Maxim MAX9777 Manual page 17

Stereo 3W Audio Power Amplifiers with
Table 5. MAX9777 Control Register Format
REGISTER ADDRESS
BIT NAME VALUE
7 X Don't Care
6 X Don't Care
5 X Don't Care
4 SPKR/HP
3 GAINA/B
2 HPS_D
1 IN1/IN2
0 X Don't Care
*Default
Table 6. MAX9777 Status Register Format
REGISTER ADDRESS
BIT NAME
7 THRM
6 AMPR-
5 AMPR+
4 AMPL-
3 AMPL+
2 HPSTS
1 X
0 X
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Headphone Drive and Input Mux
0000 0011
DESCRIPTION
—
—
—
0* Speaker mode selected
Headphone mode
1
selected
0* Gain-setting A selected
1 Gain-setting B selected
Automatic headphone
0*
detection enabled
Automatic headphone
1 detection disabled
(HPS ignored)
0* Input 1 selected
1 Input 2 selected
—
VALUE
0
1
0
1
0
1
0
1
0
1
0
1
Don't Care
Don't Care
In read mode (R/W = 1), the MAX9777 writes the con-
tents of the selected register to the bus. The direction of
the data flow reverses following the address acknowl-
edge by the MAX9777. The master device reads the
contents of all registers, including the read-only status
register. Table 6 shows the status register format.
The MAX9777 includes an interrupt output (INT) that
can indicate to a master device that an event has
occurred. INT is triggered when the state of HPS
changes. During normal operation, INT idles high. If a
headphone is inserted/removed from the jack and that
action is detected by HPS, INT pulls the line low. INT
remains low until a read data operation is executed.
The MAX9777 is compatible with existing I
SCL and SDA are high-impedance inputs; SDA has an
open drain that pulls the data line low during the ninth
clock pulse. The communication protocol supports the
2
standard I C 8-bit communications. The general call
address is ignored. The MAX9777 slave addresses are
compatible with the 7-bit I
0000 0000
DESCRIPTION
Device temperature below thermal limit
Device temperature exceeding thermal limit
OUTR- current below current limit
OUTR- current exceeding current limit
OUTR+ current below current limit
OUTR+ current exceeding current limit
OUTL- current below current limit
OUTL- current exceeding current limit
OUTL+ current below current limit
OUTL+ current exceeding current limit
Device in speaker mode
Device in headphone mode
Read Data Format
Interrupt Output (INT)
2
I C Compatibility
2
C systems.
2
C addressing protocol only.
—
—
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