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HCA-BARO Series
Miniature amplified barometric pressure sensors
FEATURES * 600...1100 mbar, 800...1100 mbar barometric ranges * Output: 0.25...4.25 V and I2C-bus (SPI and switching outputs optional) * Precision ASIC conditioning * Calibrated and temperature compensated * Miniature SMT or SIL housing * RoHS compliant * Sensortechnics PRO services
SPECIFICATIONS
Maximum ratings Supply voltage VS (optional 2.7 ... 3.3 VDC) Output current Sink Source Proof pressure3 Burst pressure4 4.5 V ... 5.5 VDC
ELECTRICAL CONNECTION
1 mA 1 mA 3000 mbara 5000 mbara
+Vs
1 3 5 8 2
Lead specifications Average preheating temperature gradient 2.5 K/s Soak time ca. 3 min Time above 217C 50 s Time above 230C 40 s Time above 250C 15 s Peak temperature 260C Cooling temperature gradient -3.5 K/s Temperature ranges Compensated Operating Storage Humidity limits (non-condensing) 0 ... +85C -25 ... +85C -40 ... +125C 0 ... 95 %RH
Vout SCL SDA GND
Note:
Pins 5 and 8 (connections for digital I2C-bus) are only available for SMD package (HCA...H)
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HCA-BARO Series
Miniature amplified barometric pressure sensors
PERFORMANCE CHARACTERISTICS
(Vs = 5.0 V, TA = 25 C, analog output signal is ratiometric to VS, digital output signal is not ratiometric to VS, pressure applied to high pressure port)
Characteristics
Operating pressure range Total accuracy (0 ... 85 C)1 Response delay5, 6 A/D resolution D/A resolution Current consumption (no load)7 Output at min. pressure Full scale span (FSS)
2 6
Min.
HCA0611AR... HCA0811AR... 600 800
Typ.
Max.
1100 1100 1.0
Unit
mbara %FSS ms
2 15 11 5 0666 6666 A N A L O G U E P E R F O R M A N C E C H A R A C T E R IS T IC S 0.25 4.00 D IG IT A L P E R F O R M A N C E C H A R A C T E R IS T IC S
bi t mA
Count Hex
Output at min. pressure Full scale span (FSS)
2
V
Specification notes:
1. Total accuracy is the combined error from offset and span calibration, linearity, pressure hysteresis, and temperature effects. Linearity is the measured deviation based on a straight line. Hysteresis is the maximum output difference at any point within the operating pressure range for increasing and decreasing pressure. Calibration errors include the deviation of offset and full scale from nominal values. 2. Full Scale Span (FSS) is the algebraic difference between the output signal for the highest and lowest specified pressure. 3. Proof pressure is the maximum pressure which may be applied without causing durable shifts of the electrical parameters of the sensing element. 4. Burst pressure is the maximum pressure which may be applied without causing damage to the sensing element or leaks to the housing. 5. Max. delay time between pressure change at the pressure die and signal change at the output. 6. The response time depends on the adjusted internal A/D resolution of the sensor. For 15 bit it is typ. 2 ms. Other A/D resolutions and reponse times are available on request. Please contact Sensortechnics for further information. 7. Sensors with lower current consumption are available on request. Please contact Sensortechnics for further information.
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HCA-BARO Series
Miniature amplified barometric pressure sensors
IC BUS Introduction
The HCA-BARO is capable to generate a digital output signal. The device runs a cyclic program, which will store a corrected pressure value with 15 bit resolution about every 1 ms within the output registers of the internal ASIC. In order to use the sensor for digital signal readout, it should be connected to a bidirectional IC-bus. According to the IC-bus specification, the bus is controlled by a master device, which generates the clock signal, controls the bus access and generates START and STOP conditions. The HCA-BARO is designed to work as a slave, hence it will only respond to requests from a master device. DATA valid (D): State of data line represents valid data when, after START condition, data line is stable for duration of HIGH period of clock signal. Data on line must be changed during LOW period of clock signal. There is one clock pulse per bit of data. Acknowledge (A): Data is transferred in pieces of 8 bits (1 byte) on serial bus, MSB first. After each byte receiving device - whether master or slave - is obliged to pull data line LOW as acknowledge for reception of data. Master must generate an extra clock pulse for this purpose. When acknowledge is missed, slave transmitter becomes inactive. It is on master either to send last command again or to generate STOP condition in that case. Slave address: The IC-bus master-slave concept requires a unique address for each device. The HCA-BARO has a preconfigured slave address (1111000xb). By factory programming it is possible to define a secondary slave address additional to the general one. According to IC specification 127 different addresses are available. The sensor will then listen to both slave addresses. After generating a START condition the master sends the address byte containing a 7 bit address followed by a data direction bit (R/W). A "0" indicates a transmission from master to slave (WRITE), a "1" indicates a data request (READ). DATA operation: The HCA-BARO starts to send 2 data bytes containing the current pressure value as a 15 bit information placed in the output registers.
