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HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
HDC1008 Low Power, High Accuracy Digital Humidity Sensor with Temperature Sensor
1 Features 3 Description
The HDC1008 is a digital humidity sensor with
1• Relative Humidity (RH) Operating Range 0% to integrated temperature sensor that provides excellent
100% measurement accuracy at very low power. The
• 14 Bit Measurement Resolution device measures humidity based on a novel
• Relative Humidity Accuracy ±4% capacitive sensor. The humidity and temperature
sensors are factory calibrated. The innovative
• Temperature Accuracy ±0.2 °C WLCSP (Wafer Level Chip Scale Package) simplifies
• 200 nA Sleep Mode Current board design with the use of an ultra-compact
• Average Supply Current: package. The sensing element of the HDC1008 is
placed on the bottom part of the device, which makes
– 820 nA @ 1sps, 11 bit RH Measurement the HDC1008 more robust against dirt, dust, and
– 1.2 µA @ 1sps, 11 bit RH and Temperature other environmental contaminants. The HDC1008 is
Measurement functional within the full -40°C to +125°C temperature
• Supply Voltage 3 V to 5 V range.
• Tiny 2 mm x 1.6 mm Device Footprint Device Information (1)
• I2C Interface PART NUMBER PACKAGE BODY SIZE (NOM)
HDC1008 DSBGA (8-bump) 2.04 mm x 1.59 mm
2 Applications (1) For all available packages, see the orderable addendum at
• HVAC the end of the datasheet.
• Smart Thermostats and Room Monitors
• White Goods
• Printers
• Handheld Meters
• Medical Devices
• Cargo Shipping
• Automotive Windshield Defog
• Wearable Devices
• Mobile Devices
4 Typical Application
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
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Table of Contents
8.4 Device Functional Modes.......................................... 9
1 Features.................................................................. 18.5 Programming........................................................... 10
2 Applications ........................................................... 18.6 Register Map .......................................................... 14
3 Description............................................................. 19 Application and Implementation ........................ 16
4 Typical Application................................................ 19.1 Application Information............................................ 16
5 Revision History..................................................... 29.2 Typical Application ................................................. 16
6 Pin Configuration and Functions......................... 39.3 Do's and Don'ts ...................................................... 18
7 Specifications......................................................... 410 Power Supply Recommendations ..................... 18
7.1 Absolute Maximum Ratings ...................................... 411 Layout................................................................... 19
7.2 ESD Ratings.............................................................. 411.1 Layout Guidelines ................................................. 19
7.3 Recommended Operating Conditions....................... 411.2 Layout Example .................................................... 21
7.4 Thermal Information.................................................. 412 Device and Documentation Support................. 22
7.5 Electrical Characteristics........................................... 512.1 Documentation Support ........................................ 22
7.6 I2C Interface Electrical Characteristics...................... 612.2 Community Resources.......................................... 22
7.7 I2C Interface Timing Requirements ......................... 612.3 Trademarks........................................................... 22
7.8 Typical Characteristics.............................................. 712.4 Electrostatic Discharge Caution............................ 22
8 Detailed Description.............................................. 912.5 Glossary................................................................ 22
8.1 Overview................................................................... 913 Mechanical, Packaging, and Orderable
8.2 Functional Block Diagram......................................... 9Information........................................................... 22
8.3 Feature Description................................................... 9
5 Revision History
Changes from Revision A (November 2014) to Revision B Page
• Deleted references to functional and operating temperature ranges. ................................................................................... 1
• Changed wording to clarify..................................................................................................................................................... 3
• Moved Storage Temperature to Abs Max Rating Table ........................................................................................................ 4
• Changed Handling Ratings table to ESD Ratings table. ....................................................................................................... 4
• Added separate conditions for RH ........................................................................................................................................ 4
• Added RH condition ............................................................................................................................................................... 5
• Added figure reference. ......................................................................................................................................................... 5
• Added condition ..................................................................................................................................................................... 5
• Changed wording to clarify hysteresis definition ................................................................................................................... 5
• Changed recommended operating range .............................................................................................................................. 5
• Changed register reference for supply voltage monitoring. The original reference was incorrect ........................................ 9
• Added recommendation for recovery from soldering. ......................................................................................................... 18
Changes from Original (October 2014) to Revision A Page
• Changed Datasheet's title ...................................................................................................................................................... 1
• Changed description............................................................................................................................................................... 1
• Changed overview ................................................................................................................................................................. 9
• Changed application information.......................................................................................................................................... 16
• Changed recovery from soldering ....................................................................................................................................... 18
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C2C1
B2B1
A2A1
RH
SENSOR
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6 Pin Configuration and Functions
WLCSP (DSBGA)
8 Pin YPA
Top View
Pin Functions
PIN I/O TYPE(1) DESCRIPTION
NAME NO.
