Secure Digital (SD) card
Freedom Board for Kinetis K28F (FRDM-K28F), User's Guide, Rev. 0, 04/2017
NXP Semiconductors
15
10. Serial port
The primary serial port interface signals are PTC24 LPUART0_RX_TGTMCU and PTC25
LPUART0_TX_TGTMCU. These signals are connected to the OpenSDA v2.2 circuit.
11. QuadSPI memory
FRDM-K28F includes a single QuadSPI memory with Execute in Place (XiP). The on-board QuadSPI
uses the Micron MT25QU256ABA, which is 256 Mb (32 MB) in size. The QuadSPI interface offers up
to 100 MHz performance for the Single Data Rate (SDR). Header J16 provides a convenient means for
energy consumption measurement. The QuadSPI is also supported by the internal Kinetis BootROM.
12. Mobile SDRAM memory
FRDM-K28F also includes a single 128 Mb mobile SDRAM memory that operates at 3.3 V. The
on-board mobile SDRAM uses the ISSI IS42SM16800H-6BLI. The SDRAM controller interface offers
performance of up to 75 MHz. Header J10 provides a convenient means for energy consumption
measurement.
13. Secure Digital (SD) card
A micro SD card slot is available on the FRDM-K28F board. It is connected to the SD Host Controller
(SDHC) signals of the MCU. This slot accepts micro SD memory cards. The SD card detect pin is an
open switch that shorts with VDD when a card is inserted.
Table 6
shows the SDHC signal connection
details.
Figure 13. Micro SD card connector
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