Kontron SMARC-sA3874i - Manual (Page 47)

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User’s Guide
3.5 Electrical Specification
3.5.1 Supply Voltage
The ULP-COM sA3874i module operates over an input voltage range of 3.1V to 5.25V. Power is provided from the
carrier through 10 power pins as defined by the ULP-COM specification.
Caution! The ULP-COM specification states that the input voltage range should extend down to 3.0V. The sA3874i
lower limit is determined by a non-volatile register setting in the TI PMU used.
3.5.2 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 PMU.
3.5.3 No Separate Standby Voltage
The ULP-COM sA3874i does not have a standby power rail. Standby operation is powered through the main supply
voltage rail, as defined in the ULP-COM specification.
3.5.4 Module I/O Voltage
The ULP-COM sA3874i module complies with the default I/O voltage (1.8V) level defined by ULP-COM Hardware
specification. Module pin S158 (VDD_IO_SEL#) is tied low on the Module, per the ULP-COM specification,
indicating a 1.8V I/O voltage level.