SCL A1 I Serial clock line for I2C, open-drain; requires a pull-up resistor to VDD
VDD B1 P Supply Voltage
ADR0 C1 I Address select pin – hardwired to GND or VDD
ADR1 D1 I Address select pin – hardwired to GND or VDD
SDA A2 I/O Serial data line for I2C, open-drain; requires a pull-up resistor to VDD
GND B2 G Ground
DNC C2 - Do Not Connect, or may be connected to GND
DRDYn D2 O Data ready, active low, open-drain, requires a pull-up resistor to VDD. If not used tie to GND.
(1) P=Power, G=Ground, I=Input, O=Output
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7 Specifications
7.1 Absolute Maximum Ratings(1)
MIN MAX UNIT
VDD -0.3 6
SCL -0.3 6
SDA -0.3 6
Input Voltage V
DRDYn -0.3 6
ADR0 -0.3 VDD+0.3
ADR1 -0.3 VDD+0.3
Storage Temperature TSTG(2) -65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) For long term storage, it is recommended to stay within 10%RH-80%RH and +5°C to 60°C. Storage beyond this range may result in a
temporary RH offset shift.
7.2 ESD Ratings VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all ±1000
pins (1) V
Charged device model (CDM), per JEDEC specification –500 500 ±250
JESD22-C101, all pins (2)
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.3 Recommended Operating Conditions
over operating range (unless otherwise noted) MIN NOM MAX UNIT
VDD Supply Voltage 2.7 3 5.5 V
TA, Temperature Ambient Operating Temperature -40 125 °C
Sensor
TA, Humidity Ambient Operating Temperature -20 60 °C
Sensor
7.4 Thermal Information HDC1008
THERMAL METRIC(1) DSBGA (YPA) UNIT
8 PINS
RθJA Junction-to-Ambient Thermal Resistance 98.0 °C/W
(1) For more information about traditional and new thermal metrics, see the: IC Package Thermal Metrics application report, SPRA953.
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7.5 Electrical Characteristics
The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. TA= 30°C,
VDD = 3V, and RH = 40%.
PARAMETER TEST CONDITION MIN TYP MAX UNIT
POWER CONSUMPTION
IDD Supply Current RH measurement, bit 12 of 0x02 register = 180 220 µA
0(1)
Temperature measurement, bit 12 of 0x02 155 185 µA
register = 0(1)
Sleep Mode 110 200 nA
Average @ 1 measurement/second, RH (11 730 nA
bit), bit 12 of 0x02 register = 0(1)(2)
Average @ 1 measurement/second, Temp 580 nA
(11 bit), bit 12 of 0x02 register = 0(1)(2)
Average @ 1 measurement/second, RH 1.2 µA
(11bit) +temperature (11 bit), bit 12 of 0x02
register = 1(1)(2)
Startup (average on Start-up time) 300 µA
IHEAT Heater Current(3) Peak current 7.6 mA
Average @ 1 measurement/second, RH 57 µA
(11bit) +temperature (11 bit), bit 12 of 0x02
register = 1(1)(2)
RELATIVE HUMIDITY SENSOR
RHACC Accuracy Refer to Figure 2 in Typical Characteristics ±4 %RH
section.
RHREP Repeatability(3) 0%RH ±0.1 %RH
RHHYS Hysteresis (4) 20% ≤RH ≤60% ±1 %RH
RHRT Response Time(5) t63%(6) 15 s
RHCT Conversion Time(3) 8 bit resolution 2.50 ms
11 bit resolution 3.85 ms
14 bit resolution 6.50 ms
RHHOR Operating Range(7) Non-condensing 0 100 %RH
RHLTD Long Term Drift ±0.5 %RH/yr
TEMPERATURE SENSOR
TEMPACC Accuracy(3) 5°C < TA< 60°C ±0.2 ±0.4 °C
TEMPREP Repeatability(3) ±0.1 °C
TEMPCT Conversion Time(3) 11 bit accuracy 3.65 ms
14 bit accuracy 6.35 ms
TEMPOR Operating Range -40 125 °C
(1) I2C read/write communication and pull-up resistors current through SCL, SDA and DRDYn not included.
(2) Average current consumption while conversion is in progress.
(3) This parameter is specified by design and/or characterization and it is not tested in production.
(4) The hysteresis value is the difference between an RH measurement in a rising and falling RH environment, at a specific RH point.
(5) Actual response times will vary dependent on system thermal mass and air-flow.
(6) Time for the RH output to change by 63% of the total RH change after a step change in environmental humidity.
(7) Recommended humidity operating range is 20% to 60% RH. Prolonged operation outside this range may result in a measurement
offset. The measurement offset will decrease after operating the sensor in this recommended operating range.
