ak4650 AKM Semiconductor, Inc., ak4650 Datasheet - Page 41

• Manufacturer Part Number: ak4650
• Description: 16bit 6 Codec With Mic/hp/spk-amp & Tsc
• Manufacturer: AKM Semiconductor, Inc.

L
Headphone jack detection sequence example:
Headphone jack detection result is reported to DTHPJ bit (Table 34). If HPINT bit is “1”, INTN pin becomes “L” when
headphone jack is detected.
When ATSW bit is “1” at PMHPL=PMHPR=PMSPK= “1” and HPMT=SPPS= “0”, Headphone-amp and Speaker-amp
are automatically powered-up/down according to headphone jack detection result (Table 35, Table 36).
MS0502-E-01
Headphone Jack Detection
(1) HPDT bit = “1”.
(2) HDT pin is pulled-up to HVDD by 100k .
(3) DTHPJ bit indicates whether headphone jack is inserted or not.
DTHPJ bit
Input Level of HDT
DTHPJ
DTHPJ
< 0.3 x HVDD
> 0.7 x HVDD
Table 35. Headphone-amp automatic power-down (ATSW bit = “1”)
0
1
0
1
AK4650
HPDT bit
Table 36. Speaker-amp automatic power-save (ATSW bit = “1”)
100k
HVDD
Table 34. Headphone Jack Detection Result
HDT pin
HPL pin
HPR pin
Figure 28. Headphone Jack Detection
PMHPL
PMHPR
PMSPK
Headphone Jack
6.8
6.8
Not inserted
x
0
1
0
1
0
1
Inserted
DTHPJ bit
47u
47u
0
1
- 41 -
2.2k
2.2k
Pins 1 and 2
Open
Short
HPMT
SPPS
X
X
X
x
1
0
1
0
Headphone Jack
Not inserted
Headphone Out
Inserted
1
2
3
4
5
“L” (pulled-down by external 2.2k)
“H” (pulled-up by internal 100k)
Power Down
Power Save
Power Down
Power Down
Power Down
Power Save
Power UP
SPK-Amp
Power UP
HP-Amp
HDT pin
[AK4650]
2007/04