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UCD9081RHBTG4 Datasheet(PDF) 9 Page - Texas Instruments |
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UCD9081RHBTG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 34 page 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 Submit Documentation Feedback 9 Product Folder Link(s) :UCD9081 |
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