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SCL
SDA
tLOW
tHIGH
START REPEATED
START STOP START
tSP
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7.6 I2C Interface Electrical Characteristics
At TA=30°C, VDD=3V (unless otherwise noted)
PARAMETER TEST CONDITION MIN TYP MAX UNIT
I2C INTERFACE VOLTAGE LEVEL
VIH Input High Voltage 0.7xVDD V
VIL Input Low Voltage 0.3xVDD V
VOL Output Low Voltage Sink current 3mA 0.4 V
HYS Hysteresis (1) 0.1xVDD V
CIN Input Capacitance on all digital pins 0.5 pF
(1) This parameter is specified by design and/or characterization and it is not tested in production.
7.7 I2C Interface Timing Requirements
PARAMETER TEST CONDITION MIN TYP MAX UNIT
I2C INTERFACE VOLTAGE LEVEL
fSCL Clock Frequency 10 400 kHz
tLOW Clock Low Time 1.3 µs
tHIGH Clock High Time 0.6 µs
tSP Pulse width of spikes that must be 50 ns
suppressed by the input filter (1)
tSTART Device Start-up time From VDD ≥2.7 V to ready for a 10 15 ms
conversion(1)(2)
(1) This parameter is specified by design and/or characterization and it is not tested in production.
(2) Within this interval it is not possible to communicate to the device.
Figure 1. I2C Timing
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Vdd (V)
Idd (PA)
2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5
100
125
150
175
200
225
250
275
300 T= -20°C
T= 25°C
T= 40°C
T= 85°C
T= 125°C
Vdd (V)
Idd (PA)
2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5
100
125
150
175
200
225
250
275
300 T= -20°C
T= 25°C
T= 40°C
T= 85°C
T= 125°C
RH (%RH)
Accuracy (r%RH)
0 10 20 30 40 50 60 70 80 90 100
0
2
4
6
8
10 Typical
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7.8 Typical Characteristics
Unless otherwise noted, TA= 30°C, VDD = 3V.
Figure 2. RH Accuracy vs. RH Figure 3. Temperature Accuracy vs. Temperature
Figure 4. Supply Current vs. Supply Voltage, RH Figure 5. Supply Current vs. Temperature, RH Measurement
Measurement
Figure 6. Supply Current vs. Supply Voltage, Temp Figure 7. Supply Current vs. Temperature, Temp
Measurement Measurement
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Vdd (V)
Idd (nA)
2.7 3 3.3 3.6 3.9 4.2 4.5 4.8 5
0
200
400
600
800
1000
1200 T= -20°C
T= 25°C
T= 40°C
T= 85°C
T= 125°C
HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
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Typical Characteristics (continued)
Unless otherwise noted, TA= 30°C, VDD = 3V.
Figure 8. Supply Current vs. Supply Voltage, Sleep Mode Figure 9. Supply Current vs. Temperature, Sleep Mode
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ADR1
ADC
TEMPERATURE
RH
I2C
Registers
+
Logic
HDC1008
SDA
SCL
DRDYn
ADR0
OTP
Calibration Coefficients
VDD
GND
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SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
8 Detailed Description
8.1 Overview
The HDC1008 is a digital humidity sensor with integrated temperature sensor that provides excellent
measurement accuracy at very low power and long term. The sensing element of the HDC1008 is placed on the
bottom part of the device, which makes the HDC1008 more robust against dirt, dust, and other environmental
contaminants. Measurement results can be read out through the I2C compatible interface. Resolution is based on
the measurement time and can be 8, 11, or 14 bits for humidity; 11 or 14 bits for temperature.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Power Consumption
One of the key features of the HDC1008 is its low power consumption, which makes the device suitable in
battery or power harvesting applications. In these applications the HDC1008 spends most of the time in sleep
mode; with a typical 110nA of current consumption in sleep mode, the averaged current consumption is minimal.
Moreover its low consumption in measurement mode minimizes any self-heating.
8.3.2 Voltage Supply Monitoring
The HDC1008 monitors the supply voltage level and indicates when the voltage supply of the HDC1008 is less
than 2.8V. This information is useful in battery-powered systems in order to inform the user to replace the
battery. This is reported in the BTST field (register address 0x02:bit[11]) which is updated after POR and after
each measurement request.
8.3.3 Heater
The heater is an integrated resistive element that can be used to test the sensor or to drive condensation off the
sensor. The heater can be activated using HEAT, bit 13 in Configuration Register. The heater helps in reducing
the accumulated offset after long exposure at high humidity conditions.
Once enabled the heater is turned on only in the measurement mode. To have a reasonable increase of the
temperature it is suggested to increase the measurement data rate.
8.4 Device Functional Modes
The HDC1008 has two modes of operation: sleep mode and measurement mode. After power up, the HDC1008
is in sleep mode. In this mode, the HDC1008 waits for I2C input including commands to configure the conversion
times, read the status of the battery, trigger a measurement, and read measurements. Once it receives a
command to trigger a measurement, the HDC1008 moves from sleep mode to measurement mode. In
measurement mode, the HDC1008 acquires the configured measurements and sets the DRDYn line low when
the measurement is complete. After completing the measurement and setting DRDYn low, the HDC1008 returns
to sleep mode.
