Shutdown Mode - ISSI IS31AP2031-QFLS2-EB Manual

IS31AP2031 CLASS-K AUDIO POWER AMPLIFIER
EVALUATION BOARD GUIDE
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.
U2
VCC
1
VDD VOUT
3
SD
C8
1uF 2
GND
LDO
TP1
CON1
VCC
DC IN
C1
10uF
TP2
27.5dB AGC ON K4
24dB AGC OFF K3
16dB AGC ON K2
12dB AGC OFF K1
Integrated Silicon Solution, Inc. – www.issi.com
Rev. C, 01/22/2017
3V
5
C9 C10
10nF 1uF C2
4 1uF
BP
TP3
CON2
AUDIO IN IN-
IN+
TP4
LED1
LED2
VCC RST
R10 R11 R12 R13
100K 100K 100K 100K
Figure 2: IS31AP2031 Application Schematic
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.
U1
VCC
4,8
VDD
JP2
CLOSE=SD
SDB 1
SDB
SD
TP7
C3 R1
15nF 10K 6
IN-
C4 R2
15nF 10K 7
IN+
9
FS
JP1
CLOSE=SE
R3 IS31AP2031
100K
U3 3V
1 15
P0.0 VDD
2
P1.7
4 20 LED4
RST P0.1
19 LED3
P0.2
18
P0.3
3
P1.6
17 P0.4
P0.4
8
INT1/P1.4
16 P0.5
P0.5
9
INT0/P1.3
14 SDB
P0.6
10
T0/P1.2
6 13
OSC1 T1/P0.7
7 12
OSC2 TXD/P1.0
5 11
GND RXD/P1.1
LPC922
12,17,18
AVIN
C7 C6
0.1uF 10uF
3
CP
C5
19 4.7uF
CN
TP5
15 OUT+
OUT+
13 OUT-
OUT-
14,20
TP6
GND
R6
LED4 1K
R7
LED3 1K
JP3 R8
OPEN=EXT CTRL LED2 1K
R9
LED1 1K
R4 VCC
NC TP8
3V
5
R5 P0.5
4
100K P0.4
3
RST
2
GND
1
ICP
CON3
SPK
Speaker
3V
D4
D3
D2
D1
2