Digital IC interface
The HCA-BARO complies with the following protocol (Fig. 1): Bus not busy: During idle periods both data line (SDA) and clock line (SCL) remain HIGH. START condition (S): HIGH to LOW transition of SDA line while clock (SCL) is HIGH is interpreted as START condition. START conditions are always generated by the master. Each initial request for a pressure value has to begin with a START condition. STOP condition (P): LOW to HIGH transition of SDA line while clock (SCL) is HIGH determines STOP condition. STOP conditions are always generated by the master. More than one request for the current pressure value can be transmitted without generation of intermediate STOP condition.
SCL
SDA
START condition
Data valid
Data allowed to change
STOP condition
1 S Slave Address R/W A
Data Byte 1
A
Data Byte 2
A
Data Byte 1
P
Read out of first pressure value generated by master generated by slave S = START condition A = Acknowledge P = STOP condition
Read out of n pressure values (optional) Data Byte 1 = High Byte (MSB first) Data Byte 2 = Low Byte (LSB last)
Fig. 1:
IC bus protocol
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HCA-BARO Series
Miniature amplified barometric pressure sensors
IC Interface Parameters
Parameter
Input high level Input low level Output low level Pull-up resistor Load capacitance @ SDA Input capacitance @ SDA/SCL SCL clock frequency Bus free time between STOP and START condition Hold time (repeated) START condition, to first clock pulse LOW period of SCL HIGH period of SCL Setup time repeated START condition Data hold time Data setup time Rise time of both SDA and SCL Fall time of both SDA and SCL Setup time for STOP condition
Symbol
Min.
90 0 500
Typ.
Max.
100 10 10 400 10 400
Unit
% of V s pF kHz
C SD A CI2C_IN FSC L tBUF tHD.STA tLOW tHIGH tSU.STA tHD.DAT tSU.DAT tR tF tSU.STO
100* 1.3 0.8 1.3 0.6 1 0 0.2
s
0.3 0.3 0.6
* recommended Note: Sensortechnics recommends communication speeds of at least 100 kHz (max. 400 kHz). Please contact your nearest Sensortechnics sales office for further information.
tSU;DAT SCL SDA
tHD;DAT
tSU;STA tHD;STA
tR
tF
tHIGH SCL SDA
tLOW
tSU;STO tBUF
tHD;STA
Fig. 2:
Timing characteristics
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HCA-BARO Series
Miniature amplified barometric pressure sensors
PHYSICAL DIMENSIONS AND ELECTRICAL CONNECTIONS HCA...G8
Single port
3.70 3 1.90 2.5 6.4 4.3 12.70
Top view
10.70
2
16
Pin
9.50
Connection +Vs GND Vout I / C*
1 2 3 4
10.30 12 34 0.51 2.54 1.90
0.25 1.45
* Internal connection. Do not connect for any reason
10.70 3 4.20
HIGH PRESSURE PORT
third angle projection dimensions in mm
HCA...H8
SMD single port
2.5 6.4 4.3
Top view
12.70
Pin Connection +Vs GND Vout I/C * SC L I/C * SD A
8765
1
2
2 3
16
9.50
4 5 6 7 8
4.06
1.28
1234
10.70
2.54 0.46 HIGH PRESSURE PORT 1.90
* Internal connection. Do not connect for any reason
3.70
3
3 4.20
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third angle projection dimensions in mm 5/6
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HCA-BARO Series
Miniature amplified barometric pressure sensors
ORDERING INFORMATION
Series Options HCA Pressure range 0611 0811 600...1100 mbar 800...1100 mbar Pressure mode A Absolute Calibration R Barometric Housing G* SIL H SMD
* not available with digital output
Porting 8 9 Straight Barbed
Example:
HCA
0611
A
R
H
8
Custom specific mechanical or electronic sensor modifications are widely available: * 3 V power supply * SPI, switching and custom specific outputs * Dual inline packages (DIP) ... etc. Please contact your nearest Sensortechnics sales office for further information.
Sensortechnics PRO services: * Extended guarantee period of 2 years * Custom product modifications and adaptations even for small quantities * Advanced logistics models for supply inventory and short delivery times * Technical support through application engineers on the phone or at your site * Traceability of each sensor through serial numbers on request * No product specification changes without customer notification * No product obsolescence without very early prior notice * Fastest possible technical response for design and QA engineers * Long term product availability for your spares and service needs ... plus other services on request
Sensortechnics reserve the right to make changes to any products herein. Sensortechnics do not assume any liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. E / 11641 / A 6/6
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