Theory of Operation
: Controller
3-29
3.2.2.1.4 Power-up Timing
The powering up of the radio starts with the MAKO. Once the radio knob is pressed 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 than activates it 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 3-18
.
Figure 3-18. 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 APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......