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TPS658620ZQZT датащи(PDF) 47 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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TPS658620ZQZT датащи(HTML) 47 Page - Texas Instruments

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3.44 STATE MACHINE DESCRIPTION
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
The state machine transitions for the TPS658620 have been defined as shown below.
1. Supply sequencing started only when LDO4EN voltage level is a logic high
2. REBOOT REQUEST state transitions to the HARD REBOOT state
3. Supply sequencing is considered complete only if SM0 is turned ON
4. Sequencer goes into sleep during initial power-up cycle and ONLY RESUME pin can trigger exit from
sleep state
In a normal power-up sequence the state machine will step through the following states:
POWER-UP: If the internal digital supply (2V2) is below the internal UVLO threshold, VUVLO (2V typ), all IC
blocks are disabled and the TPS658620 is not operational. When the 2V2 supply voltage rises above
VUVLO, the POWER-UP state is entered, an internal delay (TPOR, 8ms typ) is started and the SYS power
path is enabled. The SYS pin voltage is sensed by an internal comparator, and compared to the internal
threshold VLOW_SYS. When the power-on-reset delay expires and V(SYS) > VLOW_SYS the TPS658620
enters the RTC mode.
RTC: When the RTC state is set the nNOPOWER pin is pulled to ground, discharging the external
capacitor connected to pin TNOPOWER and resetting the NOPOWER timer. The RTC_OUT LDO is
turned off, and the voltage at pin RTC_OUT is flagged as low if V(RTC_OUT) < VRTCLOW The RTC state
ends when the timer TCHECK expires.
RTC_ON: When the state RTC_ON is set the integrated current source connected to the TNOPOWER pin
and the RTC_OUT LDO are enabled. If the RTC_OUT voltage was flagged as low in the RTC state the
TNORTC timer is enabled, and the NORTC pin is pulled low until V(RTC_OUT) > VRTC_PGOOD. The TNORTC
timer starts counting when RTC_OUT > VRTCLOW, and NORTC will be set to hi when t > TNORTC.
The TNOPOWER current source will remain ON until a new reboot cycle or sleep cycle is set, charging
the external capacitor connected to the TNOPOWER pin. The NOPOWER pin will be at a low logic level
until the TNOPOWER pin voltage is above an internal threshold (1.23v typ). When NOPOWER pin
transitions from LO
→HI, a 250µsec (typ) positive going pulse is generated at CHG_STAT pin. The
TNOPOWER external capacitor is discharged whenever the sequencer sets the NOPOWER pin to a low
state.
The RTC_ON state ends when V(RTC_OUT) > VRTC_PGOOD or when the internal watchdog timer TMAX
expires.
WAIT: The TPS658620 will go into the WAIT state when exiting the RTC state during the initial power-up
cycle. To avoid undesired lockup conditions this operational mode should be used only when the boot
timer is enabled.
Three internal timers are started when the state machine enters the WAIT state. These timers run
independent of the sequencing state and have the following functionality:
• BOOT Timer (T
BOOT): Sets the TPS658620 in the SLEEP REQUEST state if it expires during WAIT
state.
• HOTPLUG Timer (T
HOTPLUG): SLEEP REQUEST state set by V(SYS) < VLOWSYS is inhibited until this
timer expires
• NORTC Timer (T
NORTC): NORTC pin will be set to a logic low level until this timer expires
The BOOT timer value is set to 500ms and the NORTC pulse width is set to 10ms.
SUPPLYSEQ: During the SUPPLYSEQ state all the internal supplies, with exception of RTC_OUT, are
initially turned off and then turned on according to a pre-programmed internal sequencing. Three internal
timers are started when the state machine enters the SUPPLYSEQ state. These timers run independent
of the sequencing state and have the following functionality:
• BOOT Timer (T
BOOT): Sets the TPS658620 in the SLEEP REQUEST state if it expires during
SUPPLYSEQ state.
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DETAILED DESCRIPTION
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