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STM7E1A bảng dữ liệu(PDF) 5 Page - STMicroelectronics |
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STM7E1A bảng dữ liệu(HTML) 5 Page - STMicroelectronics |
5 / 10 page STM7E1A 5/10 DECODING OF FUNCTIONAL MODE 1 (MODE = L) When closing the main port local loop (Lm high), it is external system responsibility to ensure that the main port has previously been disconnected from the line (Sc has to be high). There is no internal mechanism to ensure this. When closing the spare port local loop (Ls high), it is external system responsibility to ensure that the spare port has previously been disconnected from the line (Sc has to be high). There is no internal mechanism to ensure this. DECODING OF FUNCTIONAL MODE 2 (MODE = H) C = Closed O=Open C = Closed O=Open TEST MODE DESCRIPTION (MODE = 0, TEST = 1) In order to test the main switches (4-point measurement), test modes are foreseen where the main switches can be controlled independently from each other. One can enter in test mode by controlling the Sc, Lm and Ls pins according to the following table. The digital part and auxiliary switches can be tested in functional mode. Note 1: Although there is an internal pull down in the TEST pin, an external hardware connection from TEST to GND is required on the board to work in functional, mode. Main Switches Sc low a closed, b open Main port is connected to the line Sc high a open, b closed Spare port is connected to the line Auxiliary Switches Lm low d open Main port local loop open Lm high d closed Main port local loop closed Ls low c open Spare port local loop open Ls high c closed Spare port local loop closed INPUT OUTPUTS TEST/Sn A_TX B_TX LO C HC O INPUTS OUTPUTS Sc Lm Ls A_RX B_RX c d LLL C C O O L L HC OC O LHL O C O C L HHC O O O H L L OCOO Signification Sc Lm Ls A_TX closed H H L A_RX closed L H L B_TX closed H L H B_RX closed L L H B_TX & c closed H L L A_RX & d closed L L L All main switches open HH H LH H |
Số phần tương tự - STM7E1A |
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Mô tả tương tự - STM7E1A |
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