IS31AP2031 CLASS-K AUDIO POWER AMPLIFIER
EVALUATION BOARD GUIDE
Integrated Silicon Solution, Inc. – www.issi.com
2
Rev. C, 01/22/2017
PERFORMANCE DESCRIPTION
The IS31AP2031 evaluation board has four buttons to
switch between the different modes. The operating
mode is indicated by an LED illuminated above the
appropriate buttons. The modes listed as below:
1) Mode1: gain level 12dB AGC OFF.
2) Mode2: gain level 16dB AGC ON.
3) Mode3: gain level 24dB AGC OFF.
4) Mode4: gain level 27.5dB: AGC ON.
5) Shutdown mode: close Jumper (JP2) enter
shutdown mode.
Note: IS31AP2031 Audio Amplifier provides solely the Audio
function on the evaluation board.
SOFTWARE SUPPORT
Please refer to the integrated program.
Note: The Jumper JP3 is closed by default, if the JP3 is open,
the MCU will stop functioning, the SDB pin of the chip in a high
impedance state. The external MCU can be used to control the
board SD (TP7) point.
Please refer to the datasheet to get more information about
IS31AP2031.
P0.0
1
P1.7
2
P1.6
3
RST
4
GND
5
OSC1
6
OSC2
7
INT1/P1.4
8
INT0/P1.3
9
T0/P1.2
10
RXD/P1.1
11
TXD/P1.0
12
T1/P0.7
13
P0.1
20
P0.2
19
P0.3
18
P0.4
17
P0.5
16
VDD
15
P0.6
14
U3
LPC922
K4
27.5dB AGC ON
K3
24dB AGC OFF
K2
16dB AGC ON
K1
12dB AGC OFF
D2
D3
D4
D1
R8
1K
R9
1K
R7
1K
3V
1uF
C2
4.7uF
C5
10uF
C6
C3
15nF
C4
15nF
0.1uF
C7
R1
10K
R2
10K
Speaker
100K
R3
VCC
CLOSE=SE
JP1
R10
100K
R13
100K
R12
100K
R11
100K
R6
1K
VDD
4,8
SDB
1
IN-
6
IN+
7
FS
9
AVIN
12,17,18
CP
3
CN
19
OUT+
15
OUT-
13
GND
14,20
U1
IS31AP2031
VDD
1
GND
2
SD
3
BP
4
VOUT
5
U2
LDO
C8
1uF
C10
1uF
C9
10nF
VCC
3V
VCC
SDB
SDB
LED1
LED2
LED3
LED4
LED1
LED2
LED3
LED4
R4
NC
R5
100K
SD
TP7
CLOSE=SD
JP2
VCC
3V
OPEN=EXT CTRL
JP3
TP3
TP4
IN-
IN+
OUT+
TP5
OUT-
TP6
CON3
SPK
VCC
C1
10uF
CON1
DC IN
TP1
TP2
CON2
AUDIO IN
1
2
3
4
5
TP8
ICP
3V
P0.5
P0.4
RST
GND
RST
P0.5
P0.4
Figure 2: IS31AP2031 Application Schematic
