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STM7E1A bảng dữ liệu(PDF) 5 Page - STMicroelectronics

tên linh kiện STM7E1A
Giải thích chi tiết về linh kiện  7 E 1 CHANNELS SWITCH ARRAY
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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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


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