SFS01 EvaKit Brochure en
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Thermal mass flow sensor Optimal for demonstration and evaluation of the SFS01 (Silicon Flow Sensor) Benefits & Characteristics Characteristics Measurement from 0 to 200 sccm Detection of flow direction Analog and digital (I2C) connection Automation technology Process and regulation technology Medicinal and biological technology Battery-operated applications in portable devices Illustration and dimensions (in mm) of the SFS chip 1) For exact size see measurements

Technical Sensor Data SFS01 Pneumatic connections: Temperature range: Storage temperature: Pressure load: Up to 1 bar (one-sided on membrane over 10 years) Electrical Sensor Data 5 ± 5% V Supply voltage: Output voltage: Digital connection: 3.3 V I2C (pull up resistors on board) Digital signal: Calibrated signal (up to ±200 sccm) Raw signal (digits) < 1 mA Analog output load: Flow Performance Integrated sensor: The following values are viewed as typical and achieved in laboratory conditions. The gas used was nitrogen. non-aggressive gases (5-95 % rel. humidity, non-condensing) Measurement...

I2C Protocol I2C Protocol Description For integration with a micro-controller, the SFS Demo Board has an I2C-compatible interface which supports both 100 kHz and 400 kHz bit rates. The default I2C slave address is programmed on 0x28 and can be adjusted in the entire 7-bit address range (0x00 to 0x7F). Parameter Hold time (repeated) START Setup time for a repeated START Data hold time Data setup time Setup time for STOP Pulse duration of spikes suppressed by input 50 filter

Reading the data form SFS Demo Board higher bite lower bite higher bite lower bite During normal operation the SFS Demo Board is ready to transmit current calibrated and raw flow’s value. The typical transmission is: Calibrated flow Raw flow value Entering the Command Mode The calibrated flow read from the module is in signed fixed-point integer Q6 format. To convert it to decimal format, the read value has to be divided by 26 = 64. The minimum value is -512, the maximum value is 511.98438. The resolution of each value is 1/26 = 0.015625. The raw value read from the module is in unsigned...

Reading parameters from the module After successful read instruction the module fills the I²C buffer with the selected parameter. All parameters read from the module, except I²C_address, Serial Number and Firmware Revision, are in signed fixed-point long IQ22 format (4 bytes). To convert them to decimal format the read value has to be divided by 222 = 4 194 304. The minimum value is -512, the maximum value is 511.999 999 762. The resolution of each parameter is 1/222 = 0.000 000 238. I²C_address, Serial Number and Firmware Revision parameters are read in unsigned long format. Additionally,...

Reboot After receiving this command, the module reboots. Typical parameter’s read sequence To read parameter(s) form the flash memory please follow steps: 1. 2. 3. 4. 5. 6. 7. Write 0xA0 to the module – start the command mode Wait 1 ms Write 0x00…0x07 to the module – an address of the parameter Wait 1 ms Read 4 bytes from the module If needed repeat steps 3-5 for another parameter Write 0xA1 to the module – exit command mode Typical parameter’s write sequence Write 0xA0 to the module – start the command mode Wait 1 ms Write 0x20…0x25 to the module – an address of the parameter Wait 1 ms...

Order Information SFS01 EvaKit Order code Former order code Additional Documents Application Note: Data sheet: Innovative Sensor Technology IST AG, Stegrütistrasse 14, 9642 Ebnat-Kappel, Switzerland Phone: +41 71 992 01 00 | Fax: +41 71 992 01 99 | Email: info@ist-ag.com | www.ist-ag.com All mechanical dimensions are valid at 25 °C ambient temperature, if not differently indicated • All data except the mechanical dimensions only have information purposes and are not to be understood as assured characteristics • Technical changes without previous announcement as well as mistakes reserved •...