AK4637EN Datasheet, PDF (90/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC/SPK-AMP

[AK4637]
■ Beep Signal Output from Speaker Amplifier
PMVCM bit
(Addr:00H, D6)
PMBP bit
(Addr:00H, D5)
PMSL bit
(Addr:01H, D1)
BEEPS bit
(Addr:0FH, D5)
SLPSN bit
(Addr:02H, D7)
SPP pin
SPN pin
(1)
(2)
(3)
(5)
(6)
Example: SPKGain = +6.4dB
(SPKG1-0 bits = “00”)
(1) Addr:00H, Data:60H
Addr:01H, Data:02H
(2) Addr:0FH, D5 bit = “1”
(3) Addr:02H, Data:84H
BEEP Signal Output
(4)
Hi-Z
Normal Output
Hi-Z
(4) Addr:02H, Data:04H
(5) Addr:00H, Data:40H
Hi-Z AVDD/2
Normal Output AVDD/2 Hi-Z
(6) Addr:03H, Data:00H
Figure 73. “BEEP-Amp → Speaker-Amp” Output Sequence
<Sequence>
Clock input is not necessary when the AK4637 is operating only on the path of “BEEP-Amp” →
“SPK-Amp”.
(1) Power up VCOM, MIN-Amp and Speaker: PMVCM = PMBP = PMSL bits = “0” → “1”
(2) Set up the path of BEEP  SPK-Amp: BEEPS bit = “0” → “1”
(3) 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.
(4) Enter Speaker-Amp Power-save mode: SLPSN bit = “1” → “0”
(5) Power Down BEEP-Amp and Speaker: PMBP = PMSL bits = “1” → “0”
(6) Disable the path of BEEP  SPK-Amp: BEEPS bit = “1” → “0”
015010680-E-00
- 90 -
2015/09