TPS2363 Datasheet, PDF (11/41 Pages) Texas Instruments – PCIExpress Server Dual Slot Hot Plug Controller

TPS2363
www.ti.com
SLUS680A – JANUARY 2006 – REVISED FEBRUARY 2006
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 ms 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.
MODE- PIN CONNECTION
MODE
SIGNAL
CONNECTION
SMBus
AUXENA/B
ONA/B
GND
FORCEONA/B
100 kΩ pull up to VAUXINA/B
DIRECT (if the SMBus is not used to read A0
status)
A1
GND
A2
SCL
10 kΩ 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-kΩ 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 kΩ pull up to 3.3 V or AUXIN can be used.
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