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TDA1566

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

6.1.5 Mute speed setting

In I2C-bus mode the amplifier can be muted slow (20 ms) or fast (0.1 ms). The mute speed

is selected with IB2[D2].

See Section 6.4.2 for the definition of the instruction bytes. Table 10 lists the operation

mode transitions where slow and fast mute are applied. The operation modes are

described in Section 6.1.1, Table 5.

Table 10. Mute speed setting

Mode transition

I2C-bus mode

Mute to operating

slow mute

Operating to mute

IB2[D2] = 0: slow mute

IB2[D2] = 1: fast mute

Operating to standby

slow mute

Operating to off

fast mute

Non-I2C-bus mode

slow mute

slow mute

n.a.

fast mute

6.1.6 Pins with double functions

Table 11.

Pin

PROG

ADS1

ADS2[1]

EN

Pins with double functions

I2C-bus mode

load detection reference

current programming, see

Section 6.2.1 and 6.2.2

I2C-bus address select bit 1,

see Section 6.4.1

I2C-bus address select bit 2,

see Section 6.4.1

chip enable, see Section 6.1.1

Non-I2C-bus mode

gain select, see Section 6.1.2

non-I2C-bus mode select, see

Section 6.1.1

balanced/unbalanced input,

see Section 3

mode select, see Section 6.1.1

[1] TH version only.

6.2 Load identification (I2C-bus mode only)

6.2.1 DC load detection

The default setting IB1[D1] = 0 disables DC load detection. When the DC load detection is

enabled with IB1[D1] = 1, an offset is slowly applied at the output of the amplifiers at the

beginning of the start-up cycle. The DC load is measured and compared with Rtrip1 and

Rtrip2 to distinguish between an amplifier load, line driver load or open load. Rtrip1 and

Rtrip2 are set with resistor RPROG (1 %) connected between the PROG pin and GND.

TDA1566_2

Product data sheet

amplifier load

line driver load

open load

0Ω

25 Ω

100 Ω

500 Ω

5 kΩ

∞

Rtrip1

Rtrip2

001aad 010

Fig 7. DC load detection limits (RPROG = 1500 Ω/1 %)

The relation between RPROG, Rtrip1 and Rtrip2 is approximated by (valid for RPROG should

be between 1.2 kΩ and 4 kΩ):

Rev. 02 — 20 August 2007

© NXP B.V. 2007. All rights reserved.

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