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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP3971 датащи(PDF) 36 Page - Texas Instruments |
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LP3971 датащи(HTML) 36 Page - Texas Instruments |
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36 / 52 page  LP3971 SNVS432V – JANUARY 2006 – REVISED MAY 2013 www.ti.com Register Programming Examples Example 1. Setting register 8h'12 value to 8h'3E' will enable LDOs 1–5. Example 2. Setting register 8h'39 to 8h'CC' will set LDOs 1 and 2 to 3.0V. These voltages will appear at the LDO outputs if the corresponding LDO has been enabled. Programming a voltage value to a LDO, which is off, will affect the LDO output voltage after the LDO is enabled. Enabling and programming the output voltage are separate operations. DIGITAL INTERFACE CONTROL SIGNALS Signal Definition Active State Signal Direction SYS_EN High Voltage Power Enable High Input PWR_EN Low Voltage Power Enable High Input SCL Serial Bus Clock Line Clock Input SDA Serial Bus Data Line Bidirectional nRSTI Forces an Unconditional Hardware Reset Low Input nRSTO Forces an Unconditional Hardware Reset Low Output nBATT_FLT Main Battery Removed or Discharged Indicator Low Output PWR_ON Wakeup Input to CPU High Input nTEST_JIG Wakeup Input to CPU Low Input SPARE Wakeup Input to CPU High/Low* Input EXT_WAKEUP Wake-Up Output for Application Processor High Output GPIO1/nCHG_EN General Purpose I/O/External Back-Up Battery Charger -/Low Bidirectional/Input GPIO2 General Purpose I/O - Bidirectional POWER DOMAIN ENABLES PMU Output HW Enable SW Enable LDO_RTC - - LDO1 SYS_EN LDO1_EN LDO2 SYS_EN LDO2_EN LDO3 SYS_EN LDO3_EN LDO4 PWR_EN/SYS_EN LDO4_EN LDO5 PWR_EN/SYS_EN LDO5_EN BUCK1 PWR_EN B1_EN BUCK2 SYS_EN/PWR_EN B2_EN BUCK3 SYS_EN B3_EN LDO_RTC TRACKING (nIO_TRACK) LP3971 has a tracking function (nIO_TRACK). When enabled, LDO_RTC voltage will track LDO1 voltage within 200 mV down to 2.8V when LDO1 is enabled. This function can be switched on/off by BPTR (8h'0E) register bit. LDO4, LDO5 AND BUCK 2 ENABLE SELECTION (LDO4_ESEL, LDO5_ESEL AND BUCK2_ESEL) LDO4, 5 and BUCK2 power domain enable is possible to change between SYS_EN and PWR_EN by register bits. 36 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LP3971 |
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