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ASI4U Datasheet(PDF) 46 Page - List of Unclassifed Manufacturers |
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ASI4U Datasheet(HTML) 46 Page - List of Unclassifed Manufacturers |
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46 / 64 page  ASI4U / ASI4U-E / ASI4U-F Spec. 3.0 Compliant Universal AS-I IC Data Sheet April 2, 2012 © 2012 Zentrum Mikroelektronik Dresden AG — Rev. 2.2 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice. 46 of 63 3.9. LED outputs 3.9.1. Slave Mode The ASI4U provides two LED pins for enhanced status indication. LED1 and LED2 both contain NMOS open drain output drivers. In addition, LED2 contains a high voltage high impedance input stage for purposes of the IC production test. For compatibility to A²SI board layouts, where pin number 23 (former U5RD) had to be connected to U5R, the LED2 function is turned OFF by default, keeping LED2 always at high impedance state. This is to protect LED2 against shorting the 5V supply (U5R) to ground. LED2 will be activated if the Enhanced_Status_Indication flag and/or the Dual_LED_Mode flag are set in the E²PROM. In order to comply with the signaling schemes defined in the AS-i Complete Specification a red LED shall be connected to LED1 and a green LED shall be connected to LED2. Direct operation of a Dual LED is also supported but requires the Dual_LED_Mode flag to be set. This is because LED1 and LED2 need to be controlled differently for AS-i compliant Dual LED signaling. Following status indication is supported Table 27: LED status indication Symptom Standard Status Indication Extended Status Indication Note Normal Dual LED Normal Dual LED Power Off No power supply available Normal operation Data communication is established No data exchange The Data_Exchange_Disable flag is still set, prohibiting Data Port communication. IC is waiting for a Write_Parameter request. The Communication Monitor has detected No Data Exchange status or the IC was reset by Watchdog IC Reset. No data exchange (Address = 0) Slave is waiting for address assignment. Data Port communication is not possible. Periphery Fault alternating alternating Periphery Fault signal generated at FID input. Serious Periphery Fault with Reset alternating Data Strobe driven LOW for more than 44µs. The flashing frequency of any flashing status indication is around 2 Hz. green red green green red green gree n red gree n gree n red gree n green red red green red yellow red green red red green red red/ green green red red/ green green red red |
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