TDF8599B datasheet(18/54 Pages) NXP

18 / 54 page

TDF8599B_1

Product data sheet

Rev. 01 — 29 July 2009

18 of 54

NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel class-D power ampliﬁer

Pin DIAG goes LOW when a short circuit to one of the ampliﬁer outputs occurs. The

microprocessor reads the failure information using the I2C-bus. The I2C-bus bits are set

for a short circuit. These bits can be reset with the I2C-bus read command.

Even after the short has been removed, the microprocessor knows what was wrong after

reading the I2C-bus. Old information is read when a single I2C-bus read command is

used. To read the current information, two read commands must be sent, one after

another.

When selected, pin DIAG gives the current diagnostic information. Pin DIAG is released

instantly when the failure is removed, independent of the I2C-bus latches.

When OCP is triggered, the open-drain DIAG output is activated. The diagnostic output

signal during different short circuit conditions is illustrated in Figure 15.

8.6.2 Load identiﬁcation (I2C-bus mode only)

8.6.2.1

DC load detection

DC load detection is only available in I2C-bus mode and is controlled using bit IB2[D2].

The default setting is logic 0 for bit IB2[D2] which disables DC load detection. DC load

detection is enabled when bit IB2[D2] = 1. Load detection takes place before the class-D

ampliﬁer output stage starts switching in Mute mode and the start-up time from Standby

mode to Mute mode is increased by tdet(DCload) (see Figure 16).

Table 11.

Available data on pins DIAG and CLIP

Diagnostic

I2C-bus mode

Non-I2C-bus mode

Pin DIAG

Pin CLIP

Pin DIAG

Pin CLIP

Power-on reset

yes

UVP or OVP

yes

Clip detection

selectable

yes

Temperature pre-warning

selectable

yes

OCP/WP

yes

DCP

selectable

yes

OTP

yes

Fig 15. Diagnostic output for short circuit conditions

001aai786

AMPLIFIER

RESTART

shorted load

pull up V

AGND = 0 V

≈50 ms

RESTART

short to GND or VP line

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