CHRONTEL
CH7322B
4
209-0000-095
Rev. 1.2,
6/29/2009
1.2
Pin Description
Table 1: Pin Description
Pin #
Type
Symbol
Description
1
In
AS
Address Select (Internal pull-up)
This pin determines the serial port address of the device (1,1,1,0,1,AS*,
AS).
2
In
SC
Serial Port Clock Input
This pin functions as the clock input of the serial port. This requires an
external 2.2k ohm pull-up resistor. The voltage for logic 1 can be from
1.8V to 5V.
3
In/Out
SD
Serial Port Data Input / Output
This pin functions as the bi-directional data pin of the serial port. This
requires an external 2.2k ohm pull-up resistor. The voltage for logic 1
can be from 1.8V to 5V.
4
In
XI / FIN
Crystal Input / External Reference Input
A parallel resonance crystal can be attached between this pin and XO.
Crystal range is 4 to 50 MHz. However, an external clock can also drive
the XI / FIN input and its range can be from 1 to 100 MHz.
5
Out
XO
Crystal Output
A parallel resonance crystal can be attached between this pin and XI /
FIN. Crystal range is 4 to 50 MHz. However, if an external CMOS
clock is attached to XI / FIN, XO should be left open.
6
In
OE
Output Enable (internal pull-up)
When this pin is low, it will put CH7322B into standby mode.
8
Out
HPDO / INTO
Hot Plug Detect Output / Interrupt Output
This pin serves as an interrupt for device connection status. However
this output pin can be programmed for other usage. Supports CMOS
logic level from 1.8V to 3.3V
10
In
HPDI
Hot Plug Detect Input (internal pull-down)
This pin is used to monitor the Hot Plug detection signal. Refer to
reference schematic for connectivity.
11
In/Out
SD_DDC
Routed Serial Port Data to Port DDC
This pin attaches to DDC Data bus for obtaining the Physical Address
from a receiver. Refer to reference schematic for connectivity.
12
In
SC_DDC
Routed Serial Port Clock to Port DDC
This pin attaches to DDC Clock bus. Refer to reference schematic for
connectivity.
13
In/Out
CEC
CEC data Input / Output
This pin will output CEC Message opcodes specified in HDMI
Specification 1.3a.
14
In
ISET
Current Set Resistor Input.
A 27K-ohm +/- 1% resistor should be connected between this pin and
GND
15
In
RESET*
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.
7
NC
Not connect
16
Power
VDD
Supply Voltage (3.3V)
9
GND
Ground