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2.4 Electrical Specifications
2.4.1. Supply Voltage
The SMARC T335X module operates over an input voltage range of 3.35V
to 5.25V. Power is provided from the carrier through 10 power pins as
defined by the SMARC specification.
Caution!
The SMARC specification states that the input voltage range
should extend down to 3.0V. The SMARC T335X lower limit is determined
by a non-volatile register setting in the TI PMIC used and is set 3.35V by
default. A single 5V DC input is recommended.
2.4.2. RTC/Backup Voltage
3.0V RTC backup power is provided through the VDD_RTC pin from the
carrier board. This connection provides back up power to the module PMIC.
The RTC is powered via the primary system 3.3V supply during normal
operation and via the VBAT power input, if it is present, during power-off.
2.4.3. No Separate Standby Voltage
The SMARC T335X does not have a standby power rail. Standby operation
is powered through the main supply voltage rail, as defined in the SMARC
specification.
2.4.4. Module I/O Voltage
The SMARC T335X module supports 3.3V level I/O voltage only as defined
by SMARC Hardware specification. Module pin S158 (VDD_IO_SEL#) is
tied high through a resistance of 100K on the Module, per the SMARC
specification, indicating a 3.3V I/O voltage level. The SMART-BEE
evaluation carrier also supports 3.3V I/O SMARC module only.
SMARC T335x Computer on Module User's Manual v.1.2
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