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UCD9081RHBTG4 Datasheet(PDF) 9 Page - Texas Instruments

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Part # UCD9081RHBTG4
Description  8-CHANNEL POWER SUPPLY SEQUENCER AND MONITOR WITH ERROR LOGGING
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCD9081RHBTG4 Datasheet(HTML) 9 Page - Texas Instruments

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UCD9081
www.ti.com
SLVS813B – JUNE 2008 – REVISED DECEMBER 2010
FUNCTIONAL DESCRIPTION
POWER SUPPLY SEQUENCING
The UCD9081 can be configured to sequence power supply rails using the enable signals (ENx) or the
general-purpose outputs (GPOx) in one of four ways:
1. A rail can be configured to not be sequenced
2. Using a delay time after UCD9081 RESET. The enable/GPO is asserted after UCD9081 RESET plus the
user specified delay
3. Using a delay time after another (parent) rail has achieved regulation (VRAIL is within specified under- and
overvoltage settings). The enable/GPO is asserted after the (parent) rail is in regulation plus the user
specified delay.
4. Using a (parent) rail voltage. The enable/GPO is asserted after the (parent) rail voltage is greater than or
equal to the user specified voltage.
POWER-SUPPLY ENABLES
The UCD9081 can sequence and enable/disable up to eight power supplies through the ENx (EN1 to EN8)
signals. These signals can be configured active-high or active-low, supporting power supplies with either polarity.
EN8 can also be configured as a GPO (GPO1). EN8/ADDR1/GPO1 is also used for I2C address selection
(ADDR1).
Note that while the UCD9081 is in RESET, the enable signals are in a high-impedance state. The enable signals
should be pulled up or down on the board according to the desired default power-supply state (enabled or
disabled).
GENERAL PURPOSE OUTPUTS
The UCD9081 can control up to four general-purpose digital outputs through the same sequencing mechanisms
as the power supply enables. These general-purpose outputs (GPO1–GPO4) can be used for digital signals such
as resets or status inputs to other devices. Note that these signals are multiplexed with other functions (primarily
I2C address selection). See the Terminal Functions table to ensure that these signals are used properly by the
application. Also note that the GPO1 signal is multiplexed with EN8.
I
2C INTERFACE
The UCD9081 power-supply sequencer has a 100 kHz, slave mode I2C interface for communication with an I2C
master. The I2C master uses this interface to configure and monitor the UCD9081. Note that the master must
support clock stretching in order to properly communicate with the UCD9081.
Copyright © 2008–2010, Texas Instruments Incorporated
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