3-38 Theory of Operation: Controller
3.2.6 User Interface
3.2.6.1 Top Control
The Top Control contains an ON/OFF switch and a programmable push button. The Top Control
also includes a TX/RX LED that is solid amber upon receive, red on PTT, and blinks amber on
secure RX and Bluetooth LED. The Top Control components are mounted on flex which connects to
the Main board connector J1 and J2.
When the On/Off switch is pushed to ON (green), the switch is grounded and Mech_Sw is pulled low.
Mech_Sw is an input to MAKO (U6501). The logic low input enables an external FET (Q6501) gate
voltage, FET_ENX, which switches UN_SW_B+ to SW_B+ and turns the radio on.
The programmable Top Button is by default used for Bluetooth on/off. It is also biased to
1.875 V (R6507) and is an input (EMERG_BTN_X) to the CPLD and MAKO. A button press is
detected when EMERG_BTN_X is pulled low.
Figure 3-30. Control Top Block Diagram
CPLD
Programmable
Top Switch
ON/OFF Switch
MAKO
TX/RX LED
BT LED
Intelligent
Lighting
TOP CONTROL Main Board
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