THine Electronics, Inc.
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THCV220_Rev.2.20_E
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Color Depth and Frequency Range Select function
THCV220 support a variety of data width and frequency range. Refer to Table 2 for details.
Table 2. operation mode select
Hot-Plug Function
HTPDN indicates connecting condition between the Transmitter and the Receiver. HTPDN of the transmitter
side is high when the Receiver is not active or not connected. Then Transmitter can enter into the power down
mode. HTPDN is set to Low by the Receiver when Receiver is active and connects to the Transmitter, and then
Transmitter must start up and transmit CDR training pattern for link training. HTPDN is open drain output at the
receiver side. Pull-up resistor is needed at the transmitter side.
HTPDN connection between the Transmitter and the Receiver can be omitted as an application option. In this
case, HTPDN at the Transmitter side should always be taken as Low.
Lock Detect Function
LOCKN indicates whether the CDR PLL is in the lock state or not. LOCKN at the Transmitter input is set to
High by pull-up resistor when Receiver is not active or at the CDR PLL training state. LOCKN is set to Low by
the Receiver when CDR lock is done. Then the CDR training mode finishes and Transmitter shifts to the normal
mode. LOCKN is open drain output at the receiver side. Pull-up resistor is needed at the transmitter side.
When HTPDN is included in an application, the LOCKN signal should only be considered when the HTPDN is
pulled low by the Receiver.
Vcc
(Tx side)
HTPDN
LOCKN
10kΩ
HTPDN
LOCKN
THCV220
10kΩ
Vcc
(Tx side)
HTPDN
LOCKN
HTPDN
LOCKN
THCV220
10kΩ
With HTPDN connect Without HTPDN connect
V-by-One®
HS Tx
V-by-One®
HS Tx
Figure 4. Hot-plug and Lock detect scheme
