80-0206-R datasheet(29/49 Pages) ETC1

29 / 49 page

Data Sheet

RSC-4128

P/N 80-0206-R

Because it is intended to “listen” continuously at very low power levels, the Audio Wakeup unit must detect each of

these events without any processor interaction. The processor configures and enables the unit under program

control before going into Idle mode. Audio Wakeup is not available in Sleep mode because the unit requires the

CLK2 signal. The detection signal from the Audio Wakeup unit can trigger a wakeup event, which starts the

processor and allows further audio processing. The processor inputs to the Audio Wakeup are an enable signal and

control signals to select for which sound to listen. See schematic 1-3 for details on this implementation.

Schematic 1-3

1N4148

.01

1.8K

220uF

2.2uF

3300pF

NOTE 2

270

(Px.n is any available port

I/O pin)

1N4148

C10

.01

Px.n

Vdd

270

NOTE 3

AVdd

.047

Example using one

microphone for normal

operation only

1N4148

NOTE 4

RSC-4x

220uF

C11

.01

1N4148

Px.n

NOTE 6

AVdd

NOTE 7

NOTE 6

MK1

MICROPHONE

NOTE 7

Recommended

RSC-4x

Vdd

510

NOTE 2

2.2uF

1uF

NOTE 3

BT1

NOTES:

1. Optional. This capacitor MAY reduce noise

coupled into the

mic input on a noisy PCB.

2. If used, this capacitor MUST be placed

close to the

RSC-4128 AGND and MIC1IN pads.

3. Place close to MICIN1.

4. These capacitors may be used to reduce high frequency

response. The tradeoff is reduced amplitude.

5. For reducing system ESD susceptibility.

6. Typical value. Refer to Sensory Design Note 80-0259

"Selecting a Microphone" to determine proper value for your

application

7. SETTING RESISTOR AND CAPACITOR VALUES IN THE MICROPHONE

POWER LINE FILTER CIRCUIT:

The capacitor value should be between 220 and 30 ufd.

The resistor value should be between 300 and 2000 ohms.

Within these ranges;

Select the largest capacitor consistent with other

constraints (cost, size,etc.)

For this capacitor, select a resistor such that the RC

time constant is ~60msec.

* Refer to Sensory Design Note 80-0073 "Speech Recognition

Hardware Design" for information on proper microphone

selection and housing design, PCB layout, as well as test and

evaluation procedures to verify proper design and operation.

* Sensory offers a FREE Design Review Service. Detatils of

this service are also included in 80-0073.

510

1N4148

NOTE 5

Recommended

AVdd

1.8K

Vdd

1N4148

NOTE 5

NOTE 7

Example using one microphone for

both Audio Wakeup and normal

operation

3300pF

NOTE 1

MK1

MICROPHONE

NOTE 7

510

NOTE 1

1uF

(Px.n is any available port

I/O pin)

The RSC-4128 FluentChip™ library contains routines for detecting each of the four audio events listed above.

These routines also manage powerdown appropriately. See the “FluentChip™ Technology Library Manual” for

reference code to invoke these routines.

Microphones

A single electret microphone may be used both for the analog front-end input (for recognition purposes) and as the

sound source for the Audio Wakeup unit. The current consumption and frequency response requirements are

different for the two uses, so two microphone input pads are provided: MICIN1 for the normal recognition input to

the analog front-end, and MICIN2 for the Audio Wakeup analog front end. A common microphone ground is used

for both the normal recognition analog front-end and the Audio Wakeup analog front end.

During normal recognition and Audio Wakeup operation, the microphone would typically be powered from a source

with an impedance in the range of 1-3 Kohms. If both the normal recognition and Audio Wakeup front ends are

used, they must be isolated from each other by capacitors and may share one microphone and microphone bias

circuit. The switching of the microphone input source is under program control.

See schematic 1-3 for details on

this implementation.

The recommended value for the microphone filter capacitor (labeled “C5” in Schematic 1-3) is in the range of 33uF-

220uF. Using a capacitor at the upper end of this range will reduce low frequency noise. Low frequency noise on

the microphone input typically won’t affect recognition, but could affect the quality of speech playback when using

Record and Playback technology in an application. (see the “FluentChip™ Technology Library Manual” for more

information on Record and Playback) Typical low frequency noise sources include 60 Hz hum, “motor boating” or

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