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SYSTEM SEQUENCING AND TPS65810 OPERATING MODES
SLEEP STATE
ONLY RTC_LDOISON
POWERPATH ACTIVE
RESPWRON = 0
REGISTERCONTENTSNOT RESET
INTERRUPT CLEARED
OFF
PROCESSOR
STANDBY STATE
RESPWRON = HI
PGFORSM1&SM2
ismasked
ENABLESTATE
SEQUENCESTATE
START INTEGRATED
SUPPLY START - UP SEQUENCE
RESPWRON
= LO
POWERGOOD
CHECKSTATE
RESPWRON=HI
ENABLEPOWERGOODCOMPARATORS
INT PINMODESET BY INTERRUPT
CONTROLLER
NORMAL MODE
RESPWRON=HI
ANY
STATE
RESETSTATE
RESPWRON=LO
START SYSTEMRESET PULSE TIMER
WHENHOT_RESET=HI
RESET
TIMEREXPIRES
V(SYS_IN) > AND
V(OUT) > V
V
(LOW_SYS)
V(AC) > V
UVLO
OR
V(USB) > V
UVLO
OR
V(BAT) > V
UVLO
NOPGOOD
FAULT
STANDBY
ON
STANDBY
OFF
PGOOD
FAULT
PGOOD
FAULT
V(OUT) < V
UVLO
RESPWRON=LO
V(SYS_IN) <
OR
POWER
CYCLE
AND
SLEEP NOT SET BY
THERMAL FAULT
THERMAL
FAULT
V(HOT_RESET)=LO
OR
I2CSOFT_RESET
REGISTERBIT
SOFT_RST = HI
V(HOT_RESET)= HI OR
I2CSOFT_RESET
REGISTERBIT
SOFT_RESET = LO
(SELFCLEARED)
V(HOT_RESET)=LO
OR
I2CSOFT_RESET
REGISTERBIT
SOFT_RST= HI
PGOODFAULT : A NON- MASKEDBIT OF THE
POWER _GOODI2CREGISTER TOGGLES
FROMLO TOHI
STANDBY ON : SM1 ANDSM2 SET INSTANDBY
MODEBY GPIOORI 2CCOMMAND
STANDBY OFF : SM1 ANDSM2 EXIT STANDBY
MODEBY GPIOOR
I2CCOMMAND
RESETTIMER : VALUESET BY CAPACITOR
CONNECTED TO TRSTPWONPIN
I2CSOFT_RESETBIT LOCATEDIN
SOFT_RESET REGISTER, BIT B0
POWERUP
OR
I2CSOFT_RESET
REGISTER
BIT SLEEP _MODE = HI
(SELF-CLEARED )
RESPWRON=LO
UVLO
V
(LOW_SYS)
LOADPOWERUP DEFAULTSIN
I2CREGISTERS
CONNECT AC , USBORBAT PIN TO
OUT PIN
DISABLEPOWERGOODFAULT
DETECTION
INT PIN = HIGHIMPEDANCE
POR_FLAG= HI
POWERUP DEFAULTSLOADED
IN ALL I2CREGISTERS
(ExceptINT_ACKn)
POWERDOWNRAILS,
WAIT 5msec
TPS65810
TPS65811
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
The TPS65810 has a state machine that controls the device power up and power down sequencing. The main
operating modes are shown in the state diagram below:
Figure 28. TPS65810 State Diagram
POWER UP – If the AC, USB and BAT pin voltages are below the internal UVLO threshold V
UVLO
(2.5 V typ) all
IC blocks are disabled and the TPS65810 is not operational, with all functions OFF. When an external power
source or battery with voltage greater than the V
UVLO
voltage threshold is applied to AC/USB or BAT pins the
internal TPS65810 references are powered up, biasing internal circuits. When all the main internal supply rails
are active the TPS65810 I
2
C registers are set to the power-up default values, shown below:
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