Datasheet

RGB LED
Freedom FRDM-KV31F Development Platform User’s Guide, User's Guide, 0, 02/2016
10 Freescale Semiconductor, Inc.
associated divider chain uses different resistors. This makes the voltage across the thermistor larger or
smaller, and provides the ability to try the different gain settings on the analog channels. The thermistor
circuit is designed to provide useable differential inputs over the temperature range of 90˚ C to -20˚ C.
In addition to the thermistor voltage divider chain, the thermistor has a 0.1 uF capacitor in parallel.
Each analog input to the KV31 has a 100-ohm series resistor and a 2200 pF capacitor as a low-pass
filter. This helps protect the KV31 from electrostatic discharge, and lowers the impedance of the analog
signal so that it can be sampled with less noise.
Figure 7. Thermistor
8. RGB LED
RGB LED is connected through GPIO, and signal connections are shown in the following table.
Table 4. LED Signal connection
RGB LED
KV31
RED
PTD1/ADC0_SE5B/SPI0_SCK/UART2_CTS/FTM3_CH1/FBA_CS0/LPUART0_CTS
BLUE
PTE25/ADC0_SE18/FTM0_CH1/I2C0_SDA/EWM_IN
GREEN
PTD7/UART0_TX/FTM0_CH7/FTM0_FLT1/SPI1_SIN