System features introduction STA2064
16/19 Doc ID 16057 Rev 3
3.6 IO groups
V
ddio
is split into the following groups:
● V
ddio_on
(a)
●
V
ddiox
(This is split into 5 types: V
ddioA
, V
ddioB
, V
ddioC
, V
ddioD
, V
ddioE
)
(b)
●
V
USB
(USB 2.0 PHY transceiver)
The IO supply type and corresponding pads details are as follows:
● V
ddio_on
: Power Supply pins for the IO buffers of the always ON section. It supplies
POR, PWREN, VDDOK, BATOK, WAKE, SXTALI, SXTALO, OSC32KOUT
● V
ddioA
: Power Supply pins for the IO buffers. It supplies most GPIOs and dedicated
pads for JTAG, MMC0 and GPS
● V
ddioB
: Power Supply pins for the IO buffers. Supplies to the CLCD IOs
● V
ddioC
: Power Supply pins for the IO buffers. Supplies the SDMC IOs
● V
ddioD
: Power Supply pins for the IO buffers. Supplies the following IOs: GPIO64:67,
GPIO96:127 and dedicated pads for TEST (SCANEN, TAPSEL)
● V
ddioE
: Power Supply pins for the IO buffers. Supplies the following IOs: CAN, MSP,
GPIOs related to SDMMC functionality
● V
USB
: 3.3V USB PAD power supply
● V
TSC
: 3.3V Touchscreen PAD power supply.
a. Vddio_on is always 1.8V.
b. When V
ddio
domain A is powered with 2.5V (its PSW bit = 1), all other V
ddio
domains (B, D, E) should be
powered with same voltage level i.e 2.5V. V
ddio
domain C and V
ddio_coreon
is always powered with 1.8V. The
vice-versa is not true. So for example, application can power voltage bank B with 2.5V (keeping its PSW=1)
and V
ddio
A as 1.8V.
