May 25, 2005 6881096C74-B
3-66 Theory of Operation: Controller Section
The various voltages used by the ICs on the main board are shown in Table 3-13.
3.8.3 Encryption Voltages
The secure interface board produces two voltages sourced by A+ and SW_B+ through J0501, pins
10 and 9, that are used by the encryption module: UNSW_B+_ENC (7 V) and SW_B+_ENC (7 V).
The constant 7 V is generated using U800, Q802, and Q803 and is fed to J0701. At the secure
interface board, the 7 V provides continuous unswitched voltage when the vehicular battery is
connected to the radio and is also switched to provide SWB+ to the encryption module. A 5-V
storage circuit, C810 (0.47-farad capacitor), provides +5 Vdc to the encryption module via J0701, pin
12, to hold encryption keys for a period of three days with no A+ voltage present. The 5 V and 2.85 V
controller supplies are used to provide logic translation between the legacy keyloader data (5 V) and
the universal crypto module (UCM) (3 V). The secure interface board also supplies the UCM chip-
select logic line and the other control lines, clocks, and other components, to the main board
microprocessor.
Table 3-13. Integrated Circuits Voltages
Integrated Circuit UNSW5V SW 5V A+ 3.0 V 2.85 V
9.3 V_T
X
1.85 V 1.55 V
Patriot
Microprocessor
U100 U100 U100
Flash U102
SRAM U103
A/D U0953-28
D/A U0959-4
Modulation D/A U0900-3
FL0900-4
Urchin U0901
RS-232 XCVR U0305-16
USB XCVR U0304-7
Audio PA U0204-7
CODEC U200-6
Amplifiers, EPOTs U0201-4
U0202-3
555 Timer U0506-4
SB9600 MUX U606-16
Volume Pot U0206-7
32K Crystal Y0100-5
Modulation MUX U0902-16
Power Control U0956-4
U0957-4
U0960-4
Keyed 9.1 V Switch Q0952
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