THCV215_16 Datasheet, PDF (9/26 Pages) THine Electronics, Inc. – V-by-One HS High-speed Video Data Transmitter and Receiver

CML Buffer
THCV215
CAVDL
CAVDL
THCV216
50Ω
50Ω
C=75～
200nF
C=75～
200nF
TXn +
Zdiff=100Ω
RXn +
TXn -
n=0,1
RXn -
50Ω
50Ω
CAGND
CML
Transmitter
Vterm ~ 1.3V
CML
Receiver
Figure 5. CML buffer scheme
Lock detect and Hot-plug function
LOCKN and HTPDN are both open drain output from THCV216. Pull-up resistors are needed at THCV215 side
to VDL. See Figure 6.
If THCV216 is not active (power down mode (PDN=L) or powered off), HTPDN is open. Otherwise, HTPDN is
pulled down by THCV216.
HTPDN of THCV215 side is High when THCV216 is not active or the receiver board is not connected. Then
THCV215 enters into the power down mode. When HTPDN transits from High to Low, THCV215 starts up and
transmits training pattern for link training.
LOCKN indicates whether THCV216 is in the lock state or not. If THCV216 is in the unlock state, LOCKN is
open. Otherwise (in the lock state), it’s pulled down by THCV216.
THCV215 keeps transmitting training pattern until LOCKN transits to Low. After training done, THCV216 sinks
current and LOCKN is Low. Then THCV215 starts transmitting normal video pattern.
THCV215
VDL
(THCV215 side)
HTPDN
10kΩ
VDL
(THCV215 side)
LOCKN
10kΩ
THCV216
Figure 6. Hot-plug and Lock detect scheme
THCV215-216_Rev.2.70_E
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