Rainbow Electronics AT73C246 - Manual (Page 31)

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
T
STBY_OUT
STANDBY OUT Event
detection time
95 100 105 µs
T
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
T
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
T STBY_OUT
T OFF_VDD2
V DD2 (1V)
V DD0 (1.85V)
V DD3 (3.3V)
1V
1.2V
RSTB
V DD1 (1.2V)
T OFF_VDD1
1.85V T OFF_VDD0
3.3V T OFF_VDD3
V DD4 (CODEC)
T OFF_VDD4
STANDBY
STATE
SUPPLIES SHUTDOWN
STANDBY_OUT
EVENT
POWERDOWN
STATE
T STBY_OUT
T OFF_VDD3
V DD3 (3.3V)
V DD0 (1.85V)
V DD2 (1V)
3.3V
1.2V
RSTB
V DD1 (1.2V)
T OFF_VDD1
1.85V T OFF_VDD0
1V T OFF_VDD2
V DD4 (CODEC)
T OFF_VDD4
SEQUENCE A SEQUENCE B