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 NXP Semiconductors

  • P82B96 Evaluation Daughter Card

  • Created: Mar 10, 2014

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The I2C-bus is widely used within separate units of many pieces of equipment, such as consumer electronics in TV, DVD, and STB or in the modules or racks of telecommunications and industrial electronics. Extending the use of I2C-bus to these pieces of equipment is more sensible rather than converting the I2C-bus signals to use some unrelated data transmission system. The ability to use conventional communications cable and its low-cost hardware to make a robust control link between pieces of equipment makes this option optimal. This daughter board allows the extension of I2C-bus to these various applications to enable signal generation and control.

This daughter board utilizes the P82B96 Bipolar Integrated Circuit. This IC creates a non-latching, bidirectional, logic interface between the normal IC-bus and a range of other bus configurations. It can interface IC-bus logic signals to similar buses having different voltage and current levels. It can interface to the 350A SMBus, to 3.3V logic devices, and to 15V levels and/or low-impedance lines to improve noise immunity on longer bus lengths. It achieves this interface without any restrictions on the normal IC-bus protocols or clock speed. The IC adds minimal loading to the IC-bus node, and loadings of the new bus or remote IC-bus nodes are not transmitted or transformed to the local node. Restrictions on the number of IC-bus devices in a system, or the physical separation between them, are virtually eliminated. Transmitting SDA and SCL signals via balanced transmission lines (twisted pairs) or with galvanic isolation (opto-coupling) is simple because separate directional Tx and Rx signals are provided. The Tx and Rx signals may be directly connected, without causing latching, to provide an alternative bidirectional signal line with IC-bus properties.

This daughter board can be configured to demonstrate applications such as: Generating Fm+ compatible signals at CON1, and Driving long Cat5e communication cables in ‘4-signal’ mode using two daughter boards.