Part # Application Note Television ST92186B ST92196A ST92T196 8-bit MCU for TV AN1857 datasheet

Part Manufacturer: ST Microelectronics

ST Microelectronics

Part Description: PCB Layout and PCB Compatibility for ST92186 and ST92196 Devices


Part Details:

AN1857 APPLICATION NOTE TV HARDWARE DESIGN RULES, PCB COMPATIBILITY WITH ST92196/186 1 INTRODUCTIONThe purpose of this note is to: 1. Describe how to design a printed circuit board (PCB) with optimum performance and compatibility between ST92E196 or ST92T196 (SDIP56 package) and ST92186 (SDIP42and SDIP32 packages) microcontrollers. 2. Describe the external filters and components needed for the ST92186 family of microcontrollers (MCU). 3. Provide advice on how to develop applications for ST92186 microcontrollers in SDIP42 or SDIP32 packages using ST92E196 / ST92T196 devices. Obsolete Product(s) - Obsolete Product(s) Rev. 2 AN1857/0704 1/16 AN1857 - APPLICATION NOTE 2 GROUND PLANE & POWER SUPPLY LINES 2.1 Ground Plane A local ground plane must be placed under the entire area of the ST92196/186 component andconnected using the widest possible line to the PCB ground as shown in Figure 1, Figure 2and Figure 3 This plane and its associated lines are dedicated to the ST92196/186 MCU. It isstrongly recommended not to connect any other lines from components not already connectedto the ST92196/186 to this plane. This is to avoid adding any impedance or analog disturbanc-es which could cause the IC ground to float. All ground pins for the ST92196/186 (VSS1 and VSS2) and external components (PLL, Crys-tal,...) must be connected to this ground plane. Ground pins VSS1 and VSS2 must be connected as close as possible to each other on theprinted circuit board. 2.2 Power Supply Lines 2.2.1 Digital and Analog Power Supplies Two different power supply lines are required for the ST92196/186: one Analog power supply line for the VDDA pin. one Digital power supply line (pins VDD1 and VDD2 (only on ST92196)). These power supply levels must be within the +5V ±10% range with |VDD-AVDD| < 600 mV. The supply pins must be decoupled as shown in Figure 1, Figure 2 and Figure 3. Decouplingcapacitors must be set as close as possible to the IC supply pins. An inductive component, with a low serial resistance, must be placed close to the decouplingcapacitors to provide high impedance and to improve noise filtering. This component is re-quired on both: the VDDA power supply pin to prevent noise disturbances from the PCB power source. the VDD power supply pins in order to prevent disturbances from being sent towards the PCB power source and other ICs. The VDD and VDDA lines must be dedicated to the ST92196/186. Any other connectionsbetween other IC supply pins and the VDD and/or VDDA lines are not recommended.This does not include MCU Reset circuitry. (See Figure 1, Figure 2 and Figure 3). All other components must be connected to the +5V power supply and not to the ST92196/186VDD or VDDA lines. Obsolete Product(s) - Obsolete Product(s) 2/16 AN1857 - APPLICATION NOTE Figure 1. Ground Plane and Power Supply Lines for ST92196 GND +5V Other connections possible VDD 10uH VDDA (Other connections not recommended) 10uH 10uF 10uF 10uH + + 100nF 100nF ST92196


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Application Note Television ST92186B ST92196A ST92T196 8-bit MCU for TV AN1857.pdf Datasheet