AS2702 AS-Interface Slave IC DATA SHEET General Description Key Features AS2702 (SAP4.1) is a new generation AS-Interface slave Interface device to connect actuators and sensors to device, which supports AS-Interface bus systems with up to an AS-Interface bus 62 slave modules. Flexible system solution offering 2 package options: SOIC 20 for full functionality Each slave module is equipped with an AS2702 device, SOIC 16 for applications not requiring the which interfaces the module to the unshielded 2-wire AS- parameter port Interface bus for serial bidirectional data communication DC power extraction from the AS-Interface bus and power extraction. Serial bidir. data communication with the bus Data communication watchdog Data communication over the AS-Interface takes place in 4-bit bidir. data port plus strobe to poll the sensors and master slave fashion, which foresees that all slave devices control the actuators connected AS2702 connected to the bus are sequentially and cyclicly 4-bit parameter port plus strobe to provide settings to addressed by a single, central master unit. Data on the AS- the sensors and actuators Interface bus are Manchester encoded and can be found as 24V power supply for the sensors and actuators sin2-pulses with a Vpp of between 3V and 8V on top of the Periphery fault input to signal hardware failure of the bus dc voltage of nominally 30V. sensors and actuators Integrated 16 x 8 bit EEPROM to store (5 + 1)-bit slave AS2702 regulates the nominal dc bus voltage of 30V address and settings internally down to 5V to supply its internal circuitry 2 LED outputs to optically flag slave unit operation including a 16 x 8 bits EEPROM, as well as down to a status nominal supply level 24V with a max. loading of 35mA for Operating temperature Ta: the actuators and sensors connected to it at the field side. - 25C + 85C Operating supply voltage/bus DC voltage: Each slave device AS2702 may interface to up to 4 sensors typ. 30V or 3 actuators. An AS-Interface bus system based on Operating current (Osc. on, outputs idle): AS2702 may hence link as many as 248 sensors and 186 6mA actuators to a single master unit. Supply for sensors/actuators: typ. 24V, 35mA Slave device AS2702 (SAP4.1) is system compatible with predecessor device AS2701A (ISA3+): slave modules equipped with AS2702 (SAP4.1) will run in existing AS-Interface bus systems based on AS2701A (ISA3+). The AS-Interface concept is well established as a standardized digital bus system for industrial automation. Revision 1.3, 21-Aug-08 Page 1 of 13 AS2702 AS-Interface Slave IC Block Diagram CDC LTGP V -6V + LTGP UOUT - THERMO- DETECTOR U5R U5R U5R U5R OSC1 OSCIL- RECEIVE TRANSMIT LATOR JABBER OSC2 INHIBIT RESET threshold 11 U5R IMP POS IMP NEG LOGIC BLOCK LTGN POR BANDGAP + U5R - 16 x 8 BIT 2 SERIAL E PROM 4 4 TRIMMING Figure 1 Block diagram Pin Assignment and Description SOIC 20 SOIC 16 Name Type Note Description Pin No. Pin No. 1 - P1 I/O, digital, pull-up 1, 2 Bidir. parameter port bit 1 2 - P0 I/O, digital, pull-up 1, 2 Bidir. parameter port bit 0 3 1 D1 I/O, digital Bidir. data port bit 1 4 2 D0 I/O, digital Bidir. data port bit 0 5 3 DSTBn I/O, digital, pull-up 1 Data port strobe output reset-input 6 4 LED1 I/O, digital, pull-up 1 LED output 1 (IC test input) 7 5 OSC2 O, analog Output to quartz crystal 8 6 OSC1 I, analog Input from quartz crystal 9 7 U5R O, power Nom. 5V power supply output 10 8 LTGN I, power Neg. supply pin, connected to neg. AS-Interface bus line, ground reference 11 9 LTGP I, power Pos. supply pin, connected to pos. AS-Interface bus line 12 10 CDC I/O, analog Pin for ext. buffer capacitor 13 11 UOUT O, power Nom. 24V power supply output Revision 1.3, 21-Aug-08 Page 2 of 13 LED2 LED1 PFAULT SDA SCL D0...D3 DSTBn P0...P3 PSTBn