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8.5 Programming
8.5.1 I2C Serial Bus Address Configuration
To communicate with the HDC1008, the master must first address slave devices via a slave address byte. The
slave address byte consists of seven address bits and a direction bit that indicates the intent to execute a read or
write operation. The HDC1008 features two address pins to allow up to 4 devices to be addressed on a single
bus. Table 1 describes the pin logic levels used to properly connect up to 4 devices. The state of the ADR0 and
ADR1 pins is sampled on every bus communication and should be set before any activity on the interface
occurs. The address pin is read at the start of each communication event.
Table 1. HDC1008 ADDRESS
ADR1 ADR0 ADDRESS (7-bit address)
0 0 1000000
0 1 1000001
1 0 1000010
1 1 1000011
8.5.2 I2C Interface
The HDC1008 operates only as a slave device on the I2C bus interface. It is not allowed to have on the I2C bus
multiple devices with the same address. Connection to the bus is made via the open-drain I/O lines, SDA, and
SCL. The SDA and SCL pins feature integrated spike-suppression filters and Schmitt triggers to minimize the
effects of input spikes and bus noise. After power-up, the sensor needs at most 15 ms, to be ready to start RH
and temperature measurement. During this power-up time the HDC1008 is only able to provide the content of the
serial number registers (0xFB to 0xFF) if requested. After the power-up the sensor is in the sleep mode until a
communication or measurement is performed. All data bytes are transmitted MSB first.
8.5.2.1 Serial Bus Address
To communicate with the HDC1008, the master must first address slave devices via a slave address byte. The
slave address byte consists of seven address bits, and a direction bit that indicates the intent to execute a read
or write operation.
8.5.2.2 Read and Write Operations
Access a particular register on the HDC1008 by writing the appropriate value to the Pointer Register. The pointer
value is the first byte transferred after the slave address byte with the R/W bit low. Every write operation to the
HDC1008 requires a value for the pointer register (refer to Figure 10).
When reading from the HDC1008, the last value stored in the pointer by a write operation is used to determine
which register is read by a read operation. To change the pointer register for a read operation, a new value must
be written to the pointer. This transaction is accomplished by issuing the slave address byte with the R/W bit low,
followed by the pointer byte. No additional data is required (refer to Figure 11).
The master can then generate a START condition and send the slave address byte with the R/W bit high to
initiate the read command. Note that register bytes are sent MSB first, followed by the LSB. A write operation in
a read-only register such as (DEVICE ID, MANUFACTURER ID, SERIAL ID) returns a NACK after each data
byte; read/write operation to unused address returns a NACK after the pointer; a read/write operation with
incorrect I2C address returns a NACK after the I2C address.
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1 9
Ack by
Slave
Start by
Master
SCL
SDA
Frame 1
7-bit Serial Bus Address Byte
R/W
A2 A0A1A3A4A5A6
D7 D6 D5 D4 D3 D2 D1 D0
1 9
Nack by
Master
Stop by
Master
1 9
D15 D14 D13 D12 D11 D10 D9 D8
Ack by
Master
Frame 4
Data MSB from
Slave
Frame 5
Data LSB from
Slave
1 9
P7 P6 P5 P4 P3 P2 P1 P0
Ack by
Slave
Frame 2
Pointer Register Byte
1 9
Start by
Master
SCL
SDA
Frame 3
7-bit Serial Bus Address Byte
R/W
A2 A0A1
A3A4A5A6
Ack by
Slave
1 9
Ack by
Slave
Start by
Master
SCL
SDA
Frame 1
7-bit Serial Bus Address Byte
R/W
A2 A0A1A3A4A5A6
D7 D6 D5 D4 D3 D2 D1 D0
1 9
Ack by
Slave
Stop by
Master
1 9
D15 D14 D13 D12 D11 D10 D9 D8
Ack by
Slave
Frame 3
Data MSB from
MASTER
Frame 4
Data LSB from
MASTER
1 9
P7 P6 P5 P4 P3 P2 P1 P0
Ack by
Slave
Frame 2
Pointer Register Byte
SCL
SDA
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Figure 10. Writing Frame (Configuration Register)
Figure 11. Reading Frame (Configuration Register)
8.5.2.3 Device Measurement Configuration
By default the HDC1008 will first perform a temperature measurement followed by a humidity measurement. On
power-up, the HDC1008 enters a low power sleep mode and is not actively measuring. Use the following steps
to perform a measurement of both temperature and humidity and then retrieve the results:
1. Configure the acquisition parameters in register address 0x02:
(a) Set the acquisition mode to measure both temperature and humidity by setting Bit[12] to 1.
