STM805LM6F datasheet by STMicroelectronics

STM805LM6F Frequently Asked Questions (FAQs)

• What is the recommended power-on sequence for the STM805LM6F?
  The recommended power-on sequence is to first apply the voltage to the VDD pin, followed by the voltage to the VDDA pin. This ensures that the internal regulators are properly powered up and stabilized before the device becomes operational.
• How do I configure the clock tree for optimal performance?
  The clock tree should be configured to use the highest frequency clock source available (e.g. HSE or PLL) and to enable the clock gating feature to reduce power consumption. Additionally, the clock prescalers should be set to the optimal values for the specific application.
• What is the maximum allowed voltage on the GPIO pins?
  The maximum allowed voltage on the GPIO pins is 3.6V, which is the absolute maximum rating. However, it is recommended to keep the voltage below 3.3V to ensure reliable operation and to prevent damage to the device.
• How do I implement a reliable reset circuit for the STM805LM6F?
  A reliable reset circuit can be implemented using an external reset IC (e.g. STM811) or by using a simple RC circuit with a capacitor and a resistor. The reset signal should be connected to the NRST pin and should be able to hold the device in reset for at least 10ms.
• What is the recommended layout and routing for the power supply pins?
  The power supply pins (VDD and VDDA) should be connected to a solid power plane with a low impedance path to the power source. The decoupling capacitors should be placed as close as possible to the power pins and should have a low ESL and ESR. The power supply lines should be routed away from sensitive analog signals to prevent noise coupling.