[AK4634]
■ BEEP Generate
The AK4634 generates and output square wave from speaker amp. After outputting the signal during the time set by
BPON6-0 bits, the AK4634 stops the output signal during the time set by BPOFF6-0 bits (Figure 46). 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 AK4634 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.
DATT2
SMUTE
DAC
Line Out Amp
Class-D SPK-Amp
BEEP
Generator
LPF
Figure 45. BEEP signal output path
BEEP Output
ON Time
OFF Time
Repeat Count
Figure 46. Beep output
Rev. 0.5
2007/10
- 53 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
