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TPS658620ZQZT датащи(PDF) 51 Page - Texas Instruments

номер детали TPS658620ZQZT
подробное описание детали  Advanced Power Management Unit
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3.48 INTEGRATED SUPPLY SEQUENCING – SUPPLY ENABLE CONTROL
TPS658620
Advanced Power Management Unit
www.ti.com
SLVS993 – OCTOBER 2009
The default status (ON or OFF) of each rail is shown in Table 3-17.
If the default for a supply rail is ON the trigger group associated to the supply determines the control
signal that initiates the delay time to the start of the rail power up. There are four trigger groups, one
internal and three external pins:
INTERNAL
This group is controlled by an internal signal that goes high when the TPS658620 goes
from the RTC_ON state to the SUPPLYSEQ state.
SM0EN
This group is controlled by the falling edge of the SM0EN pin and starts when the pin
voltage is below its VIL level.
SM1EN
This group is controlled by the rising edge of the SM1EN pin and starts when the pin
voltage is above its VIH level.
SYNCEN
This group is controlled by the rising edge of the SYNCEN pin and starts when the pin
voltage is above its VIH level.
The trigger group of each rail and its associated delay is shown in Table 3-17. If a supply rail has a default
state of ON and the appropriate trigger is high, the rail will be turned on after the delay time for that rail
has expired. The delay time starts when the trigger signal for that supply has gone high, while
SUPPLYSEQ state is set. No delays are available after NORMAL mode is set.
Table 3-17. TPS658620 Integrated Supply Power-Up Defaults
TPS658620 SETTINGS
DEFAULT
DEFAULT
SUPPLY
TRIGGER
DELAY
STATE
VOLTAGE
LDO0
OFF
3.3V
SM1EN
3.75ms
Value applies to LDO0, LDO1
LDO1
ON
1.1V
SYNCEN
LDO2
ON
1.2V
INTERNAL
0ms
Value applies to LDO2, LDO3
LDO3
OFF
3.3V
SM1EN
LDO4
ON
1.8V
INTERNAL
3.75 ms
LDO6
ON
3.3V
SYNCEN
15ms
LDO7
OFF
3.3V
INTERNAL
Value applies to LDO6, LDO7 and LDO8
LDO8
OFF
2.85V
SYNCEN
LDO5
ON
2.85V
SYNCEN
3.75ms
Trigger applies to both LDO5 and LDO9
Value applies to LDO5, LDO9
LDO9
OFF
2.85V
SM0
ON
1.2V
SM0EN
2.5ms
SM1
ON
1.0V
SM1EN
2.5ms
SM2
OFF
4.4V
INTERNAL
15ms
The ON or OFF mode for each supply is defined by the supply enable RAM control bits and enable pins
SM0EN, SM1EN and LDO4EN. The supply enable bits are located in registers SUPPLYENA,
SUPPLYENB, SUPPLYENC, SUPPLYEND, SUPPLYENE (see supply functional description for more
details). The functionality of the RAM bits and enable pins is dependent on the state set in the state
machine as follows:
When the NORMAL state is NOT set : The pins SM1EN , SM0EN and LDO4EN will always control the
ON or OFF modes for all supplies that use them as triggers. The supply enable RAM bits will control the
ON or OFF modes for the supplies.
When the NORMAL state is set: The supply enable RAM bits will always control the ON or OFF modes
for the supplies. The pins SM1EN, SM0EN and LDO4EN may control the ON or OFF modes for supplies
SM1, SM0 and LDO4. The enable pins do not control the ON or OFF modes of any other supplies.
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DETAILED DESCRIPTION
51


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