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TPS658620ZQZT датащи(PDF) 50 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS658620ZQZT датащи(HTML) 50 Page - Texas Instruments

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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
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