The
AM263Px
Power Management System
contains a Power Management Unit (PMU), which includes reference voltage generators,
power rail monitors that can trigger a device reset, and a threshold based
temperature monitor. The
AM263Px
also contains an internal
BIAS LDO, which generates a 1.8-V output on the VDDS18_LDO pin, which should be
externally connected to VDDS18 for IO Bias.
Figure 6-8 shows the different power supply domains in the
AM263Px
. The
AM263Px
has the following power
domains, some of which must be externally supplied and some of which are internally
generated by LDO modules in the device.
- 3.3-V IO and analog
Supply: The 3.3-V supply must be provided externally to the VDDS33
and VDDA33 pins and is used for analog logic and IOs.
- 1.2-V Core Supply: The
1.2-V core supply must be provided externally to the VDD and VDDR1/2/3 pins
and is used for Digital logic and SRAMs.
- 1.8-V IO BIAS Supply:
The 1.8-V IO Bias supply, VDDS18, is generated internally by the BIAS LDO
from the 3.3-V Supply and connect to the VDDS18_LDO pin which can to be
connected to VDDS18 on the board. The supply is used for IO Bias.
- 1.8-V Analog Supply:
The 1.8-V Analog Supply, VDDA18, is generated internally and connected to
the VDDA18_LDO pin which can be connected to VDDA18 and VDDA18_OSC_PLL (1.8V
Analog Supply for PLL) on the board. The supply powers the analog logic and
PLL.
- The 1.8V
Analog Supply can be re-programmed to 1.7V to use for VPP
programming. See Section 6.2.1.1 for more
information.
- VPP 1.7-V Supply: The
1.7-V VPP supply must be provided externally when programming the Fusible
ROM (FROM) present in the device. When the FROM is not being programmed the
1.7-V supply may be disabled or disconnected from the device .
Figure 6-8
AM263Px
Power Supply
Overview

As a power saving option, the
AM263Px
supports clock gating for
all the peripherals as well as including a power down feature for On-Chip Static
Random Access Memory (OCSRAM) banks. Details of IP clock gating can be found in
Section 6.2.3.1 and the
power down mode of OCSRAM is explained in Section 6.2.3.2.