(b) Set the desired temperature measurement resolution:
– Set Bit[10] to 0 for 14 bit resolution.
– Set Bit[10] to 1 for 11 bit resolution.
(c) Set the desired humidity measurement resolution:
– Set Bit[9:8] to 00 for 14 bit resolution.
– Set Bit[9:8] to 01 for 11 bit resolution.
– Set Bit[9:8] to 10 for 8 bit resolution.
2. Trigger the measurements by executing a pointer write transaction with the address pointer set to 0x00.
Refer to Figure 12.
3. Wait for the measurements to complete, based on the conversion time (refer to Electrical Characteristics for
the conversion time). Alternatively, wait for the assertion of DRDYn.
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1 9
Start by
Master
SCL
SDA
Frame 3
7-bit Serial Bus Address Byte
R/W
A2 A0A1
A3A4A5A6
Nack by
Slave
1 9
Ack by
Slave
Start by
Master
SCL
SDA
Frame 1
7-bit Serial Bus Address Byte
R/W
A2 A0A1
A3A4A5A6
1 9
P7 P6 P5 P4 P3 P2 P1 P0
Ack by
Slave
Frame 2
Pointer Register Byte
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4. Read the output data:
Read the temperature data from register address 0x00, followed by the humidity data from register address
0x01 in a single transaction as shown in Figure 14. A read operation will return a NACK if the contents of the
registers have not been updated as shown in Figure 13.
To perform another acquisition with the same measurement configuration simply repeat steps 2 through 4.
If only a humidity or temperature measurement is desired, the following steps will perform a measurement and
retrieve the result:
1. Configure the acquisition parameters in register address 0x02:
(a) Set the acquisition mode to independently measure temperature or humidity by setting Bit[12] to 0.
(b) For a temperature measurement, set the desired temperature measurement resolution:
– Set Bit[10] to 0 for 14 bit resolution.
– Set Bit[10] to 1 for 11 bit resolution.
(c) For a humidity measurement, set the desired humidity measurement resolution:
– Set Bit[9:8] to 00 for 14 bit resolution.
– Set Bit[9:8] to 01 for 11 bit resolution.
– Set Bit[9:8] to 10 for 8 bit resolution.
2. Trigger the measurement by executing a pointer write transaction. Refer to Figure 12.
– Set the address pointer to 0x00 for a temperature measurement.
– Set the address pointer to 0x01 for a humidity measurement.
3. Wait for the measurement to complete, based on the conversion time (refer to Electrical Characteristics for
the conversion time). Alternatively, wait for the assertion of DRDYn.
4. Read the output data:
Retrieve the completed measurement result from register address 0x00 or 0x01, as appropriate, as shown in
Figure 10. A read operation will return a NACK if the measurement result is not yet available, as shown in
Figure 13.
To perform another acquisition with the same measurement configuration repeat steps 2 through 4.
It is possible to read the output registers (addresses 0x00 and 0x01) during an Temperature or Relative Humidity
measurement without affecting any ongoing measurement. Note that a write to address 0x00 or 0x01 while a
measurement is ongoing will abort the ongoing measurement. If the newest acquired measurement is not read,
DRDYn stays low until the next measurement is triggered.
Figure 12. Trigger Humidity/Temperature Measurement
Figure 13. Read Humidity/Temperature Measurement (Data Not Ready)
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D7 D6 D5 D4 D3 D2 D1 D0
1 9
Ack by
Master
1 9
D15 D14 D13 D12 D11 D10 D9 D8
Ack by
Master
Frame 4
Data MSB from
Slave
Frame 5
Data LSB from
Slave
1 9
Start by
Master
SCL
SDA
Frame 3
7-bit Serial Bus Address Byte
R/W
A2 A0A1A3A4A5A6
Ack by
Slave
SCL
SDA D7 D6 D5 D4 D3 D2 D1 D0
1 9
Nack by
Master
Stop by
Master
1 9
D15 D14 D13 D12 D11 D10 D9 D8
Ack by
Master
Frame 6
Data MSB from
Slave
Frame 7
Data LSB from
Slave
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Figure 14. Read Humidity and Temperature Measurement (Data Ready)
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> @
100%RH*
200:15HUMIDITY
RH)Humidity(% Relative 16 ¸
¹
·
¨
©
§
> @
C40-C165*
200:15ETEMPERATUR
C)e(Temperatur 16 qq
¸
¹
·
¨
©
§
q
HDC1008
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8.6 Register Map
The HDC1008 contains data registers that hold configuration information, temperature and humidity
measurement results, and status information.
Table 2. Register Map
POINTER NAME RESET VALUE DESCRIPTION
0x00 Temperature 0x0000 Temperature measurement output
0x01 Humidity 0x0000 Relative Humidity measurement output
0x02 Configuration 0x1000 HDC1008 configuration and status
0xFB Serial ID device dependent First 2 bytes of the serial ID of the part
0xFC Serial ID device dependent Mid 2 bytes of the serial ID of the part
0xFD Serial ID device dependent Last byte bit of the serial ID of the part
Registers from 0x03 to 0xFA are reserved and should not be written.
