3-36 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 3-5 illustrates all of MAKO's LDO and the supplies that
feed them. Figure 3-25 shows all of MAKO's LDOs their voltage level and components that can be
accessed to verify operation. Figure 3-25 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 3.1.3.7.3 on pages 3-20 and 3-21.
Table 3-5. MAKO’s LDO and Supplies
Name Ref Description Level
MECH_SW F_MECH_SW ON/OFF Switch. Radio on when GND GND
UNSW_B+ F_UNSW_B+ Radio Battery Voltage 6 V – 9 V
SW_B+ R6505_6 Radio Supply Voltage 6 V – 9 V
V_SAVE C6538_6 LDO Output Present When Battery is Attached 2.5 V
VCC_1.875 C4001_4 LDO Output 1.875 V
VCC_1.55 R6561_6 LDO Output 1.55 V
VCC_2.775D R4011_4 LDO Output 2.775 V
VCC_2.775 R6563_6 LDO Output 2.775 V
VCC_2.8 R6564_6 LDO Output 2.8 V
VCC_5.0A R6565_6 LDO Output 5.0 V
VCC_3.3 R6566_6 LDO Output 3.3 V
VCC_3.0A R6567_6 LDO Output 3.0 V
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