NXP Semiconductors MIMXRT1170HDUG Hardware Development Manual

Table 10. Reset and miscellaneous recommendations (continued)Item Recommendation DescriptionDCDC_PSWITCH PIN is below 0.5 Vbefore power up.2. ON/OFF For portable applications, the ON/OFFinput may be connected to theON/OFF SPST push-button. The on-chip debouncing is provided, and thisinput has an on-chip pullup. If not used,ON/OFF can be a no-connect. A 4.7-kΩto 10-kΩ series resistor can be usedwhen the current drain is critical.A brief connection to GND inthe OFF mode causes the internalpower management state machine tochange the state to ON. In the ONmode, a brief connection to GNDgenerates an interrupt (intended to bea software-controllable power-down).Approximately five seconds (or more) toGND causes a forced OFF.3. TEST_MODE The TEST_MODE input is internallyconnected to an on-chip pull-downdevice. You may either float this signalor tie it to GND.This input is reserved for NXPmanufacturing use.Table 11. ROM Bootloader Peripheral PinMuxPeripheral Instance Port (IO function) PAD Mode NoteLPUART 1 LPUART1_TX GPIO_AD_24 ALT0 Can be used for serialdownloader mode Refer to SerialDownloader inReference Manual formore information.LPUART1_RX GPIO_AD_25 ALT0LPSPI 1 LPSPI1_SCK GPIO_AD_28 ALT0 Serial NOR/EEPROM connectedto one of the LPSPI ports can beused as a recovery device.Refer to Recovery devicesin Reference Manual formore information.Note: recovery device boot isdisabled by default. Fuses mustbe blown to enable and configurethis option.LPSPI1_PCS0 GPIO_AD_29 ALT0LPSPI1_SDO GPIO_AD_30 ALT0LPSPI1_SDI GPIO_AD_31 ALT02 LPSPI2_SCK GPIO_SD_B2_07 ALT6LPSPI2_PCS0 GPIO_SD_B2_08 ALT6LPSPI2_SDO GPIO_SD_B2_09 ALT6LPSPI2_SDI GPIO_SD_B2_10 ALT63 LPSPI3_SCK GPIO_DISP_B1_04 ALT9LPSPI3_PCS0 GPIO_DISP_B1_07 ALT9LPSPI3_SDO GPIO_DISP_B1_06 ALT9LPSPI3_SDI GPIO_DISP_B1_05 ALT94 LPSPI4_SCK GPIO_DISP_B2_12 ALT9LPSPI4_PCS0 GPIO_DISP_B2_15 ALT9LPSPI4_SDO GPIO_DISP_B2_14 ALT9Table continues on the next page...NXP SemiconductorsBoot, reset, and miscellaneousHardware Development Guide for the MIMXRT1160/1170 Processor , Rev. 2, 09/2021User Guide 12 / 24