ch7301c Chrontel, ch7301c Datasheet - Page 3

• Manufacturer Part Number: ch7301c
• Description: Ch7301 Dvi Transmitter
• Manufacturer: Chrontel

CHRONTEL
1.2 Pin Description
201-0000-056
Table 1. Pin Description
64-Pin
LQFP
2
3
4
5
7
8
9
10
13
14
# Pins Type
1
1
1
1
1
1
1
1
1
1
Rev. 1.32,
In
In
In/Out
In/Out
In/Out
In/Out
In
In
In
In/Out
5/24/2005
Symbol
DE
VREF
H
V
GPIO[1] /
HPINT
GPIO[0]
AS
RESET*
SPD
Description
Data Enable
This pin accepts a data enable signal which is high when active video
data is input to the device, and low all other times. The levels are 0 to
DVDDV, and the VREF signal is used as the threshold level. This
input is used by the DVI.
Reference Voltage Input
The VREF pin inputs a reference voltage of DVDDV / 2. The signal
is derived externally through a resistor divider and decoupling
capacitor, and will be used as a reference level for data, sync, data
enable and clock inputs.
Horizontal Sync Input / Output
This pin receives / sends out horizontal sync input from / output to the
graphics controller.
Vertical Sync Input / Output
This pin receives / sends vertical sync input from / output to the
graphics controller.
General Purpose Input - Output[1] /
DVI Detect Output
This pin provides a general purpose I/O controlled via the serial port
bus. The internal pull-up will be to the DVDD supply.
When the GPIO[1] pin is configured as an input, this pin can be used
to output the DVI detect signal (pulls low when a termination change
has been detected on the HPDET input). This is an open drain output.
The output is released through serial port control.
General Purpose Input - Output[0]
(Open drain or internal weak pull-up)
This pin provides a general purpose I/O controlled via the serial port.
Hot Plug Detect (internal pull-down)
This input pin determines whether the DVI is connected to a DVI
monitor. When terminated, the monitor is required to apply a voltage
greater than 2.4 volts. Changes on the status of this pin will be relayed
to the graphics controller via the HPINT or GPIO[1]/HPINT pin
pulling low.
When the HPDET is pulled low, the DVI output driver will be shut
down.
Address Select (Internal pull-up)
This pin determines the serial port address of the device
(1,1,1,0,1,AS*,AS).
Reset * Input (Internal pull-up)
When this pin is low, the device is held in the power-on reset
condition. When this pin is high, reset is controlled through the serial
port register.
Serial Port Data Input / Output
This pin functions as the serial data pin of the serial port interface, and
uses the DVDDV supply.
(Open drain or internal weak pull-up)
CH7301C
3