Description - Intermec EasyCoder PX4i Service Manual

Chapter 15 — CPU Board

15.1 Description

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The CPU board is a four-layer board with most of its circuits surface-
mounted. Inside the laminate are a combined VCC layer (5V/3.3V/2.5V)
and a GND layer. The front and back sides are signal routing layers.
The hardware contains of the following main functions:
• Processor core
• Thermal printhead driver
• Stepper motor control logic
• Sensor drivers
• Communication, such as UART, USB, etc.
• Flash memory SIMM for the fi rmware and non-volatile storage
• SDRAM SIMM for working memory
• A/D converter for sensor adjustment, etc.
• Compact Flash memory card expansion
• Expansion bus
• PCI bus (custom)
1-971630-26 CPU board; Block Diagram
(numbers refer to schematics in Chapter 15.7)
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