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P3V3-BATT Datasheet(PDF) 7 Page - Freescale Semiconductor, Inc |
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P3V3-BATT Datasheet(HTML) 7 Page - Freescale Semiconductor, Inc |
7 / 17 page Freescale Semiconductor, Inc FRDM-KL46Z Page 7 of 17 5 FRDM-KL46Z Hardware Description 5.1.1 Power Supply There are multiple power supply options on the FRDM-KL46Z. It can be powered from either of the USB connectors, the VIN pin on the I/O header, an on-board coin cell battery, or an off-board 1.71-3.6V supply from the 3.3V pin on the I/O header. The USB and VIN supplies are regulated on-board using a 3.3V linear regulator to produce the main power supply. The other two sources are not regulated on-board. Table 2 provides the operational details and requirements for the power supplies. Table 2. FRDM-KL46 Power Requirements Supply Source Valid Range OpenSDA Operational? Regulated on- board? OpenSDA USB 5V Yes Yes K20 USB 5V No Yes VIN Pin 4.3-9V No Yes 3.3V Pin 1.71-3.6V No No Coin Cell Battery 1.71-3.6V No No Note that the OpenSDA circuit is only operational when a USB cable is connected and supplying power to OpenSDA USB. However, protection circuitry is in place to allow multiple sources to be powered at once. Figure 3- Power Supply Schematic |
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