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TPS2363PFBR Datasheet(PDF) 11 Page - Texas Instruments |
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TPS2363PFBR Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 44 page  TPS2363 www.ti.com SLUS680B – JANUARY 2006 – REVISED JANUARY 2010 APPLICATION INFORMATION Power On Reset AUXINA/B is the logic voltage supply. When AUXINA/B voltage is greater than the under voltage lock out (UVLO) the TPS2363 will start a reset. This clears all the registers and holds off all the SlotA/B voltages. Initialization takes less than 250 µs after the voltage on AUXINA/B is above the UVLO. A power glitch on AUXINA/B causes a TPS2363 reset. After reset, the main outputs are off even if the ONA/B inputs are active. The TPS2363 powers up with the FAULTA/B output clear. The AUXENA/B input to the TPS2363 is level sensitive to avoid race conditions at power-up. If AUNXENA/B is active when the TPS2363 powers up VAUXA/B turns on and the FAULTA/B output powers up clear. If FORCEONA/B is active, the VAUXA/B and main slot power outputs is active after reset. AUXINA/B should be powered first, then power to 12 V and 3.3 V. If AUXINA/B and 3.3 V are the same supply, they can be powered up together. If VAUXA/B is not used on the system, AUXINA/B must be tied to 3.3 V at the circuit board 3.3-V power plane. Operating modes The TPS2363 can be operated in one of two control modes. Direct mode, uses ONA/B and AUXENA/B to control slot power and SMBus mode uses the control registers in the SMBus. The SMBus can be used in direct mode to monitor status, while the supplies are controlled with ONA/B and AUXENA/B. When in direct mode the control register bits can not be written in the SMBus or the TPS2363 switchs to SMBus mode. Table 3. MODE- PIN CONNECTION MODE SIGNAL CONNECTION AUXENA/B GND SMBus ONA/B FORCEONA/B 100 k Ω pull up to VAUXINA/B A0 A1 GND DIRECT (if the SMBus is not used to read A2 status) SCL 10 k Ω pull up to VAUXINA/B SDA • If the SMBus and INT connects to multiple devices, the termination should be at the end of the bus and it should be a 10-k Ω resistor pulling up to 3.3 V or AUXIN depending on the application. • If the SMBus and INT is a short point to point connection a 100 k Ω pull up to 3.3 V or AUXIN can be used. Copyright © 2006–2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS2363 |
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