as2702 austriamicrosystems, as2702 Datasheet
as2702
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as2702 Summary of contents
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... Each slave device AS2702 may interface sensors or 3 actuators. An AS-Interface bus system based on AS2702 may hence link as many as 248 sensors and 186 actuators to a single master unit ...
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... AS2702 – AS-Interface Slave IC Block Diagram CDC LTGP U5R U5R OSC1 OSCIL- RECEIVE LATOR OSC2 RESET threshold IMP_POS IMP_NEG LTGN Figure 1 Block diagram Pin Assignment and Description SOIC 20 SOIC 16 Name Type Pin No. Pin No I/O, digital, pull- I/O, digital, pull- ...
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... AS2702 – AS-Interface Slave IC SOIC 20 SOIC 16 Name Type 14 12 PFAULT I, digital, pull- LED2 I/O, digital, pull- PSTBn I/O, digital, pull- I/O, digital I/O, digital I/O, digital, pull- I/O, digital, pull- Notes: 1 The pull-up structure is a passive high-side current source with a nom. 10µA current. ...
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... AS2702 – AS-Interface Slave IC Pv 0.5 50 SOIC16 Figure 2 Max. acceptable power dissipation relative to ambient temperature Recommended Operating Conditions Symbol Parameter VLTGP Positive supply voltage/dc portion ILTG Supply current consumption OA Ambient temperature FC Quartz frequency Sensitivity against moisture Notes: 1 False-poling protection diode to be inserted between pos. AS-Interface bus line and LTGP-pin. LTGP-pin to be protected furthermore with a voltage clamp between LTGP and LTGN ...
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... AS2702 – AS-Interface Slave IC Buffer Pin CDC An external buffer capacitor with a recommended value of 100nF should be connected to this pin to ensure a sufficiently high input impedance Z at power supply pin LTGP. Voltage at this pin can be as high as VLTGP. Nom. 24V Power Supply Output UOUT The supply output voltage at UOUT is directly derived from VLTGP and regulated to a level with an offset of about -6V relative to VLTGP ...
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... AS2702 – AS-Interface Slave IC Data Port Pins D3, …, D0 and Data Strobe Pin DSTBn Basically data port D3, … designed for bidirectional data transfer out of and into the slave device. Each data port pin is equipped with both a low-side open-drain output stage as well as an input stage to this purpose. ...
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... Parameter Port Pins P3, …, P0 and Parameter Strobe Pin PSTBn (Note that parameter port pins P3, …, P0 are only available on AS2702 package option SOIC 20, not on the SOIC 16 option.) The transfer of data at P3, …, P0 and the supporting strobe action at pin PSTBn takes place similarly as at D3, …, D0 resp. DSTBn. ...
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... AS2702 – AS-Interface Slave IC output, or input depending on the IO-configuration code, written and stored in the slave device. The timing of the data transfer is presented in Figure 4. Strobe signal PSTBn flags and governs the data transfer as follows: a) parameter port is set ‘output’: output data become valid upon the HL-edge of the strobe and will remain so until the next HL-edge, hence during the entire strobe cycle ...
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... AS2702 – AS-Interface Slave IC Symbol Parameter VSCHLT Input threshold voltage VIN Acceptable input voltage @ output off Notes: 1 The passive high-side current-source provides an about constant input current @ 0V <= VIN < hysteresis implemented Though equipped for bidirectional data transfer as D3, …, D0, the parameter port is nevertheless less flexible than the data port. ...
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... Blinking frequency Data Communication Watchdog AS2702 is equipped with a watchdog timer to supervise data communication by monitoring the strobe signals at pins DSTBn and PSTBn parameter or data strobe is not followed by a consecutive strobe within a time period of 50 … 100ms, the watchdog is triggered and initiates a ‘soft’ reset, see section Reset. ...
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... As long as U5R does not drop below 3.75V in this situation, no ‘hard’ reset takes place; however the data communication watchdog will be triggered (unless disabled) and a ‘soft’ reset will result. EEPROM AS2702 has Bits serial interface EEPROM on board to store the slave unit’s address and set-up data in a non-volatile fashion. The EEPROM stores the following data: ...
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... Information Bits: I4, …, I0 (typ. data or parameters) 1 Parity Bit PB AS2702 allows for slaves on the same AS-Interface bus; this requires a slave address extended to 6 bits, hence an extra bit beyond A4, …, A0. Information bit I3 is used as the 6 address bit in this so-called extended address mode called Sel-bit perceived select between A-slave (Sel = 0) and B-slave (Sel = 1) at address location A4, … ...
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... AS2702 – AS-Interface Slave IC Contact Headquarters austriamicrosystems AG A 8141 Schloss Premstätten, Austria Phone: +43 3136 500 0 Fax: +43 3136 525 01 industry.medical@austriamicrosystems.com www.austriamicrosystems.com Sales Offices austriamicrosystems USA, Inc. 8601 Six Forks Road Suite 400 Raleigh, NC 27615, USA Phone: +1 919 676 5292 Fax: +1 509 696 2713 ...