TDA1566TH View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

TDA1566TH

I²C-bus controlled dual channel 46 W/2Ω, single channel 92 W/1Ωamplifier with load diagnostic features

NXP Semiconductors. 

NXP Semiconductors

TDA1566

I2C-bus controlled dual channel/single channel amplifier

6.3.4 Speaker protection

To prevent damage of the speaker when one side of the speaker is connected to ground,

see Figure 9, a ‘missing current protection’ is implemented.

IO1

IO2

Fig 9. Speaker protection condition

001aad 012

When in one BTL channel the absolute value of the current through the output terminals

differ, so |IO1| ≠ |IO2|, a fault condition is assumed, and the BTL channel will be switched off.

The ‘speaker protection active’ diagnosis options for I2C-bus and non-I2C-bus mode are

listed in Table 13.

6.3.5 Offset detection

The offset detection can be performed with no input signal (for instance when the DSP is

in mute after a start-up) or with input signal.

In I2C-bus mode the offset bits DB1[D2] and DB2[D2] are set by executing a read

command. The offset bits will be reset when the BTL output voltage

Vo = |VOUT1+ − VOUT1−| enters the offset threshold window of 1.5 V. The offset bits are read

with a 2nd read command.

In non-I2C-bus mode (or in I2C-bus mode with offset diagnostic selected on DIAG) DIAG

will be pulled LOW if the BTL output voltage is more than 1.5 V.

TDA1566_2

Product data sheet

Rev. 02 — 20 August 2007

© NXP B.V. 2007. All rights reserved.

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