ak4642e AKM Semiconductor, Inc., ak4642e Datasheet - Page 51

• Manufacturer Part Number: ak4642e
• Description: Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
<Speaker-Amp Control Sequence>
Speaker-Amp is powered-up/down by PMSPK bit. When PMSPK bit is “0”, both SPP and SPN pin are in Hi-Z state.
When PMSPK bit is “1” and SPPSN bit is “0”, the Speaker-Amp enters power-save mode. In this mode, SPP pin is placed
in Hi-Z state and SPN pin goes to HVDD/2 voltage. Power-save mode can reduce the pop noise at power-up and
power-down.
MS0420-E-00
PMSPK
PMSPK bit
SPPSN bit
0
1
SPN pin
SPP pin
SPPSN
Hi-Z
x
0
1
Figure 34. Power-up/Power-down Timing for Speaker-Amp
Table 44. Speaker-Amp Mode Setting (x: Don’t care)
HVDD/2
Hi-Z
Normal Operation
Power-down
Power-save
Mode
- 51 -
Normal Operation
Hi-Z
Hi-Z
SPP
Normal Operation
HVDD/2
Hi-Z
SPN
HVDD/2
Hi-Z
Hi-Z
Default
[AK4642EN]
2005/09