The HDC1008 has an 8-bit pointer used to address a given data register. The pointer identifies which of the data
registers should respond to a read or write command on the two-wire bus. This register is set with every write
command. A write command must be issued to set the proper value in the pointer before executing a read
command. The power-on reset (POR) value of the pointer is 0x00, which selects a temperature measurement.
8.6.1 Temperature Register
The temperature register is a 16-bit result register in binary format (the 2 LSBs D1 and D0 are always 0). The
result of the acquisition is always a 14 bit value, while the accuracy is related to the selected conversion time
(refer to Electrical Characteristics). The temperature can be calculated from the output data with:
(1)
Table 3. Temperature Register Description (0x00)
NAME REGISTERS DESCRIPTION
TEMPERATURE [15:02] Temperature Temperature measurement (read only)
[01:00] Reserved Reserved, always 0 (read only)
8.6.2 Humidity Register
The humidity register is a 16-bit result register in binary format (the 2 LSBs D1 and D0 are always 0). The result
of the acquisition is always a 14 bit value, while the accuracy is related to the selected conversion time (refer to
Electrical Characteristics). The humidity can be calculated from the output data with:
(2)
Table 4. Humidity Register Description (0x01)
NAME REGISTERS DESCRIPTION
Relative
HUMIDITY [15:02] Relative Humidity measurement (read only)
Humidity
[01:00] Reserved Reserved, always 0 (read only)
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Product Folder Links: HDC1008
HDC1008
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SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
8.6.3 Configuration Register
This register configures device functionality and returns status.
Table 5. Configuration Register Description (0x02)
NAME REGISTERS DESCRIPTION
RST [15] Software reset 0 Normal Operation, this bit self clears
bit 1 Software Reset
Reserved [14] Reserved 0 Reserved, must be 0
HEAT [13] Heater 0 Heater Disabled
1 Heater Enabled
MODE [12] Mode of 0 Temperature or Humidity is acquired.
acquisition 1 Temperature and Humidity are acquired in sequence, Temperature first.
BTST [11] Battery Status 0 Battery voltage > 2.8V (read only)
1 Battery voltage < 2.8V (read only)
TRES [10] Temperature 0 14 bit
Measurement 1 11 bit
Resolution
HRES [9:8] Humidity 00 14 bit
Measurement 01 11 bit
Resolution 10 8 bit
Reserved [7:0] Reserved 0 Reserved, must be 0
8.6.4 Serial Number Registers
These registers contain a 40bit unique serial number for each individual HDC1008.
Table 6. Serial Number Register Description (0xFB)
NAME REGISTERS DESCRIPTION
SERIAL ID[39:24] [15:0] Serial Id bits Device Serial Number bits from 39 to 24 (read only)
Table 7. Serial Number Register Description (0xFC)
NAME REGISTERS DESCRIPTION
SERIAL ID[23:8] [15:0] Serial Id bits Device Serial Number bits from 23 to 8 (read only)
Table 8. Serial Number Register Description (0xFD)
NAME REGISTERS DESCRIPTION
SERIAL ID[7:0] [15:7] Serial ID bits Device Serial Number bits from 7 to 0 (read only)
[6:0] Reserved Reserved, always 0 (read only)
Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 15
Product Folder Links: HDC1008
Lithium
ion battery
GND
MCU
I2C
Peripheral
ADC
TEMPERATURE
RH
I2C
Registers
+
Logic
HDC1008
SDA
SCL
DRDYn
ADR0
OTP
Calibration Coefficients
ADR1
VDD
GND
VDD
GPIO
- +
GPIO
GPIO
GPIO
GPIO
Temp 29°C
RH 40%
TIME xx:xx
Date xx/xx/xxxx
DISPLAY
Button
ButtonButton
Button
KEYBOARD
GPIO
TO AIRCONDITIONING
SYSTEM
HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
www.ti.com
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
A HVAC or Thermostat are based on environmental sensors and a micro-controller which acquires data from
humidity sensors and temperature sensors and controls the heating/cooling system. The collected data are then
showed on a display that can be easily controlled by the micro controller. Based on data from the humidity and
temperature sensor, the heating/cooling system then maintains the environment at customer-defined preferred
conditions.
9.2 Typical Application
In a battery-powered HVAC or thermostat, one of the key parameters in the selection of components is the
power consumption. The HDC1008, with its 1.2μA of current consumption (average consumption over 1s for RH
and Temperature measurements) in conjunction with an MSP430 represents an excellent choice for the low
power consumption, which extends the battery life. A system block diagram of a battery powered HVAC or
Thermostat is shown in Figure 15.
