THCV215_16 Datasheet, PDF (22/26 Pages) THine Electronics, Inc. – V-by-One HS High-speed Video Data Transmitter and Receiver

Note
1)HTPDN/LOCKN connection between high VDD V-by-One^® HS transmitter and THCV216
When using THCV216 with high VDD V-by-One^® HS transmitter, user have to take care of HTPDN/LOCKN
connection because THCV216 HTPDN/LOCKN output pins absolute maximum ratings are VDL+0.3V;
therefore high VDD pull-up at transmitter side can cause violation of usage. Users are supposed to connect
those HTPDN/LOCKN line between two devices with appropriate level-shifter configuration.
V-by-One^®HS Tx side PCB
3.3V
10kΩ
V-by-One^®HS Transmitter
(Ex. THCV217,THCV233)
3.3V
10kΩ
V-by-One^®HS Rx side PCB
1.8V
THCV216
G
10kΩ
DS
MOSFET
(Vth<1.2V)
HTPDN
1.8V
G
10kΩ
DS
MOSFET
(Vth<1.2V)
1.8V Tolerant
Transistor
LOCKN
2)LVDS input pin connection
When LVDS line is not drove from the previous device, the line is pulled up to 3.3V internally in
THCV215.This can cause violation of absolute maximum ratings to the previous LVDS Tx device whose
operating condition is lower voltage power supply than 3.3V. This phenomenon may happen at power on phase
of the whole system including THCV215. One solution for this problem is PD=L control during no LVDS input
period because pull-up resistors are cut off at power down state.
LVDS Tx side PCB
Low VDD
LVDS Tx
or
LVDS Tx
integrated
device
LVDS Rx side PCB
LAVDH
THCV215
LVDS input buffer
Internal circuit of THCV215
3)Power On Sequence
Don’t input TCLK#+/- before power supply to THCV215 is on in order to keep absolute maximum ratings.
4)Unused LVDS input pins
First, select appropriate color depth with COL0,COL1 pins. If there are inevitably remained LVDS no input
pins which are originally active, tie them to GND.
Second, avoid the situation that LVDS input pins in use are open. You can use PDN=L control during no
LVDS input period to cut off pulled-up resistors.
5)Cable Connection and Disconnection
Don’t connect and disconnect CML and LVDS cables, when the power is supplied to the system.
6)GND Connection
Connect the each GND of the PCB which Transmitter, Receiver and THCV215 on it. It is better for EMI
reduction to place GND cable as close to LVDS cable as possible.
THCV215-216_Rev.2.70_E
Copyright(C)2016 THine Electronics, Inc.
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