TPA6166A2_15 Datasheet, PDF (16/49 Pages) Texas Instruments – TPA6166A2 3.5-mm Jack Detect and Headset Interface IC

TPA6166A2
SLAS997B – MARCH 2014 – REVISED JANUARY 2015
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Feature Description (continued)
7.3.2 Accessory Detection
The TPA6166A2 has an advanced accessory jack detection circuitry which determines insertion, removal, as well
as type detection of accessories with a 3.5-mm headset jack. The jack and its internal connections are shown in
Figure 27.
2 (RING1)
1 (TIP)
5 (JACK_SENSE,
Normally Closed)
3 (RING2)
4 (SLEEVE)
1 23 4
Figure 27. Connecting to a 3.5-mm Headset Jack
When the insertion of a jack is detected, the accessory type detection algorithm runs until two consecutive type
detections produce the same result. In general, the type detection algorithm is not run again after this point of
time. Hence, on-the-fly change of accessory type is not detected. The following accessories can be detected.
Table 6 has specific detection details.
• Stereo Headset (HP with mic)
• Line Out Audio Cable
• Mono Headset
• Stereo Headphone
• Line Out Audio Cable
The limits of detection are shown in Table 1.
PARAMETER
Cable Shield Capacitance
Headphone Load Resistance
Audio Line Load Resistance
Microphone Load Resistance
Open/Float
SYMBOL
CCABLE
RHP
RLINE
RMIC
Table 1. Limits of Detection
MIN
150
8
10
1.5
200K || 70 pF
MAX
500
700/1500*
50
20
10 G || 5 pF
UNIT
pF
Ω
kΩ
kΩ
kΩ
As a result of accessory detection, appropriate blocks are automatically turned on ensuring lower possible power
consumption. When accessory is removed, all blocks are turned off ensuring ultra low power. The TPA6166A2
achieves 22.7 µW when no accessory is inserted.
16
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