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Company Logo NXP Semiconductors

  • Low-Voltage to High-Voltage Bus Interface

  • Created: Feb 11, 2014

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Inter-Integrated Circuit or I²C is a multimaster serial single-ended computer bus invented by Philips Semiconductor Division, today NXP Semiconductors. This technology is used in attaching low-speed peripherals to a motherboard, embedded system, mobile phones, or other digital electronic devices.

One family of devices under I²C, the Philips Semiconductors Gunning Transceiver Logic Translator Voltage Clamp (GTL-TVC), a family of bi-directional low-voltage translators, is designed in a BiCMOS process for protecting the sensitive I/Os on new advanced sub micron components. The GTL-TVC devices offer protection from over -voltage and electrostatic discharge applied by older legacy devices and translate the VIH and VOH switching levels.The GTL-TVC devices can also be used to interface between devices I/O’s operating at different voltage levels.

This circuit uses the GTL2010PW 10-bit bidirectional low-voltage translator which provides high-speed voltage translation with low ON-state resistance and minimal propagation delay. The device allows bidirectional voltage translations between 1.0 V and 5.0 V without the use of a direction pin. This also allows the use of different bus voltages on each source to drain channel so that a 1.5 V device can communicate with 2.5 V, 3.3 V or 5V devices without any additional protection. The schematic shows how the GTL2010 can be used in an application where two ASIC’s I²C ports (left side) operating at 1.5 V can interface to higher voltage devices (right side) operating at 3.3V and 5.0 V. One of the ASIC ports (MDDC on S1 & S2) only needs to interface with 5V I²C devices. The other ASIC port (MI²C on S3 & S4 and S5 & S6) needs to interface with both 3.3 V SMBus and 5.0 V I²C devices.



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