User Interface Board; Power Supplies - E.F. Johnson Company 5100 ES Series Service Manual

Circuit Description
5.4

User Interface Board

This section provides a functional description of the 5100 ES Portable Radio User
Interface board (P/N 023-5500-480/485).
Related Documents
• Schematic, 5100 ES UI Board, P/N 025-5500-480/485
• Schematic, 5100 ES Logic Board, P/N 025-5500-180/185
• MPC885 PowerQUICC Family Reference Manual, Freescale Document
MPC885RM.PDF
• Firmware, CPLD, 5100 ES UI, P/N 049-0088-200
• TMS320VC5510 Fixed-Point Digital Signal Processor, TI Document
TMS320VC5510.PDf
• HCS08 Microcontrollers, Freescale Document MC9S08GB60.PDF
Functional Description
A functional description of the UI Board is provided in the following paragraphs. A block
diagram of the UI Board is shown in Figure 5.3.
5.4.1
All power used by the UI Board is provided by voltage regulators located on the Logic
Board. The six supply voltages are as follows:
• 5Vdc (SW_VD5_0) – power for keypad backlights, LCD backlights, and transmit/
receive LED
• 3.3Vdc (UNSW_VD3_3) – SRAM
• 1.8Vdc (SW_VD1_8) –MPC870, FLASH, and CPLD core voltage
• 3.3Vdc (SW_VD3_3) – Supply for digital I/O, HC08, and discrete logic devices
• 5Vdc (SW_VA5_0) - analog supply
• Battery(SW_BATT) – Accessory Connector (J1), speaker audio PAs
5-14 5100 ES Series Portable Radio Service Manual

Power Supplies

January 2007