max9777etit Maxim Integrated Products, Inc., max9777etit Datasheet - Page 17

• Manufacturer Part Number: max9777etit
• Description: Max9777, Max9778 Stereo 3w Audio Power Amplifiers With Headphone Drive And Input Mux
• Manufacturer: Maxim Integrated Products, Inc.

Table 5. MAX9777 Control Register Format
*Default
Table 6. MAX9777 Status Register Format
REGISTER ADDRESS
BIT
7
6
5
4
3
2
1
0
BIT
7
6
5
4
3
2
1
0
REGISTER ADDRESS
SPKR/HP
GAINA/B
IN1/IN2
HPS_D
NAME
X
X
X
X
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Stereo 3W Audio Power Amplifiers with
AMPR+
AMPL+
AMPR-
HPSTS
NAME
AMPL-
THRM
Don’t Care
Don’t Care
Don’t Care
Don’t Care
VALUE
X
X
0*
0*
0*
0*
1
1
1
1
Speaker mode selected
Headphone mode
selected
Gain-setting A selected
Gain-setting B selected
Automatic headphone
detection enabled
Automatic headphone
detection disabled
(HPS ignored)
Input 1 selected
Input 2 selected
0000 0011
DESCRIPTION
Headphone Drive and Input Mux
Don’t Care
Don’t Care
—
—
—
—
VALUE
0
1
0
1
0
1
0
1
0
1
0
1
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
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.
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
standard I
address is ignored. The MAX9777 slave addresses are
compatible with the 7-bit I
Table
2
0000 0000
C 8-bit communications. The general call
6 shows the status register format.
DESCRIPTION
2
—
—
C addressing protocol only.
Interrupt Output (INT)
Read Data Format
I
2
C Compatibility
2
C systems.
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