TDF8599BTH datasheet(6/54 Pages) NXP

6 / 54 page

TDF8599B_1

Product data sheet

Rev. 01 — 29 July 2009

6 of 54

NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel class-D power ampliﬁer

The TDF8599B includes integrated common circuits for all channels such as the oscillator,

all reference sources, mode functionality and a digital timing manager. In addition, the

built-in protection includes thermal foldback, temperature, overcurrent and overvoltage

(load dump).

The TDF8599B operates in either I2C-bus mode or non-I2C-bus mode. In I2C-bus mode,

DC load detection, frequency hopping and extended conﬁguration functions are provided

together with enhanced diagnostic information.

8.2 Mode selection

The mode pins EN, ADS and SEL_MUTE enable mute state, I2C-bus mode and Operating

mode switching.

Pin SEL_MUTE is used to mute and unmute the device and must be connected to an

external capacitor (CON). This capacitor generates a time constant which is used to

ensure smooth fade-in and fade-out of the input signal.

The TDF8599B is enabled when pin EN is HIGH. When pin EN is LOW, the TDF8599B is

off and the supply current is at its lowest value (typically 2

µA). When off, the TDF8599B is

completely deactivated and will not react to I2C-bus commands.

I2C-bus mode is selected by connecting a resistor between pins ADS and AGND. In

I2C-bus mode with pin EN HIGH, the TDF8599B waits for further commands (see

Table 4). I2C-bus mode is described in Section 9 on page 23.

Non-I2C-bus mode is selected by connecting pin ADS to pin AGND. In non-I2C-bus mode,

the default TDF8599B state is Mute mode. The ampliﬁers switch idle (50 % duty cycle)

and the audio signal is suppressed at the output. In addition, the capacitor (CSVRR) is

charged to half the supply voltage. To enter Operating mode, pin SEL_MUTE must be

HIGH with S1 open, enabling capacitor (CON) charged by an internal pull-up (see

Figure 3). In addition, pin EN must be driven HIGH.

I2C-bus mode and non-I2C-bus mode control are described in Table 4 on page 7 and

Table 5 on page 7. Switches S1 and S2 are shown in Figure 3.

a. Non-I2C-bus mode

b. I2C-bus mode

See Table 13 for detailed information on

RADS.

Fig 3.

Mode selection

001aak216

SEL_MUTE

ADS

AGND

3.3 V

CON

TDF8599B

001aak217

SEL_MUTE

3.3 V

CON

TDF8599B

ADS

RADS

AGND

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