AK4650 Datasheet, PDF (41/86 Pages) Asahi Kasei Microsystems – 16Bit ΔΣ CODEC with MIC/HP/SPK-AMP & TSC

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