This application note describes how to design a printed circuit board (PCB) with optimum performance and compatibility between ST92E196 or ST92T196 (SDIP56 package) and ST92186 (SDIP32 and SDIP42 packages) microcontrollers. It also describes the external filters and components needed for the ST92186 family of microcontrollers (MCU), and provides advice on how to develop applications for ST92186 microcontrollers in SDIP32 or SDIP42 packages using ST92E196 / ST92T196 devices.
This document outlines the hardware design requirements for printed circuit boards (PCB) using STMicroelectronics ST92186 and ST92196 microcontrollers. It focuses on ensuring optimal performance and compatibility between these devices, specifically addressing ground plane layout, power supply line separation, and pin configuration.
| Power Supply Voltage Range | +5V +10% |
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All unused I/O pins must be initialized as Bidirectional Weak Pull Up (default state after reset) and associated with a '0' in their data register.
All the pull-up resistors of the ST92196/186 I2C line must be connected to the +5V power supply line.
No, in order to provide a stable frequency for data slicing and OSD functions, the crystal oscillator must not be substituted by an external oscillator.