Posted on May 17, 2011 at 13:24The circuit you attached is designed specifically for LED drive. It doesn't regulate output voltage, instead it regulates output current. The ''output'' is across the LED and is not referenced to the circuit ground. Al...
Posted on May 17, 2011 at 13:24Does the SCL line toggle at all (is there an I2C clock?) Also, what is the state of the SCL and SDA lines - high or low? If one or both are low I would check the pull-up resistor and make sure it is well soldered. It c...
Posted on May 17, 2011 at 13:19I have an application where I need 3 SPI master ports. I'm using the STM32F103RE. Since the SPI3 pins are shared with the JTAG port, SPI3 is useless to me. I'm using SPI1 and SPI2 as SPI masters, and USART3 in synchron...
Posted on May 17, 2011 at 13:14Well, there's always the brute force method: use an I/O pin with a little bit of external circuitry to pull down the external reset line. Once the chip goes into reset the I/O pin will revert to a high impedance input ...
