SBPH400-3 Ver la hoja de datos (PDF) - STMicroelectronics
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SBPH400-3 Datasheet PDF : 43 Pages
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SBPH400-3
2 Functional Description
2.1 Transmitter and receiver port interface
Figure 2.1 Analog port schematic
Twisted Pair A
Ph ys ical con ne c tio n
de te ction c o m pa rato r
ICD
Con
Tp Bia s d isa ble
+
T pB ia s ’
-
0. 3µf
m in
Strb_ Tx
D rive r
Strb_ Ena ble
Da ta_Rx
R eceiver
+
-
+
-
Arb_A_Rx A rbitr ation
Co m pa ra to rs
+
-
S200
Speed_Rx
S400
Speed_Rx
7 kΩ
+
-
+
-
55Ω
55Ω
7 kΩ
S 20 0 _ref
S4 00 _r ef
Twisted Pair B
VG
T PA
T PA *
S200
Speed_Tx
S400
Speed_Tx
Da ta _T x
Da ta _Enab le
Strb _ Rx
+
-
+
-
Arb _ B_Rx A rb itra tion
C om parators
+
-
C om mon mode speed
s ig na l c u rren t
TPB
5 5Ω
5 5Ω
T PB *
5 kΩ
±5%
250pF
VG
(shared with TPA
and other ports)
Bia s
7 kΩ
7kΩ
+
-
0.8V
T pB ia s de te c tion c o m pa rato r
The SBPH400-3 implements three cable interface transceiver ports. Each port operates
independently from the other ports, under control of the device control logic. Each port
provides two pairs of signals, denoted TPA, TPA#, and TPB, TPB#. Each signal is
implemented using a driver and a receiver connected to a single pin (total of four pins per port).
In various modes, the driver and receiver are enabled, either separately or both at the same
time (for bi-directional signalling).
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