AK4951AEN Datasheet, PDF (100/105 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

[AK4951A]
■ Beep Signal Output from Speaker Amplifier
LOSEL bit
(1)
Don’t care
(Addr:01H, D0)
PMBP bit
(Addr:00H, D5)
PMSL bit
(Addr:01H, D1)
BEEPS bit
(Addr:12H, D5)
(2)
(3)
(4)
SLPSN bit
(Addr:02H, D7)
SPP pin
Hi-Z
(6)
(7)
(5)
Normal Output
Hi-Z
Example: SPKGain = +6.4dB
(SPKG1-0 bits = “00”)
(1) Addr:01H, Data:00H
(2) Addr:00H, Data:60H
Addr:01H, Data:02H
(3) Addr:12H, D5 bit = “1”
(4) Addr:02H, Data: 80H
BEEP Signal Output
(5) Addr:02H, Data: 00H
SPN pin
SVDD/2
Normal Output SVDD/2
(6) Addr:00H, Data:40H
(7) Addr:03H, Data:00H
Figure 69. “BEEP-Amp → Speaker-Amp” Output Sequence
<Sequence>
Clock input is not necessary when the AK4951A is operating only on the path of “BEEP-Amp” →
“SPK-Amp”.
(1) Enter Speaker-Amp Output Mode: LOSEL bit = “0”
(2) Power up VCOM, MIN-Amp and Speaker: PMVCM = PMBP = PMSL bits = “0” → “1”
(3) Set up the path of BEEP  SPK-Amp: BEEPS bit = “0” → “1”
(4) Exit the power save mode of Speaker-Amp: SLPSN bit = “0” → “1”
Period (3) should be set according to the time constant of a capacitor and a resistor that are
connected to the BEEP pin. Pop noise may occur if the SPK-Amp output is enabled before the
BEEP-Amp input is stabilized. The BEEP Amp is powered up after VCOM voltage rise. The
maximum rise-up time of VCOM is 2msec.
(5) Enter Speaker-Amp Power-save mode: SLPSN bit = “1” → “0”
(6) Power Down BEEP-Amp and Speaker: PMBP = PMSL bits = “1” → “0”
(7) Disable the path of BEEP  SPK-Amp: BEEPS bit = “1” → “0”
016001936-E-00
- 100 -
2016/03