Rainbow Electronics AT73C246 - Manual (Page 34)

34
11050A–PMAAC–07-Apr-10
AT73C246
Figure 11-7. AT73C246 - RUN to STANDBY state Supplies Shutdown timing diagram.
Note: 1. VDDx activity during STANDBY state is set by register PMU_STANDBY_SUPPLIES.
2. VDDx activity during RUN state is set by Bit7 of register VDDx_CTRL.
11.4.4 HRST STATE
HRST state is a transition state used to restart the CPU:
• VDD
{0,1,2,3,4}
are switched off according to figure Figure 11-8 on page 35 depending on the
previous state
• VDD
5
is ON
• RSTB pin is forced to ground
Table 11-6. RUN to STANDBY state timing table
Symbol Parameter Comments Min Typ Max Units
T
STANDBY
STANDBY Event
Detection Time
150 160 170 µs
T
PWM
PFM/PWM Switching
time
Time from validated WAKEUP event (end of debounce
time when applicable) to PFM/PWM switching if
applicable.
460 500 540 µs
T
WAIT
WAKEUP Event
Detection Window
If a WAKEUP event occurs in this window the PMU
automatically restart at the end of the STANDBY
process.
150 160 170 µs
T
OFF_AUDIO
Audio CODEC
Shutdown Time
Audio CODEC is ON 486 512 538 ms
Audio CODEC is OFF 58 62 66 µs
T
OFF_VDDx
VDDx SHUTDOWN
Time
VDDx is OFF during both STANBY (1) and RUN (2) states. 58 62 66 µs
VDDx is OFF during STANBY state (1) .
VDDx is ON during RUN state (2) .
4.8 5.2 5.4 ms
T
ON_VDDx
VDDx STARTUP Time
VDDx is ON during STANBY state (1) .
VDDx is OFF during RUN state (2) .
4.8 5.2 5.4 ms
VDDx is ON during both STANBY (1) and RUN (2) states. 58 62 66 µs
RUN
STATE SUPPLIES SHUTDOWN
STANDBY
EVENT
STANDBY
STATE
T STANDBY
T OFF_AUDIO
T OFF_VDD2
T WAIT +
V DD2 (1V)
V DD3 (3.3V)
1V
1.2V
1.85V
3.3V
RSTB
T OFF_VDD1
T OFF_VDD0
T OFF_VDD3
1.85V
( V DD3 ON
or OFF )
SEQUENCE A SEQUENCE B
RUN
STATE SUPPLIES SHUTDOWN
STANDBY
EVENT
STANDBY
STATE
T STANDBY
T OFF_AUDIO
T OFF_VDD3
T WAIT +
V DD3 (3.3V)
V DD2 (1V)
3.3V
1.2V
1.85V
1V
RSTB
T OFF_VDD1
T OFF_VDD0
T OFF_VDD2
1.85V
( V DD3 ON
or OFF )
V DD1 (1.2V)
V DD0 (1.85V) T PWM
PWM
PWM
V DD1 (1.2V)
V DD0 (1.85V) T PWM
PWM
PWM
PFM
V DD0
PFM
V DD1
PFM
V DD0
PFM
V DD1