®
ACT8938
Rev 3, 23-Dec-11
SYSTEM CONTROL INFORMATION
Interfacing with the Marvell Aspen
The ACT8938 is optimized for use in applications
using the Marvell Aspen processors, supporting
both the power domains as well as the signal
interface for these processors.
the ACT8938 pin names and the Marvell Aspen
processors pin names are provided. When this is
done, the Aspen pin names are located after the
ACT8938 pin names, and are italicized and located
inside parentheses. For example, VSEL
(DVS_GPIO) refers to the logic signal applied to the
ACT8938's VSEL input, identifying that it is driven
from the Aspen's DVS_GPIO output. Likewise,
OUT2 (VDD_IO ) refers to ACT8938's OUT2 pin,
identifying that it is connected to the Aspen's
VDD_IO power domain.
While the ACT8938 supports many possible
configurations for powering these processors, one
of the most common configurations is detailed in
this datasheet. In general, this document refers to
the ACT8938 pin names and functions. However, in
cases where the description of interconnections
between these devices benefits by doing so, both
Table 2:
ACT8938 and Marvell Aspen Power Domains
POWER DOMAIN
ACT8938 CHANNEL
TYPE
DEFAULT VOLTAGE
CURRENT CAPABILITY
VDD_M
VDD_IO
REG1
REG2
REG3
DC/DC
DC/DC
DC/DC
1.8V/1.8V
3.3V/3.3V
1.1V/1.0V
1150mA
1150mA
1300mA
VDD_Core
AVDD_OSC
AVDD_PLL
AVDD_USB
TBD
REG4
LDO
1.8V
150mA
REG5
REG6
REG7
LDO
LDO
LDO
3.3V
3.3V
3.3V
150mA
320mA
320mA
TBD
Table 3:
ACT8938 and Marvell Aspen Power Modes
POWER
QUIESCENT
CURRENT
CONTROL STATE
MODE
POWER DOMAIN STATE
PWRHLD is asserted, nHIB is de-asserted,
REG6 and REG7 are enabled by I2C
REG1, REG2, REG3, REG4, REG5,
REG6 and REG7 are all on
ALL ON
420µA
PWRHLD is asserted, nHIB is de-asserted,
REG6 and REG7 are disabled by I2C
REG1, REG2, REG3, REG4 and
REG5 are on. REG6 and REG7 are off
NORMAL
350µA
150µA
PWRHLD is asserted, nHIB is asserted,
FRC_ON1[ ] is 1, REG6 and REG7 are
disabled by I2C
REG1 is on. REG2,REG3,REG4,REG5,
REG6 and REG7 are off
Hibernate
ALL OFF
PWRHLD is de-asserted, nHIB is
asserted, REG6 and REG7 are disabled by
I2C
REG1, REG2, REG3, REG4, REG5,
REG6 and REG7 are all off
<18µA
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