Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsDev KitsPCB design board

Reference

2-13

Operation

2.5.3.4 Control Register Operation

Each bit of the control register allows the user to control the operating mode

of the TPA0172, as shown in Table 2–9.

Table 2–9. TPA0172 Control Register Operation

BIT FUNCTION VALUE RESULT

SHUTDOWN

0 Normal operation

0 SHUTDOWN

1 Shutdown mode

HP/LINE

0 Line inputs selected

1 HP/LINE

1 Headphone inputs selected

2 Reserved 0 Reserved

Mute

0 Normal operation

3 Mute

1 Mute mode

4 Reserved 1 Reserved

SE/BTL

0 BTL mode

5 SE/BTL

1 SE mode

Gain register select

0 Use gain register 1

6 Gain register select

1 Use gain register 2

PCB ENABLE

0 Auto-detect PCBEEP

7 PCB ENABLE

1 PCBEEP always on

Bit 0 operates in the same manner as the external SHUTDOWN pin, only the

logic is reversed (i.e., the device is active when the internal bit is low and is in

shutdown when the internal bit is high).

Bit 1 allows the user to select the input source. If bit 1 of the mask register is

set, however, the HP/LINE

function is tied to the external SE/BTL pin.

Bit 2 This bit is reserved for future functionality. Always set this bit to 0.

Bit 3 performs the same mute function as setting either bit 6 or 7 in the gain

registers.

Bit 4 This bit is reserved for future functionality. Always set this bit to 1.

Bit 5 operates in the same manner as the external SE/BTL pin.

Bit 6 allows the user to select which gain registers will determine the gain

settings for each channel. For example, the amplifier may be configured to

operate in SE mode with the gain settings taken from either register 1 or

pin if bit 1 of the mask register

is set, which results in gain register 1 controlling the gain in SE mode and gain