3-26
Theory of Operation
: Controller
3.2.2.1 DC Distribution Major Components
The controller's DC section is made up of MAKO and external regulators. This section will give an
overview of the schematics and circuitry that makes up the major supplies of the DC architecture.
3.2.2.1.1 MAKO
MAKO (U6501) is a custom power management IC manufactured by Atmel. MAKO controls almost
all of the LDO supplies to the controller.
Table 3-3
illustrates all of MAKO's LDO and the supplies that
feed them.
Figure 3-15
shows all of MAKO's LDOs their voltage level and components that can be
accessed to verify operation.
Figure 3-15
also shows where the battery supply and on off switch can
be accessed. MAKO is also responsible for the timing sequence for the enabling of the regulators
which is discussed further in
section 3.1.3.7.1
and
section 3.1.3.7.2
.
Table 3-3. MAKO’s LDO and Supplies
Name
Ref
Description
Level
ON_OFF_SWITCH
MAKO_IGN_X
ON/OFF Switch. Radio on when GND
GND
F
Radio Battery Voltage
6–9V
SW_B+
C6593
Radio Supply Voltage
6–9 V
V_SAVE
C6538
LDO Output Present When Battery is Attached
2.5 V
V_1.875
C6581
LDO Output
1.875 V
V_1.55
R6561
LDO Output
1.55 V
V_2.775D
R6563
LDO Output
2.775 V
V_2.775_EXP
R6562
LDO Output
2.775 V
V_2.8_RF
R6564
LDO Output
2.8 V
V_5.0A
R6565
LDO Output
5.0 V
V_3.3
R6566
LDO Output
3.3 V
V_3.0A
R6567
LDO Output
3.0 V
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: ......