5 Device Operating Modes

Initialization

The device mode control unit of the ATA6847 implements six different modes (see Device Operating Modes):

  • MCU Reset
  • Normal
  • Power Off
  • Standby
  • Deep Sleep
  • Sleep

 

Figure 5-2. Device Operating Modes (DOPM)
  • a: VVS ≥ VVS_PWRON (4.2V...4.55V)
  • b: VVS < VVS_PWROFF (2.8V...3V)
  • c: DOPM = Normal
  • e: Wake-up/interrupt event
  • f: DOPM = Standby
  • g: DOPM = Sleep
  • h: No wake-up and interupt event pending
  • j: Illegal DOPM code configuration via SPI
  • k: Number of enabled wake-up sources ≥ 1
  • l:
    • ATA6847-5050: Reset pulse time expired & NRES not driven low externally & ((RSTLVL = 0 & VVDD1 > VVDD1_UV_IO_Clear) (RSTLVL = 1 & VVDD1 > VVDD1_UV_Clear ))
    • ATA6847-3333: Reset pulse time expired & NRES not driven low externally & VVDD1 > VVDD1_UV_IO_Clear
    • ATA6847-5033: Reset pulse time expired & NRES not driven low externally & VVDD2 > VVDD2_UV_IO_Clear
  • m:
    • ATA6847/ATA6847L: Watchdog activated & any Reset event
    • ATA6847-5050: ( VVDD1 < VVDD1_UV_Set & RSTLVL = 1 ) VVDD1 < VVDD1_UV_IO_Set
    • ATA6847-3333: VVDD1 < VVDD1_UV_IO_Set
    • ATA6847-5033: VVDD2 < VVDD2_UV_IO_Set
    • ATA6847/ATA6847L: NRES pulled low externally
  • n: VDDIOOVSD = 1 & VDDIO overvoltage has been detected
  • p: DOPM = Deep Sleep
  • q: Local wake-up has been detected
  • r: Local wake-up enabled
  • C1 = f j g & (!h !k )
  • C2 = g & h & k
  • C3 = (g p & r ) & h & k
  • C4 = p & r
Note:
  • Mode switching triggered by condition a or q will not activate the LH pin.
  • If DOPM = Normal mode and the CSCR [CSA1/2/3EN] bits are set, then CSA1/2/3 are enabled.
  • LIN communication is available only if DOPM = Normal and LIN Operation Mode (LOPM) is activated (default: LIN is in Standby mode).
LH (Limp Home) will be activated in MCU Reset mode when:
  • A watchdog failure event has been detected. (Watchdog time-out in Sleep mode will not activate LH.)
  • The device enters MCU Reset mode due to a VDDx undervoltage event.
  • VDDx undervoltage has been detected for longer than tReset after entering MCU Reset mode, triggered by (e).