• 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 a 16-pin SSOP package.

Description

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. Through innovative design, the CH7322B can help our customers achieve their HDMI-CEC system requirement by drastically reducing complicated and time-consuming microcontroller programming effort.

To minimize CEC development complexity, the CH7322B incorporates a robust and powerful mechanism for handling CEC Message 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” Message Opcode is received, the CH7322B can generate an interrupt signal to trigger the host controller for 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 a CEC message is received, verified and interpreted, the CH7322B will store the requested CEC function into register buffers and send an interrupt signal to notify the host controller. The system firmware can then take an action based on the content of the register through the host controller serial port access.

The CH7322B has a master DDC interface and when the hot plug signal is high, the CH7322B will automatically obtain its Physical Address from a HDMI receiver’s EDID and save it in the designated register 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 a 16 pin lead-free SSOP package.

Applications

• DVD Players
• DVD Recorders
• Digital Video Cameras
• Personal Computers
• A/V Receivers
• Digital Set-top Boxes

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