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TPS658620ZQZT датащи(PDF) 50 Page - Texas Instruments |
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TPS658620ZQZT датащи(HTML) 50 Page - Texas Instruments |
50 / 104 page 3.45 CNOPOWER CAPACITOR DISCHARGE 3.46 SEQUENCER STATUS 3.47 SUPPLY SEQUENCING & HOST INTERFACE 3.47.1 INTEGRATED SUPPLY SEQUENCING TPS658620 Advanced Power Management Unit SLVS993 – OCTOBER 2009 www.ti.com The status bit COMPDET=1 (register STAT2, address 0xBA) when the NORMAL state is entered after a reboot cycle triggered by the HOTRST pin. The status bit COMPDET=0 when the NORMAL state is entered, after a power-up, sleep cycle or software triggered reboot cycle. The bit COMPDET is reset to 0 when bit SPARECC0=1, in register SPARE2 (address 0xCC). After resetting the COMPDET bit the host needs to set SPARECC0=0 to enable detection of another reboot cycle set via the HOTRST pin. An interrupt is generated when the TPS658620 transitions from the POWER GOOD CHECK state to the NORMAL state , COMPDET=1 and IMASK_COMP=0 in register INTMASK4 (address 0xB3). An interrupt request is generated after the NORMAL state is set if IMASK_COMP=0 and COMPDET value changes from 1 to 0. Table 3-16. Reboot Flag Control SPARE2 [Addr 0xCC] Defaults in BOLD Bit Number B7 B6 B5 B4 B3 B2 B1 B0 Bit Name SPARECC7 SPARECC6 SPARECC5 SPARECC4 SPARECC3 SPARECC2 SPARECC1 SPARECC0 RESET REBOOT BY Function SPARE SPARE SPARE SPARE SPARE SPARE SPARE HOTRST STATUS BIT DO NOT When 0 NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED RESET When 1 NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED RESET HARD REBOOT: The HARD REBOOT state powers down all the TPS658620 supplies, with exception of the RTC_OUT LDO. SUPPLYLOAD: When the SUPPLYLOAD state is set all the registers are reset to their defaults, and the non-volatile memory is reloaded into the RAM. The supplies are not sequenced, and they will return to their on/off and output voltage defaults upon entering the SUPPLYLOAD state (on/off, default voltages). The timers TBOOT, THOTPLUG and TSYNCEND are reset and started. The SUPPLYSEQ state ends when t > TSYNCEND, and the POWER GOOD CHECK state is set. The external capacitor connected to the TNOPOWER pin is always discharged when the sequencer sets NOPOWER=LO in the following states: POWER-UP, RTC, REBOOT REQUEST, HARD REBOOT and SLEEP. For large capacitance values (above 330nF) the external capacitor may not be fully discharged during reboot cycles, and as a result the NOPOWER pulse width may be slightly reduced when compared to the value indicated in the parametric tables. Sequencer status information is available at registers 0xBA, bit COMPDET and register 0xBB bits SLEEPREQ and RESUME. See STATUS REGISTERS section for functional description of these bits. The TPS658620 enables the implementation of complex supply sequencing. With the exception of RTC_OUT, the integrated power-up sequencing starts when the TPS658620 state machine enters the SUPPLYSEQ state. The RTC_OUT LDO is always enabled in the RTC state, which occurs before the SUPPLYSEQ state, and the output of this LDO can be used to power an external processor or circuitry in systems where the supply sequencing is controlled externally using pins SM0EN, SM1EN or SYNCEN. Each supply rail is controlled by a combination of its default status (ON or OFF), its assigned sequencing trigger group (INTERNAL, SM0EN, SM1EN or SYNCEN), and a delay time. DETAILED DESCRIPTION 50 Submit Documentation Feedback |
Аналогичный номер детали - TPS658620ZQZT |
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Аналогичное описание - TPS658620ZQZT |
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