Figure 15. Typical Application Schematic HVAC
9.2.1 Design Requirements
In order to correctly sense the ambient temperature and humidity, the HDC1008 should be positioned away from
heat sources on the PCB. Generally, it should not be close to the LCD and battery. Moreover, to minimize any
self-heating of the HDC1008 it is recommended to acquire at a maximum sample rate of 1sps (RH + Temp). In
home systems, humidity and the temperature monitoring rates of less than 1sps (even 0.5sps or 0.2sps) can be
still effective.
16 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: HDC1008
Time
RH (%RH)
0:00:00 0:30:00 1:00:00 1:30:00 2:00:00 2:30:00 3:00:00 3:30:00 4:00:00 4:30:00
10
20
30
40
50
60
70
80
90 Temperature 30°C
Ambient (chamber)
HDC1000EVM populated with HDC1008
HDC1008
www.ti.com
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
Typical Application (continued)
9.2.2 Detailed Design Procedure
When a circuit board layout is created from the schematic shown in Figure 15, a small circuit board is possible.
The accuracy of a RH and temperature measurement depends on the sensor accuracy and the setup of the
sensing system. The HDC1008 samples relative humidity and temperature in its immediate environment, it is
therefore important that the local conditions at the sensor match the monitored environment. Use one or more
openings in the physical cover of the HVAC to obtain a good airflow even in static conditions. Refer to the layout
below (Figure 19) for a PCB layout which minimizes the thermal mass of the PCB in the region of the HDC1008,
which can improve measurement response time and accuracy.
9.2.3 Application Curve
The data showed below have been acquired with the HDC1000EVM populated with HDC1008 . The environment
conditions have been evaluated in a humidity chamber.
Figure 16. RH vs. Time
Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 17
Product Folder Links: HDC1008
HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
www.ti.com
9.3 Do's and Don'ts
9.3.1 Soldering
For soldering HDC1008, standard reflow soldering ovens may be used. The sensor is qualified to withstand
soldering profile according to IPC/JEDEC J-STD-020 with peak temperatures at 260 °C. Refer to the document
SNVA009 for more details on the DSBGA package. In the document refer to DSBGA package with bump size
0.5mm pitch and 0.32mm diameter.
When soldering the HDC1008 it is mandatory to use no-clean solder paste and no board wash shall be applied.
The HDC1008 should be limited to a single IR reflow and no rework is recommended.
9.3.2 Hydration Procedure
The HDC1008 may exhibit a negative RH offset due to either the thermal stress of soldering or settling of the RH
sensor. It will slowly settle when the humidity sensor is exposed to ambient conditions. If faster settling is
required, the following hydration process can be used:
Store the PCB containing the HDC1008 at 85% RH and 85 °C for 12 hours.
9.3.3 Chemical Exposure
The humidity sensor is not a standard IC and therefore should not be exposed to volatile chemicals such as
solvents or other organic compounds. If any type of protective coating must be applied to the circuit board, the
sensor must be protected during the coating process.
10 Power Supply Recommendations
The HDC1008 require a voltage supply within 2.7V and 5.5V. A multilayer ceramic bypass X7R capacitor of
0.1µF between VDD and GND pin is recommended.
18 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: HDC1008
()
METAL
0.263 0.05 MAX
SOLDER MASK
OPENING
METAL
UNDER
MASK
()
SOLDER MASK
OPENING
0.263
0.05 MIN
SOLDER MASK DETAILS
NOT TO SCALE
NON-SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK
DEFINED
HDC1008
www.ti.com
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
11 Layout
11.1 Layout Guidelines
The Relative Humidity sensor element is located on the bottom side of the package. It is positioned between the
two rows of bumps.
It is recommended to not route any traces below the sensor element. Moreover, the external components, such
as pull-up resistors and bypass capacitors need to be placed next to the 2 rows of bumps or on the bottom side
of the PCB in order to guarantee a good air flow.
11.1.1 Surface Mount
Two types of PCB land patterns are used for surface mount packages:
1. Non-solder mask defined (NSMD)
2. Solder mask defined (SMD)
Pros and cons of NSMD and SMD:
1. The NSMD configuration is preferred due to its tighter control of the copper etch process and a reduction in
the stress concentration points on the PCB side compared to SMD configuration.
2. A copper layer thickness of less than 1 oz. is recommended to achieve higher solder joint stand-off. A 1 oz.
(35 micron) or greater copper thickness causes a lower effective solder joint stand-off, which may
compromise solder joint reliability.
3. For the NSMD pad geometry, the trace width at the connection to the land pad should not exceed 2/3 of the
pad diameter.
