IS31AP2111 2×20W STEREO DIGITAL (I2S) AUDIO
AMPLIFIER WITH 20 BANDS EQ FUNCTIONS
Integrated Silicon Solution, Inc. – www.issi.com 2
Rev. A, 12/19/2014
PROCEDURE
The IS31AP2111 demo board is fully assembled and
tested. Follow the steps listed below to verify board
operation.
Caution: Do not turn on the power supply until all connections
are completed.
1) Connect the ground terminal of the power supply
to the GND and the positive terminal to the VCC.
Or connect DC power to connector (DC IN).
2) Connect a pair of 8speakers to the SPK_L
(RCA connector) and SPK_R (RCA connector).
3) Connect an audio source to the audio connector
AUDIO IN (3.5mm stereo connector).
4) Turn on the power supply.
5) IS31AP2111’s default setting is mute. Please
program the following registers via the I2C
interface to disable the mute:
a) When use A/D converter(U2) I2S data output
for IS31AP2111, the evaluation board must
set the MCLK/FS to 256x and Sampling
Frequency to 32/44.1/48kHZ, write value
(04h) to register 0x01 to set the state.
b) 02h State Control 3 Register: To disable the
Master mute: clear bit D3 To disable the
individual channel mutes: clear D2:D1 bits.
c) 03h Master Volume Control Register: To set
the Master volume write a value to bits D7:D0,
To set the individual channel volumes: write a
valuetoregisters0x04-0x05.
d) Please refer to the IS31AP2111 datasheet for
register values used in programming features
such as mute, volume, bass/treble tone,
surround sound, equalization, etc.
JUMPER AND SWITCH SETTING TABLE
Jumper/Switch
Connector Options Setting
(Jumper on “H” for logic 1, on “L” for logic 0)
S1 Enable/disable IS31AP2111
L(0): shutdown mode
H(1): standby mode
S2 Hardware reset Pressed: reset
JP7 3.3V output 3.3V output, if AMS1117 is not mounted, can
provide 3.3V through this connector
JP1 ERROR status output
Short circuit is reported on Error pin (JP1-2) as a
low state, and protection is latched ,connect Error
pin (JP1-2) to PDB pin (JP1-1),short circuit
protection latch can auto-recovery
JP2 A/D Converter (U2) I2S data output
( MCLK,DATA,LRCIN,BCLK)
Use a two pin header to connect I2S signal from
JP2 to JP3
JP3 I2S data input (MCLK, DATA, LRCIN,
BCLK)
Connect I2S signal from JP3 or connect to an
external I2S data source
JP4 GND
JP5
I2C interface, program interface for
an external I2C controller used for
programming the IS31AP2111
registers.
JP5-1 I2C SCL (Clock)
JP5-2 I2C SDA (Data)
JP5-3 I2C GND
JP6 I2C address setting
L(0): Set the I2C device address to 0x30 (7bit
address 0110000)
H(1): Set the I2C device address to 0x34(7bit
address0110100)
SPK_R Right channel output RCA
connector Connect to 8ohm 20W speaker
SPK_L Left channel output RCA connector Connect to 8ohm 20W speaker
AUDIO IN 3.5mm stereo connector Analog audio input
DC IN 2.5mm DC Connector 10~26V, 4A power supply
