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TDA1566J

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

For instance at an output voltage of 4 V peak the total impedance must be less than 10 Ω

to detect the AC coupled load or more than 13.4 Ω to guarantee no connected AC load is

detected. Values between 10 Ω and 13.4 Ω cannot be recognized. The result of the AC

load detection is shown in DB1[D7] for channel 1 and DB2[D7] for channel 2.

When IB1[D2] = 1 the AC load detection is enabled. The AC load detection can only be

performed after the amplifier has completed its start-up cycle and will not conflict with the

DC load detection. The default setting of IB1[D2] = 0 disables AC load detection.

Note: in the 1 Ω mode Iref is doubled, so Iref = 2 × 390 / RPROG [A].

6.3 Diagnostic

6.3.1 Diagnostic table

The available diagnostic information is shown in Table 13 and Table 14. Refer to Table 17

and Table 18 for the bitmap of the instruction and data bytes.

DIAG and CLIP have an open-drain output, are active LOW and must have an external

pull-up resistor to an external voltage.

DIAG shows fixed information and via the I2C-bus selectable information. This information

will be seen on DIAG and CLIP as a logical OR. The temperature pre-warning diagnostic

and clip information is available on the CLIP.

In case of a failure, DIAG will remain LOW and the microprocessor can read out the failure

information via the I2C-bus. The I2C-bus bits are set on a failure and will be reset with the

I2C-bus read command. Even when the failure is removed the microprocessor will know

what was wrong by reading the I2C-bus. The consequence of this procedure is that during

the I2C-bus read old information is read. Most actual information will be gathered with 2

read commands after each other.

DIAG will give actual diagnostic information (when selected). When a failure is removed,

DIAG will be released instantly, independently of the I2C-bus latches.

Table 13. Available diagnostic data TH version

Diagnostic

I2C-bus mode

DIAG

CLIP

POR

yes

no

Low VP or load yes

no

dump detection

Clip detection

selectable

yes

Temperature

selectable

yes

pre-warning

Short

selectable

no

Speaker

selectable

no

protection

Offset detection selectable

no

Maximum

yes

no

temperature

protection

Load detection no

no

Non-I2C-bus mode

DIAG

CLIP

no

no

yes

no

no

yes

no

yes

yes

no

yes

no

yes

no

yes

no

no

no

TDA1566_2

Product data sheet

Rev. 02 — 20 August 2007

© NXP B.V. 2007. All rights reserved.

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