User's Manual

MODEL 2130 MARKER BEACON
Rev. A April, 2005 2-7
This document contains proprietary information and such information may not be disclosed to others for any
purposes without written permission from SELEX Sistemi Integrati Inc.
Microcontroller
with Watchdog,
DMA, and Serial
Port.
Oscillator
Flash ROM
NVRAM
Real Time
Clock with
BBU
Voltage
Supervisor /
Reset
D-A
Converter
Active Filter
Marker
Beacon Test
Signals
SDRAM
Eight Uarts
TTL / RS232
Converters
J1 Conn (DB37)
BCPS/FFM1/FFM2
J2 Conn (60 Pin Hdr)
LCU
J3 Conn (DB25)
Marker Beacon 1
J4 Conn (DB25)
Marker Beacon 2
J5 Conn (DB9)
RCSU Radio/Cell
Modem
J6 Conn (DB9)
PMDT External
Modem
J7 Conn (USBB)
PMDT USB
J8 Conn (14 Pin Hdr)
Emulator
J9 Conn (10 Pin Hdr)
SPI Boot
Config
Switches
LCU Parallel
Port Bus
Ident
Multiplexor
Amplifier /
Speaker
16-1
Multiplexor
16-1
Multiplexor
A-D
Converter
J10 Conn (50 Pin Hdr)
Test
TB1 (13 Pos Block)
GP I/O1
TB2 (13 Pos Block)
GP I/O2
JP4 Conn (4 Pin Hdr)
PMDT RS232
JP6 Conn (4 Pin Hdr)
Debug RS232
Socketmodem: PMDT
Dial-up
Socketmodem: RCSU
Dedicated
+3.3V, +5V, +/- 15V,
+/- 12VA, +/-12VD
Supplies
VDC Raw
USB / TTL
Converter
Figure 2-2 Marker Beacon RMS CCA Block Diagram
2.3.2.2 Marker Beacon RMS CCA Detailed Circuit Theory
Refer to Figure 11-15. Battery-backed DC power in the range of +10.4VDC to +15VDC enters the RMS CCA on J1-19 and
J1-17 and is diode-OR’D by CR3 and CR4 to create RADIO_V+. RADIO_V+ is directly regulated to +3.3VDC by DC-DC
converter PS1 and can be measured on test point TP7. The voltage level of RADIO_V+ is lowered by CR8, CR9, and CR10
before regulation by DC-DC converter PS3, creating +15V and -15V which can be measured on TP15 and TP16.
The -15V output of PS3 is filtered by C44, L5, and C53 before regulation to -12ANA by U10 and is measurable at TP4. The
-15V is also directly regulated to -12DIG by U13 and is measurable at TP5.
The +15V output of PS3 is filtered by C54, L6, and C56 before regulation to +12ANA by U11 and is measurable at TP6.
The +15V is also directly regulated to +12DIG by U14 and is measurable at TP8. The +12DIG is further regulated to +5DIG
measurable at TP9.
The last power supply for the RMS is 1.2V and can be measured at TP3. The U8 microcontroller generates a pulse-width-
modulated (PWM) signal at U8-4 and U8-5 which drives transistor Q1. Diode CR2, inductor L1, and capacitor C37
complete the DC-DC converter which creates the +1.2VDC used for powering the core of the U8 microcontroller.
The U8 microcontroller accesses its program from U1 and U2 flash ROM. System variables are stored in U3 NVRAM.
Further storage and execution area is available in the U4 SDRAM. Clock Oscillator Y2 generates the heartbeat for the U8
microcontroller as well as the U25 and U20 UARTs. Voltage/reset supervisor U7 monitors +3.3V and resets U8 if +3.3V
drops too low or if an external reset from the LCU enters via J2-31.