ASF1400 SENSIRION, ASF1400 Datasheet
ASF1400
Specifications of ASF1400
Related parts for ASF1400
ASF1400 Summary of contents
Page 1
... MASS FLOW CMOSens™ SENSOR CHIP MASS FLOW Figure 1: Block Diagram ASF1400 Mass Flow Sensor with CMOSens www.sensirion.com Sensirion AG, Laubisrütistrasse 50, CH-8712 Stäfa ZH, Switzerland, Phone: +41 1 306 40 00, Fax: +41 1 306 40 30 Version 2.1 / May 2005 Mounted in rugged, chemically inert PBT housing the ASF1400 is suitable for a wide range of applications ...
Page 2
... Both mass flow and temperature data are accessed through an RS-232 or SPI interface. The RS-232 interface allows you to directly connect the ASF1400 device PDA using standard terminal software. The serial peripheral interface (SPI) also enables the ASF1400 to be used in smaller systems special interface such as 4-20 mA current output or other is required contact Sensirion for a customer specific solution ...
Page 3
... ASF1400 Bidirectional Mass Flow Meter 1 Mass Flow Sensor Performance Table 1: Overview of ASF1400 Gas Sensor Performance Parameter Condition Flow Sensor direct measurement Dynamic Range using proposed bypass tube customized bypass tube Resolution 400 sccm flow < 10 sccm flow Lowest Detectable < 10 sccm flow ...
Page 4
... However, there is a well defined relation between mass flow and pressure drop. This relation is shown in Figure 4. On request the ASF1400 can also be calibrated for the pressure drop at its output (for more details refer to the documentation of the Sensirion Differential Pressure Sensor ASP1400). ...
Page 5
... ASF1400 can be set using its RS-232 interface). To communicate with the ASF1400 via RS-232 the following pins are required: RxD (Receiving Data Line) TxD (Transmitting Data Line) GND (Ground) The RS-232 of the ASF1400 is configured as follows: Baudrate 9600 Data Bits 8 Stop Bits 1 Parity none ...
Page 6
... In this case, as soon as the measurement data is ready, it appears on the MOSI pin. MOSI (Master Out Slave In, Output) MOSI is the serial data output of the ASF1400 device. Data is clocked out on the rising edge SCK with MSB first. This output goes into a high-impedance state when the device is not selected. ...
Page 7
... ASF1400 Bidirectional Mass Flow Meter • In order to send a new command to the ASF1400 make sure the ASF1400 is not in measurement mode. Issue therefore a stop command s first. After this, any instruction can be given to the ASF1400 and a new series of measurement can be started by go↵. • Due to the limited write cycles allowed for the EEPROM, excessive configuration modifications should be avoided. ...
Page 8
... ASF1400 Bidirectional Mass Flow Meter Table 5: ASF1400 SPI Characteristics (refer to Figure 9 for a timing diagram). Symbol Parameter Vol Output Low Voltage Voh Output High Voltage Vol Output Low Voltage Voh Output High Voltage Ioh Output High Current Iol Output Low Current fop ...
Page 9
... ASF1400 Bidirectional Mass Flow Meter 4.3 SPI Push-Mode Detailed Description The subsequent scope diagrams further describe the ASF1400 device SPI mode data access protocol in PUSH mode SCK Serial clock output 2 = /CS Chip select (Push-Mode MOSI Serial data output Complete read cycle (three bytes) First byte Figure 10: Sample for SPI read cycle of the ASF1400 in Push Mode ...
Page 10
... Ordering Information For small ordering quantities the ASF1400 sensor can be ordered directly at Farnell on http://www.farnell.com. Farnell is a worldwide distributor of electrical, electronic and industrial component products. When ordering ASF1400 series devices at SENSIRION please refer to the following part numbers. For the latest product information access SENSIRION’ ...
Page 11
... SENSIRION AG reserves the right, without further notice, to change the SENSIRION ASF1400 Mass FCC and CE Statement The ASF1400 product has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules (FCC CFR 47). These limits are designed to provide reasonable protection against harmful interference in a residential installation ...