SC14WAMDECT datasheet(15/36 Pages) DIALOG

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Datasheet

Revision 3.0

23-Jul-2015

CFR0011-120-00-FM Rev 5

15 of 36

SC14WAMDECT SF

Wireless Audio Module

FINAL

5.2.5 Accessory input/output

The accessory input (pin ACC_IN) for the microphone

(FP) and the accessory output (pin ACC_OUT) for the

loudspeaker (PP) are supported as shown in Table 8.

5.2.6 API (Tour Guide mode only)

The SC14WAMDECT SF software has a simple API to

control the module from an external host processor.

The API supports the following basic functions for Tour

Guide mode operation:

• Registration on/off

• Set/get access code

• Mute/unmute audio

• Get status (Registration mode/Audio/Mute/Low bat-

tery)

• Data transfer up to 1 kbit/s from FP to PP

5.3 REGISTRATION

The procedure for FP-to-PP pairing is the same for

Public Address mode and Tour Guide mode:

1. Turn off PP and turn on FP.

2. Set 6-bit access code via pins ACCESS_0 to

ACCESS_5. Do not change during registration.

3. FP: Press and hold PON button (pin 23) for 2 s,

until the red LED1 starts flashing.

4. PP: Press and hold PON button (pin 29) for 2 s,

until red LED1 starts flashing.

5. When flashing stops and the red LEDs are con-

tinuously on, registration has succeeded.

5.4 DEREGISTRATION

The procedure for FP-to-PP unpairing is the same for

Public Address mode and Tour Guide mode:

1. Turn off FP.

2. FP: Press and hold PON button (pin 23) for 10 s.

3. The red LED1 will flash 3 times (0.5 s interval)

and all registrations will be cleared.

5.5 BATTERY LOW DETECTION

The SC14WAMDECT SF includes a battery low detec-

tion circuit. A battery low condition is indicated by a

flashing green LED.

• Battery low voltage: 2.3 V (default)

5.6 ANTENNA OPERATION

Figure

shows

the

internal

circuit

the

SC14WAMDECT SF.

Pin RF0 is used for two external antennas and can also

be used for RF test purposes. Therefore it is recom-

mended to add a reserve pattern for a 10 pF capacitor,

even when the two external antennas are not used.

Re-certification of the SC14WAMDECT SF is required

when at least one external antenna is added. On

request, Dialog Semiconductor can provide a pre-certi-

fied PCB layout for an external antenna circuit.

Pin RF1 is recommended for connecting an RF cable

to perform conducted tests for type approval.

5.6.1 Internal antenna only

When only the internal antenna is used, the FAD func-

tion is disabled. In this case pins RFP0, RFP0n, P0

and P0n must be left unconnected.

5.6.2 Internal and external antenna with FAD

Figure 7 shows one external antenna connected to pin

RF1 of the SC14WAMDECT SF. This configuration

supports the FAD function. In this case pins RFP0,

RFP0n, P0 and P0n must be left unconnected. See [1]

for more detailed information.

Table 8: Accessory I/O function table (TG mode)

ACC_IN (FP)

ACC_OUT (PP)

Figure 6: Internal circuit of the SC14WAMDECT SF

Figure 7: One external antenna

RF1

TP1

RF0

P0n

RFP0n

RFP0

External

Antenna

RF1

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