AK4635 datasheet(55/81 Pages) AKM

55 / 81 page

[AK4635]

Rev. 0.6

2007/10

- 55 -

■ BEEP Generate

The AK4635 generates and output square wave from speaker amp. After outputting the signal during the time set by

BPON6-0 bits, the AK4635 stops the output signal during the time set by BPOFF6-0 bits (Figure 50). The repeat count is

set by BPTM6-0 bit, and the output level is set by BPLVL2-0 bits. When BPCNT bit is “0”, if BPOUT bit is written “1”,

the AK4635 outputs the beep for the times of repeat count. When the output finish, BPOUT bit is set to “0” automatically.

When BPCNT bit is set to “1”, it outputs the beep in succession regardless of repeat count, on-time and off-time.

< Setting parameter >

1) Output Frequency ( Table 38 ~ Table 40)

2) ON Time (Table 41)

3) OFF Time (Table 42)

4) Repeat Count (Table 43)

5) Output Level (Table 44)

BPFR1-0, BPON7-0, BPOFF7-0, BPTM6-0 and BPLVL3-0 bits should be set when BPOUT =BPCNT

= “0”.

BPCNT bit is given priority in BPOUT bit. When BPOUT bit be set to “1”, if BPCNT bit is set to “0”,

BPOUT bit is set to “0” forcibly.

DAC

Line Out Amp

BEEP

Generator

Class-D SPK-Amp

DATT2

SMUTE

LPF

Figure 49. BEEP signal output path

BEEP Output

ON Time

OFF Time

Repeat Count

Figure 50. Beep output

AK4635 Datasheet(PDF) 55 Page - Asahi Kasei Microsystems