Bose 3-2-1GS Series II Manual de solución de problemas - Página 20
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2.1 Interface connector and cable descriptions
The 13-pin interface connector is wired in a one-to-one fashion with the console connector.
The pins/signals are as follows:
Pin Number
1
2
3,11
4
5
6
7
9,8
12,10
13
Shell
2.1.1 Smart Speaker
This is a single-wire 4800 baud, half duplex connection. It operates on an open-collector prin-
ciple and follows the hardware and software protocol defined by the SmartSpeaker interface
specifications. It operates similar to RS-232, but with a 0-3.3/5V level and positive logic.
2.1.2 MUTE Control
This is a positive logic control input to the Powered Speaker. Asserting this line (+3.3V) forces a
hardware mute of the power amplifiers. This input is internally pulled logic high in the Powered
Speaker and the input must be pulled to logic low by the console to allow audio to be heard.
2.1.3 S/PDIF
The S/PDIF input is a fully differential input which is terminated by a pair of back-to-back diodes
only. Supported sample rates are 44.1 kHz and 48 kHz.
2.1.4 Analog Audio Input
The analog audio inputs are fully differential with an input impedance of approximately 10k
ohms. The full scale input is 2.0Vrms.
2.1.5 DSP_SHUTDOWN
This is a positive logic control input which, when asserted logic high, shuts down the SMPS
feeding the entire DSP and signal processing path. It is not implemented (via depopulated
components) in the production design.
2.1.6 Vunreg
This is a DC supply which provides unregulated power for use by the console. Approx. 30W
peak is available from this supply. It is internally fused at 4A.
THEORY OF OPERATION
Signal Description
Vunreg
GND
SPDIF +/-
Mute
DSP_Shutdown
AGND
DGND
Audio Left +/-
Audio Right +/-
SmartSpeaker
SGND
Wire Type/Gauge
#20AWG
#20AWG
#28AWG twisted pair
#28AWG
#28AWG
#28AWG Drain/shield over Audio Right & Left
#28AWG Drain/ shield for SPDIF+/-
#28AWG twisted pair
#28AWG twisted pair
#28AWG
Overall tin-copper braid shield
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