AK4955 Datasheet, PDF (58/117 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/SPK/Cap-less VIDEO-AMP/ LDO & DSP

[AK4955]
2. BEEP Generation Circuit (BPM1-0 bits = “10”)
The AK4955 integrates a BEPP generation circuit. When PMSPK bit = “1”, the speaker amplifier outputs BEEP signal
by setting PMBPG=BEEPS bits = “1”, and the Stereo lineout amplifier outputs BEEP signal by setting PMBPG=BEEPL
bit = “1” when PMLO bit = “1”.
After outputting the signal during the time set by BPON7-0 bits, the AK4955 stops the output signal during the time set by
BPOFF7-0 bits (Figure 47). The repeat count is set by BPTM6-0 bits, and the output level is set by BPLVL3-0 bits. When
BPCNT bit is “0”, if BPOUT bit is written “1”, the AK4955 outputs the beep for the times of repeat count. When the
output is finished, BPOUT bit is set to “0” automatically. When BPCNT bit is set to “1”, the AK4955 outputs the beep in
succession regardless of repeat count, on-time and off-time. The output frequency is set by BPFR1-0 bits.
< Setting parameter >
1) Output Frequency (Table 48, Table 49)
2) ON Time (Table 51, Table 52)
3) OFF Time (Table 53, Table 54)
4) Repeat Count (Table 55)
5) Output Level (Table 56)
• BPFR1-0, BPON7-0, BPOFF7-0, BPTM6-0 and BPLVL3-0 bits should be set when BPOUT
=BPCNT bits = “0”.
• BPCNT bit is given priority in BPOUT bit. When BPOUT bit is “1”, BPOUT bit is set to “0” forcibly
by setting BPCNT bit to “0”.
• In the case that BEEP is output by BPCNT bit = “1”, after stopping the BEEP outputs by
changing BPCNT bit to “0”, writings to BPOUT bit and BPCNT bit are inhibited for 10ms.
In the case that BEEP is output by BPCNT bit = “0”, after changing BPCNT bit to “0” or BEEP
output is finished (ON/OFF time and repeat setting time), writings to BPOUT bit and BPCNT bit
are inhibited for 10ms.
BEEP Output
ON Time
OFF Time
Repeat Count
Figure 47. BEEP Output
MS1343-E-00
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2011/12