The following table lists all power rails required for the proper operation of the K24 SOM. The carrier card designed for your application should provide these power rails based on the required peripheral I/O voltage. These supplies must be intentionally sequenced as outlined in the Power Sequencing section. Connect the VCCO pins of unused banks together and to the same potential (GND or a valid VCCO voltage).
| Power Rail Name | Supported Voltage Range | Maximum Current | Description |
|---|---|---|---|
| VCC_SOM | 5V (4.75V – 5.25V) 50 mV p-p maximum noise | 3A | Main power input to the SOM. Supplies power to on-board power regulators. Total of 3A across connectors. SOM consumes a maximum of 2A. |
| VCC_BATT 1 | 1.20 – 1.50V | 150 nA – 3650 nA | External battery input for the RTC |
| VCCO_HPA | 1.00V – 1.80V | 1.0A | Voltage rail for HPIO bank 65 and bank 66 |
| VCCO_HDA | 1.20V – 3.30V | 1.0A | Voltage rail for HDIO bank 26 |
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For the selected I/O type, the supply voltage tolerance at the SOM connector must be within +3%/–2%. For example:
- If an HPIO bank is configured for the LVDS (1.8V) standard, the VCCO at the SOM connector pin must be within 1.764V–1.854V.
- If an HDIO bank is configured for the LVDS_25 standard, the VCCO at the SOM connector pin must be within 2.450V–2.575V.