Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 31)

11050A–PMAAC–07-Apr-10

AT73C246

When the POWERDOWN state is reached from the STANDBY state, the CPU power supplies

are switched off sequentially as described in Figure 11-4.

Figure 11-4. AT73C246 - STANDBY to POWERDOWN state Supplies Shutdown timing diagram.

Notes: 1. VDDx activity during STANDBY state is set by register PMU_STANDBY_SUPPLIES.

2. VDD4 activity during RUN state is set by Bit7 of register VDD4_CTRL.

11.4.2 RUN STATE

When AT73C246 is in RUN state:

•VDD

{0,1,2,3,5}

power supplies are ON.

• RSTB pin is released.

• PMU functions are under software control (LDO4, AUDIO CODEC, ADC Controller)

• Led pin is driven according to register PMU_LED (0x0B).

Table 11-3. STANDBY to POWERDOWN state timing table

Symbol Parameter Comments Min Typ Max Units

STBY_OUT

STANDBY OUT Event

detection time

95 100 105 µs

OFF_VDDx

VDDx SHUTDOWN Time

VDDx is OFF during STANDBY state

(1)

58 62 66 µs

VDDx is ON during STANDBY state

(1)

4.8 5.2 5.4 ms

OFF_VDD4

VDD4 SHUTDOWN Time

VDD4 is OFF in RUN state

(2)

58 62 66 µs

VDD4 is ON in RUN state

(2)

4.8 5.2 5.4 ms

STANDBY

STATE

SUPPLIES SHUTDOWN

STANDBY_OUT

EVENT

POWERDOWN

STATE

STBY_OUT

OFF_VDD2

DD2

(1V)

DD0

(1.85V)

DD3

(3.3V)

1.2V

RSTB

DD1

(1.2V)

OFF_VDD1

1.85V

OFF_VDD0

3.3V

OFF_VDD3

DD4

(CODEC)

OFF_VDD4

STANDBY

STATE

SUPPLIES SHUTDOWN

STANDBY_OUT

EVENT

POWERDOWN

STATE

STBY_OUT

OFF_VDD3

DD3

(3.3V)

DD0

(1.85V)

DD2

(1V)

3.3V

1.2V

RSTB

DD1

(1.2V)

OFF_VDD1

1.85V

OFF_VDD0

OFF_VDD2

DD4

(CODEC)

OFF_VDD4

SEQUENCE A SEQUENCE B

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 158 159

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