SX8663 datasheet(47/64 Pages) SEMTECH

47 / 64 page

ADVANCED COMMUNICATIONS & SENSING

Rev5 4

th August 2011

www.semtech.com

SX8663

Capacitive Button Matrix (up to 36) and Proximity Controller

with Individual LED Drivers and Buzzer Output

5.6

Buzzer Parameters

Buzzer

Parameters

Address

Name

Bits

Description

7:6

Defines the phase 1 duration.

0x00: ~ 5ms

0x01: ~ 10ms

0x02: ~ 15ms (default)

0x03: ~ 30ms

5:4

Defines the phase 2 duration.

0x00: ~ 5ms

0x01: ~ 10ms

0x02: ~ 15ms (default)

0x03: ~ 30ms

Defines the buzzer idle level (BuzzerLevelIdle).

0x0: min level (0V), (default)

0x1: max level (VDD)

0x37

BuzzerCfg

2:0

Defines the buzzer pwm prescaler value.

Default: 0x04

0x38

BuzzerFreqPhase1

7:0

Defines the frequency for the first phase of the buzzer.

freq

≈ 4MHz /(2^prescaler * BuzzerFreqPhase1)

Default: 0x40 (4KHz)

0x39

BuzzerFreqPhase2

7:0

Defines the frequency for the second phase of the buzzer.

freq

≈ 4MHz /(2^prescaler * BuzzerFreqPhase2)

Default: 0x20 (8KHz)

0x3A

Reserved

7:0

Reserved (0x00)

Table 14

Buzzer Parameters

The SX8663 has the ability to drive a buzzer (on GPIO7) to provide an audible indication that a button has been

touched. The buzzer is driven by a square signal for approximately 30ms (default). During the first phase (15ms)

the signal’s frequency is default 4KHz while in the second phase (15ms) the signal’s frequency default is 8KHz.

The buzzer is activated only once during any button touch and is not repeated for long touches. The user can

choose to enable or disable the buzzer by configuration and define the idle level, frequencies and phase

durations.

Figure 47

Buzzer behavior

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