THCV217_16 Datasheet, PDF (13/35 Pages) THine Electronics, Inc. – V-by-One HS High-speed Video Data Transmitter and Receiver

Lock Detect and Hot-Plug Function
LOCKN and HTPDN of Rx must be connected with those of Tx as in Figure 5.
LOCKN and HTPDN on THCV218 are both open drain outputs. Pull-up resistors are needed at Tx side.
If THCV218 is not active (in the power down mode, powered off, or not connected), THCV218’s HTPDN
turns high-Z, and the pull-up resister at the Tx side makes the HTPDN input of THCV217 high. THCV217 then
enters into the power down mode.
When THCV218 is active, HTPDN is pulled down by THCV218. Then THCV217 starts up and transmits the
“training pattern” for link training.
LOCKN indicates whether THCV218 is in the lock state or not. If THCV218 is not the lock state, LOCKN
turns high-Z. Otherwise (in the lock state), it’s pulled down by THCV218.
THCV217 keeps transmitting the “training pattern” until LOCKN turns low. And then THCV217 starts
transmitting serialized input data.
THCV217
Power supply for HTPDN
(Tx side)
10kΩ
HTPDN
Power supply for LOCKN
(Tx side)
THCV218
10kΩ
LOCKN
Figure 5. Hot-plug and Lock detect scheme
HTPDN connection between THCV217 and THCV218 can be omitted as an application option. In this case,
HTPDN at the Transmitter side should always be taken as Low. See Figure 6.
THCV217
HTPDN
HTPDN
Power supply for LOCKN
(Tx side)
LOCKN
10kΩ
THCV218
Figure 6. HTPDN is not connected scheme
THCV217-THCV218_Rev.2.11_E
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