SC14CVMDECT datasheet(46/57 Pages) DIALOG

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Datasheet

Revision 3.0

28-Jul-2015

CFR0011-120-00-FM Rev 5

46 of 57

SC14CVMDECT SF

Cordless Voice Module

FINAL

8.0 Design guidelines

This section describes the software and hardware con-

siderations to be taken into account when designing

the target application.

The SC14CVMDECT SF can be used standalone or

next to an MCU that controls the module. In case the

module is used standalone the application will be

stored in its on-board Flash. In total 324 kB of Flash is

available for this purpose.

Applications can be developed with the Athena soft-

ware development environment (see reference [3]).

8.1 APPLICATION SOFTWARE FOR PP

In a PP application the following software tasks must

be handled by the MCU or within the module itself:

• UART communication (external microprocessor

only)

• PP MMI

• Display interface (optional)

• Keyboard interface (optional)

• Battery Charge interface (optional)

• Audio handling

• Tone / Melodies handling

For control commands see document reference [2].

UART communication

The UART communication is the main control interface

of the SC14CVMDECT SF.

PP MMI

The MMI state machine must handle the call setup and

call termination on the PP.

Display Interface

The MCU / PP handles the display interface including

the display driver.

Keyboard Interface

The MCU/ PP handles the keyboard interface including

the keyboard driver.

Audio handling

The Application Software state machine must control

when to open and close the audio. The headset plug-in

detection must handled by the host, and a status is

send to the PP MMI from the PP stack software. The

PP MMI must handle the volume control.

Headset detection boundaries can be adjusted in VES.

When headset indication is received from the PP

Headset detection logic, the Application Software can

decide if audio should be switched to the headset and

sends a request to the PP stack software.

The PP audio handling basically consists of 4 audio

modes (see Figure 14):

1. Idle (Alert) mode

2. Earpiece mode

3. Handsfree mode (Speakerphone)

4. Headset mode

Shifting between modes is done through the API.

Tone handling

The Application Software state machine must control

when to play tones and the volume setting. Custom

melodies can be defined in the VES.

8.2 APPLICATION SOFTWARE FOR FP

In an FP application the following software tasks must

be handled by the MCU or within the module itself:

• UART communication (external microprocessor

only)

•FP MMI

• Display interface (optional)

• Keyboard interface (optional)

• Audio handling

• Tone / Melodies handling

For control commands see document reference [1].

UART communication

The UART communication forms the basic of the FP

operation

because

via

this

interface

the

SC14CVMDECT SF is controlled.

FP MMI

The MMI state machine must handle the call setup and

call termination on the FP.

Display interface

The MCU/ FP handles the display interface including

the display driver.

Keyboard interface

The MCU/ FP handles the keyboard interface including

the keyboard driver.

Audio handling

The Application Software state machine must control

when to open and close the audio. The FP MMI must

handle the volume control.

Tone handling

The Application Software state machine must control

when to play tones and the volume setting. Custom

melodies can be defined in VES.

8.3 HARDWARE DESIGN GUIDELINES

Within this section general design guidelines for

SC14CVMDECT SF FP and PP applications are given.

8.3.1 Circuit design guidelines

For a reference schematic refer to the SC14CVMDECT

SF reference kit. With the reference kit package a non-

cost optimised reference design is presented.

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