PC87591E Datasheet, PDF (63/437 Pages) National Semiconductor (TI) – LPC Mobile Embedded Controllers

3.0 Power, Reset and Clocks (Continued)
The following table summarizes the power states described in relation with the PC87591x power planes.
Table 11. PC87591x Power States and Related Power Planes
Power State
Battery Fail
Power Fail
Active and Idle
Host Power Off
Power Applied
Host Power On
Illegal¹
Host Domain
(V_DD)
-
-
x
-
+
+
x
x
Suspend
(V_CC)
-
-
+
+
+
-
+
-
Analog
(AV_CC)
-
-
+
+
+
-
-
+
Battery
Backed
(V_PP)
-
+
+
+
+
x
x
x
1. Operation is not guaranteed.
V_BAT
-
+
x
x
x
x
x
x
Figure 10 shows the power state transitions.
V_BAT Off and V_CC Off (V_PP Off)
Battery Fail
V_CC On and
V_DD Off
V_BAT On (V_PP On)
and V_CC Off
V_BAT On (V_PP On)
and V_CC Off
Power Fail
V_CC On
V_CC On and
VDD Off
Host
Power Off
V_CC On and
V_DD On
V_DD Off
V_DD On
Host
Power On
V_DD On
V_CC On
Power Applied
(V_CC On)
Hardware
Event
Active
Software
Controlled
Idle
Software
Controlled
Hardware
Event
Active
with WAIT
Host Domain
Core Domain
Figure 10. Power State Transitions
3.1.3 Power Connection and Layout Guidelines
The PC87591x requires a power supply voltage of 3.3V ± 10% for all the digital supplies (V_CC and V_DD). The analog power
supply requires a voltage of 3.3V ± 10% or 3.3V ± 5%. A 3.3V ± 5% analog supply is recommended since it improves the
accuracy of measuring input voltage values close to the full-scale (see Section 7.4.1 on page 378).
Revision 1.07
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