Figure 17. Solder Mask
Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 19
Product Folder Links: HDC1008
(0.5) TYP
(0.5) TYP
8X ( 0.25)
(R ) TYP0.05
METAL
TYP
D
C
12
A
B
SYMM
SYMM
SOLDER PASTE EXAMPLE
BASED ON 0.1mm THICK STENCIL
SCALE:25X
HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
www.ti.com
Layout Guidelines (continued)
11.1.2 Stencil Printing Process
1. Use laser cutting followed by electro-polishing for stencil fabrication.
2. If possible, offset apertures from land pads to maximize separation and minimize possibility of bridging for
DSBGA packages.
3. Use Type 3 (25 to 45 micron particle size range) or finer solder paste for printing.
Figure 18. Solder Paste
20 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: HDC1008
TOP LAYER BOTTOM LAYER
HDC1008
www.ti.com
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
11.2 Layout Example
The only component next to the device is the supply bypass capacitor. Since the relative humidity is dependent
on the temperature, the HDC1008 should be positioned away from hot points present on the board such as
battery, display or micro-controller. Slots around the device can be used to reduce the thermal mass for a quicker
response to environmental changes.
Figure 19. HDC1008 Layout
Copyright © 2014–2015, Texas Instruments Incorporated Submit Documentation Feedback 21
Product Folder Links: HDC1008
HDC1008
SNAS649B –OCTOBER 2014–REVISED DECEMBER 2015
www.ti.com
12 Device and Documentation Support
12.1 Documentation Support
12.1.1 Related Documentation
HDC1000 Texas Instruments Humidity Sensors,SNAA216
AN-1112 Micro SMD Wafer Level Chip Scale Package,SNVA009
12.2 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
12.3 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
12.4 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
12.5 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
22 Submit Documentation Feedback Copyright © 2014–2015, Texas Instruments Incorporated
Product Folder Links: HDC1008
PACKAGE OPTION ADDENDUM
www.ti.com 13-Jun-2017
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status
(1)
Package Type Package
Drawing Pins Package
Qty Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C) Device Marking
(4/5)
Samples
HDC1008YPAR NRND DSBGA YPA 8 3000 Green (RoHS
& no Sb/Br) SAC405 SNAGCU Level-1-260C-UNLIM -40 to 125 GK
HDC1008YPAT NRND DSBGA YPA 8 250 Green (RoHS
& no Sb/Br) SAC405 SNAGCU Level-1-260C-UNLIM -40 to 125 GK
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 13-Jun-2017
Addendum-Page 2
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
HDC1008YPAR DSBGA YPA 8 3000 178.0 8.4 1.68 2.13 0.76 4.0 8.0 Q1
HDC1008YPAT DSBGA YPA 8 250 178.0 8.4 1.68 2.13 0.76 4.0 8.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 19-Dec-2015
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
HDC1008YPAR DSBGA YPA 8 3000 210.0 185.0 35.0
HDC1008YPAT DSBGA YPA 8 250 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 19-Dec-2015
Pack Materials-Page 2
www.ti.com
PACKAGE OUTLINE
C
B E A
D
0.675 MAX
0.265
0.215
1.5
TYP
1
TYP
0.5
TYP
8X 0.335
0.305
4215068/A 11/2013
DSBGA - 0.675 mm max heightYPA0008 DIE SIZE BALL GRID ARRAY
NOTES:
1. All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
BALL A1
CORNER
SEATING PLANE
BALL TYP
C
12
0.005 C A B
A
B
D
SCALE 8.000
D: Max =
E: Max =
2.07 mm, Min =
1.62 mm, Min =
2.01 mm
1.56 mm
www.ti.com
EXAMPLE BOARD LAYOUT
8X 0.275
0.250 (0.5) TYP
(0.5) TYP
()
METAL
0.263 0.05 MAX
SOLDER MASK
OPENING
METAL
UNDER
MASK
()
SOLDER MASK
OPENING
0.263
0.05 MIN
4215068/A 11/2013
DSBGA - 0.675 mm max heightYPA0008 DIE SIZE BALL GRID ARRAY
NOTES: (continued)
3. Final dimensions may vary due to manufacturing tolerance considerations and also routing constraints.
See Texas Instruments Literature No. SBVA017 (www.ti.com/lit/sbva017).
SOLDER MASK DETAILS
NOT TO SCALE
D
C
12
A
BSYMM
SYMM
LAND PATTERN EXAMPLE
SCALE:20X
NON-SOLDER MASK
DEFINED
(PREFERRED) SOLDER MASK
DEFINED
www.ti.com
EXAMPLE STENCIL DESIGN
(0.5) TYP
(0.5) TYP
8X ( 0.25)
(R ) TYP0.05
METAL
TYP
4215068/A 11/2013
DSBGA - 0.675 mm max heightYPA0008 DIE SIZE BALL GRID ARRAY
NOTES: (continued)
4. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release.
D
C
12
A
B
SYMM
SYMM
SOLDER PASTE EXAMPLE
BASED ON 0.1mm THICK STENCIL
SCALE:25X
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