6881094C31-E
November 16, 2006
: VOCON Board
3-41
The dual-core processor selects whether the amplified audio is routed to the internal speaker or the
external speaker through the SPI lines based upon which amplifier is turned on as shown in the PA
control block. The output audio is routed on Mako IC pins INT_SPKR_P and INT_SPKR_M for
internal and EXT_SPKR_P and EXT_SPKR_M for external speaker lines.
Figure 3-16. VOCON Receive Audio Path (for kit NNTN5567)
3.2.6
Radio Power-Up/Power-Down Sequence
The radio power-up sequence begins when the user closes the radio On/Off switch on the control
top, placing 7.5 Vdc on the B+SENSE line. This voltage enables the pass element Q501 and Q502,
enabling SW_B+ and . In NNTN5567 VOCON kit, the B+SENSE line enables the pass
elements Q500, Q501, and Q503 enabling SW_B+ and .
When the GCAP II IC U501 detects a low-to-high voltage transition on , it turns on and
enables voltage supplies VSW1, VSW2, V2 and Vref. As soon as these voltages come up, the
1.55 V regulator ramps up (only on the NNTN4717 VOCON board), and the Flipper IC U301 drives
the WDI line high to enable VCC5 from regulator U505 and to maintain the GCAP II IC in the ON
state. If WDI remains low, the GCAP II IC turns off 50 ms after turning on. For NNTN5567 VOCON
board, when the MAKO IC U501 detects a high-to-low transition on the MECH_SW pin, the MAKO
IC grounds the FET_ENX pin driving the gate of an external P-MOSFET low. This turns on the
transistor (Q500) and applies SW_B+ to the MAKO IC and the rest of the board (RF and VoCon).
After applying power to SW_B+, the regulators VSW1, VSW2, V1.875, V1.55, V_2.9, and VCC5 are
sequenced on. After the regulators are stable, the RESETX pin is asserted low for an additional
16ms and then de-asserted allowing the dual-core processor to start.
ABACUS III
U500
(On RF Board)
Digital
LPF =
3.4 kHz
CODEC
16-Bit
D/A
G1 Digital
Gain = 0 or
1 dB
G3
Attenuator
= -52 to 0
dB
PA
Control
G4
Preamp =
0 to 10
dB
G5
EXT PA
=26 dB
G6
INT PA
=26 dB
HP & LP
Filter = 22
kHz, 200
Hz
Internal
Speaker =
28 ohms
External
Speaker
Patriot
SPIB
Patriot
SAP/ BBP
MAKO IC U501
PA_IN_M
PA_IN_P
VC_OUT_P
CODEC_RX
CODEC_DCLK
CODEC_FSYNC
SPI_MOSIB
SCKB
MAKO_CS
SPI_MISOB
RX_SSI_FSYNC
RX_SSI_CLK
RX_SSI_DATA
VC_OUT_M
3
3
4
Summary of Contents for ASTRO XTS-5000
Page 7: ...vi Table of Contents November 16 2006 6881094C31 E Notes ...
Page 11: ...x List of Figures November 16 2006 6881094C31 E Notes ...
Page 17: ...November 16 2006 6881094C31 E xvi CommercialWarranty Notes ...
Page 31: ...November 16 2006 6881094C31 E xxx Portable Radio Model Numbering System Notes ...
Page 83: ...November 16 2006 6881094C31 E 3 44 Theory of Operation Encryption Module ...
Page 135: ...November 16 2006 6881094C31 E 5 44 Troubleshooting Charts Secure Hardware Failure Notes ...
Page 175: ...November 16 2006 6881094C31 E 7 32 Troubleshooting Tables List of Board and IC Signals Notes ...
Page 367: ...November 16 2006 6881094C31 E Glossary 10 Notes ...
Page 373: ...Index 6 November 16 2006 6881094C31 E Notes ...