Texas Instruments eZAudio TPA2015D1, User Manual, Page: 19 / 24

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Appendix A Technical Specifications
A.1 Control Signals from MSP430 to TPA2015D1
• Nine signals are used to control functions of the TPA2015D1. These signals come from the onboard
MSP430.
• Gain0, Gain1 (Control TPA2015D1 gain)
• AGC0, AGC1 (Control TPA2015D1 inflection point)
• ENB (TPA2015D1 Enable for the boost)
•
END (TPA2015D1 Enable for the Class-D)
• REG_EN (Enable for VDD regulator)
• I2C_SCL, I2C_SDA( for Digital POT, VDD control)
Gain0, Gain1
TPA2015D1
Gain0 Gain1 Gain
Gain Pin
L L Float 15.5 dB
H L Vdd/2 15.5 dB
L H Vdd 20 dB
H H GND 6 dB
L = 0 V and H = 3.3 V
Gain0 and Gain1 change the gain settings for the TPA2015D1. They control the 3:1 analog switch to set
proper gain voltage.
AGC0, AGC1
TPA2015D1
AGC0 AGC1 Inflection Point RAGC
(V)
L L Disabled Open
L H 3.35 V
H L 3.78 V
H H 3.96 V
L = 0 V and H = 3.3 V
AGC0 and AGC1 change the inflection point for the TPA2015D1. They control the 3:1 analog switch to set
the external AGC resistor.
19 SLOU312 – June 2011 Technical Specifications
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