Features General Description

• Complies with Consumer Electronic Control (CEC)

version 1.3a

• Less than 10mA in full operation conditions

• Fully programmable through a two-wire serial port

• Programmable power management

• Auto Mode Technology † Supports mandatory CEC

functions such as One Touch Play, Power Status etc.

without software programming

• Capable of supporting full CEC features by accessing

internal registers.

• Report CEC events through an interrupt and registers

• Flexible crystal frequency input between 4 and 50

MHz or external CMOS clock ranging from 1 to

100Mhz

• DDC master to obtain Physical Address

• Serial Port voltage supported from 1.8V to 5V

• Single 3.3V voltage supply

• Adjustable interrupt voltage level from 1.8V to 3.3V

• HBM up to 8KV ESD protection

• Offered in 16-pin, lead-free SSOP and QFN packages

Applications

• DVD Players

• DVD Recorders

• Digital Video Cameras

• Personal Computers

• A/V Receivers

• Digital Set-top Boxes

Chrontel’s CH7322B is a low cost, low-power

semiconductor device designed for HDMI systems to

easily enable Consumer Electronic Control (CEC)

features, which allow consumers to manage all of their

HDMI CEC peripherals with just one remote control.

The device’s innovative approach for handling CEC

message frame can help our customers to achieve their

required HDMI-CEC features without programming

complicated and time-consuming CEC functions using

microcontroller.

To reduce CEC development complexity, the CH7322B

incorporates a robust and powerful mechanism to

process CEC message frames and execute some of the

opcode commands. The device’s advanced Auto Mode

Technology† simply provides HDMI-CEC playback

systems with the ability to accomplish three mandatory

CEC functions – One Touch Play, Suspend and Resume

without programming any of CH7322B registers. For

example, when a HDMI-CEC DVD player is in standby

mode and if the CEC “Set Stream Path” Opcode is

received, the CH7322B will generate an interrupt signal

to trigger the host controller to resume system normal

operation.

More sophisticated CEC features like Deck Control,

Tuner Control, Volume Adjustment and Recording

Functions for AV devices can also be accomplished

through programming CH7322B internal registers.

Once the received CEC message frame is verified, the

CH7322B will store the embedded CEC function

opcode into register buffers and send an interrupt signal

to notify the host controller. The system can then take

an action according to the opcode command stored in

the CH7322B register buffers.

The CH7322B has a master DDC interface and when

the Hot Plug Signal is high, the CH7322B will

automatically obtain its Physical Address in the EDID

block of the HDMI Sink and keep it in the designated

registers for future usage.

The CH7322B accepts a wide range of input clock

frequencies that are generated from either a crystal or an

external clock source for CEC command timing. This

low-cost, power-saving and space-saving device is

available in 16 pin lead-free SSOP and QFN packages.