max97236 Maxim Integrated Products, Inc., max97236 Datasheet - Page 14

• Manufacturer Part Number: max97236
• Description: Audio Amplifier With Jack Detection
• Manufacturer: Maxim Integrated Products, Inc.

Case 9 is a special case that requires subsequent test-
ing of the load pins while servicing the left audio load
that has been found. In this case only, the status bits
report that a line level audio load had been found on TIP
while tests continue to run on RING1 and SLEEVE. Once
a load is found with one of the subsequent tests, enough
information about the cable class is known to stop test-
ing. The status bits reflect what is found, and the signal
paths are configured according to the cable class and
testing stops.
There are two main jack removal detection methods: an
electrical method and a mechanical method. The electrical
Audio Amplifier with Jack Detection
Table 2. Jack Configurations and Status Registers (After DDONE Bit Has Been Reset)
14
CASE
NO.
10
11
12
13
14
1
2
3
4
5
6
7
8
9
Nothing
Extension cable
Stereo headset (headphones
with microphone), GND on P3
Stereo headset (headphones
with microphone), GND on P4
Line audio cable
Mono headset, GND on P3
Mono headset, GND on P4
Mono headset, GND on P3
Mono headset, GND on P4
Mono headset, GND on P3
Mono headset, GND on P4
Stereo headphones
Stereo headphones, right
channel open
Stereo headphones, left
channel open
CABLE CLASS
Detecting Jack Removal
C
1
F
L
L
L
L
L
L
L
L
L
L
L
F
G
G
C
R
R
R
2
F
L
L
F
F
L
F
L
PINS
G
M
G
G
M
G
M
G
M
G
G
C
G
3
F
M
G
G
M
G
M
G
M
G
G
C
G
G
4
F
unplug detection method varies, depending on which
load is plugged in. Cases with a microphone wait for the
microphone bias to fly up to its full value. The audio only
headphones wait for SLEEVE to fly up when the jack is
removed.
For cases with an AV cable and audio only connected,
the IC can only rely on JACKSW to sense removal or to
wait for user input to shut down audio.
The electrical unplug detection (JKIN bit) is not available
when the IC is running the jack configuration algorithm,
when in FORCE mode, or when in test mode. In those
cases, an unplug can only be detected mechanically
through the JACKSW bit.
JACKSW
STATE
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Open
Short
REGISTER
0x8C
0x8C
0x8C
0x00
0x8C
0x8C
0x8C
0x8C
0x8C
0x00
0x84
0x84
0x84
0x84
0x84
REGISTER
0xC0
0x01
0x00
0x00
0x30
0x30
0x20
0x20
0x30
0x20
0x10
0x20
0x20
0x20
0x20
REGISTER
0x02
0x00
0x00
0x01
0x02
0x03
0x01
0x02
0x01
0x02
0x01
0x02
0x03
0x03
0x03