. The Si7005 has a nominal output of 16 codes per %RH, with 0h0000 = –24%RH.
3. Excludes hysteresis, long term drift, and certain other factors and is applicable to non-condensing environments only.
See section “4.2. Relative Humidity Sensor Accuracy” for more details.
4. May be impacted by dust, vaporized solvents or other contaminants, e.g., out-gassing tapes, adhesives, packaging
materials, etc. See section “4.10. Long Term Drift/Aging”.
5. Time for sensor output to reach 63% of its final value after a step change.
RHAccuracy
Max.RHError(±%)
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8
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6
5
4
R
RHMeasurementError(±%)
9
Typ.RHError(±%)
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2
1
0
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
RelativeHumidity(%)
Figure 2. RH Accuracy at 30 °C
Rev. 1.5
7
Si7005
Table 5. Temperature Sensor
2.1 VDD 3.6 V; TA = 0 to 70 °C (F grade) or –40 to +85 °C (G grade); tCONV = 35 ms unless otherwise noted.
Test Condition
Min
Typ
Max
Unit
–40
—
85
°C
—
—
14
Bit
—
—
1/32
°C
—
±0.5
±1.0
°C
Operating Range
Resolution1
Accuracy2
Typical at 25 °C
Maximum
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Symbol
See Figure 3.
—
0.1
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Repeatability—Noise
Response Time3
Time to reach 63% of final value
Long Term Stability
°C
D
Parameter
—
°C
RMS
—
1.5
—
s
—
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