3-28
Theory of Operation
: Controller
3.2.2.1.4 Power-up Timing
The powering up of the radio starts with the MAKO. Once the radio switch is pushed to 'ON' and
battery voltage is supplied, a pass FET is activated to deliver battery voltage to MAKO and external
regulators. The external 3.6 V is first turned on then MAKO activates its 24.576 MHz clock, and the
remaining regulators begin to turn on. Once all the regulators have turned on, MAKO releases its
reset. The CPLD is then powered on from the 1.875 V external regulator and takes MAKO 24.576
MHz clock and divides it to 32.768 kHz in order to provide for OMAP. OMAP starts to power up upon
receiving voltages 1.4 V, 1.85 V, and the 32.768 kHz clock. OMAP then activates its 12 MHz clock
and releases its reset. It then starts to run the boot loader stored in flash. A more detailed timing view
of the regulators is shown in
Figure 3-20
.
Figure 3-20. Power-up Timing Regulators
fet_en
20ms
1ms
210us
1ms
252us
210us
210us
210us
1ms
2ms
1ms
1ms
1ms
1ms
14ms
1ms
4ms
41.6us(1024clk24)
rcosc
sw1_enldo
sw1_en
sw1_boost_slimit
clk24_cnten
clk24_val
clk24
sw1_clk
sw2_clk
sw2_ondc
sw2_softstart[0]
sw2_softstart[1]
sw2_softstart[2]
v9_on
v4_on
v3_on
v8_on
v2_on
v6_on
v7_on
v10_on
sys_rstx
rcosc_en
Summary of Contents for Astro APX 3000
Page 1: ...APXTM TWO WAY RADIOS APX 3000 DETAILED SERVICE MANUAL ...
Page 2: ......
Page 4: ...Notes ...
Page 6: ...vi Document History Notes ...
Page 10: ...x Table of Contents Notes ...
Page 12: ...xii List of Tables Notes ...
Page 18: ...xviii List of Figures Notes ...
Page 22: ...xxii CommercialWarranty Notes ...
Page 46: ...3 20 Theory of Operation Main Board Notes ...
Page 84: ...3 58 Theory of Operation Bluetooth Notes ...
Page 208: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 222: ...7 14 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 282: ...8 60 Schematics Boards Overlays and Parts Lists Main Board Block UHF1 84012513001_A Notes ...
Page 390: ...8 168 Schematics Boards Overlays and Parts Lists Main Board Block VHF 84012512001_A Notes ...
Page 456: ...9 8 Debugging Fixture Powering up Covert Board Notes ...
Page 468: ...Glossary 10 Glossary Notes ...
Page 472: ...Index 4 Index Notes ...
Page 473: ......