pc87591l National Semiconductor Corporation, pc87591l Datasheet - Page 62

• Manufacturer Part Number: pc87591l
• Description: Lpc Mobile Embedded Controllers
• Manufacturer: National Semiconductor Corporation

www.national.com
3.0 Power, Reset and Clocks
3.1
3.1.1
The PC87591x has four power planes (wells), as shown in Table 10.
For correct PC87591x operation, V
applied, protection is provided against rise-time differences only.
3.1.2
The PC87591x has three main power states:
The following power states are illegal:
Battery Fail
Host Domain, Suspend, Analog and Battery Backed power planes are all powered off (i.e., in this case V
AV
Power Fail
Host Domain, Suspend and Analog power planes are powered off. Battery Backed power plane is powered on (i.e.,
in this case V
Power Applied
Suspend, Analog and Battery Backed power planes are powered on, Host Domain power plane may be on or off (i.e.,
in this case V
The Power Applied state has several sub-states, depending on the domain:
— The host domain has Host Power On and Host Power Off states, according to the V
— The core domain and host-core interface have Active and Idle states. For details, see Section 4.17 on page 235.
Host domain on and Suspend and/or Analog off (i.e., V
Suspend on and Analog off (i.e., V
CC
POWER
Power Planes
Power States
and V
Host Domain
Suspend
Analog
Battery Backed
1. See the tables in Section 2.2.1 on page 42 to Section 2.2.13, specifically the Power Well
2. V
Power Plane
BAT
column, for how the PC87591x external interface signals are assigned to various power
planes.
greater than the minimum value defined; otherwise, V
more details on the switching between them, refer to Section 6.2.9 on page 360.
DD
CC
PP
are all inactive).
, V
, AV
is an internal power signal derived from V
CC
CC
and AV
are active, V
Powers the LPC interface and host controlled
functions (except for RTC and MSWC) and
some external signals
Powers the core domain, the host-core interface,
the MSWC and their external signals
Powers some internal analog circuits and their
external signals
Powers the RTC, some MSWC registers, the
32.768 KHz clock/crystal oscillator signals and
some other storage elements that should be
preserved at all times
CC
CC
are inactive; V
must be applied whenever V
CC
BAT
active and AV
Table 10. PC87591x Power Planes
and V
1
DD
Description
BAT
may be active or inactive).
1
1
is active).
CC
DD
inactive) and vice-versa.
62
active and V
CC
DD
or V
is applied. Apply AV
1
BAT
BAT.
is used as the V
CC
V
PP
and/or AV
is taken from V
Power Pins Ground Pins
AV
V
V
V
PP
DD
CC
CC
CC
CC
DD
2
PP
are inactive).
at the same time that V
status;
source. For
CC
AGND
if it is
GND
GND
GND
DD
Revision 1.07
, V
CC
CC
is
,