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7−5
Table 7−1. GPI Terminal Programming
GPI5 GPI4 GPI3 GPI2 GPI1 GPI0
VOL_UP, +1 dB x
VOL_DN, −1 dB x
BASS_UP, +1 dB x
BASS_DN, −1 dB x
TREB_UP, +1 dB x
TREB_DN, −1 dB x
Shift 1 x x
Mute x
EQ1 x
EQ2 x
EQ3 x
EQ4 x
EQ5 x
Shift 2 x x
NOTE: x = Logic low
Initially (after reset), the TAS3002 GPI is set to control volume, bass, and treble. Simultaneously setting GPI bits 1
and 5 low for 1 second changes the function of the GPI terminals to control mute and equalization.
To return to volume, bass, and treble control, simultaneously set GPI terminals 2 and 3 low for 1 second.
When a GPI terminal is activated, the TAS3002 device echoes its function over I
2
C to a TAS3001 device mapped
to address 6Ah. Therefore, a system with two audio equalization chips can be implemented without the need for a
microcontroller.
7.6.2 GPI Architecture
The GPI provides simple but flexible input port to activate the input parameters. Each terminal input is an active logic
low.