3-28 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 3-19 shows all of MAKO's LDOs their voltage level and components that can be
accessed to verify operation. Figure 3-19 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.
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
ON_OFF_SWITCH** MECH_SW ON/OFF Switch. Radio on when GND GND
UNSW_B+ F_UNSW_B+ 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
Note:
* = Not applicable to APX 2000/ APX 4000 (Two Knobs).
** = Applicable to APX 2000/ APX 4000 (Two Knobs) only.
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