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AN2482 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN2482 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 18 page AN2482 Unisolated AS-interface bus application 11/18 3.3 Un-isolated connection of the PCLT with AS-Interface controller To remove the opto-coupler in lower cost versions, the operation of the PCLT has been extended to fit the AS-Interface application. A precaution is required on its interface with the bus controller: the impedance between the two circuits must be high in order to maintain the isolation. To achieve this isolation impedance level, the PCLT runs in CMOS mode (MOD = VCC) and the buffer operation is extended up to VCC = 12 V. In the application, the VCC voltage is generated with a Zener diode reference fed from the sensor bus. Because of the buffer voltage increase, it becomes possible to insert a high impedance between the PCLT output and the AS-Interface bus controller input. Typically a 100 k Ω resistor is designed while keeping a 5 V CMOS operation on the input of the bus controller. Figure 12. shows the application diagram where the PCLT is connected to the slave bus controller through a 100 k Ω resistor. The logic signal is transmitted with a low level of less than 20% of the VDD supply voltage and a high level of at least 3.5 V. This high level is defined by the voltage drop across the 100 k Ω pull down resistor. (35 µA times 100 kΩ). Figure 12. Un-isolated AS-Interface slave controller unit using the PCLT 10 12V SLAVE AS-I CTRLER V CC 28V 1 PCLT 750Ù 7 14 9 V CCsensor sensor Vreg ASiP ASiN 30V 10 12V SLAVE AS-I CTRLER V CC 28V 1 PCLT 750Ù 7 14 9 V CCsensor sensor Vreg ASiP ASiN 30V |
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