TDF8541JSSLASHN2 datasheet(19/54 Pages) NXP

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TDF8541

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Product data sheet

Rev. 3 — 13 December 2011

19 of 54

NXP Semiconductors

TDF8541

I2C-bus controlled 4

 45 W power amplifier

If IB1[D2] = 1 the AC-load detection measurement cycle is enabled, the peak counter is

reset and the measuring cycle starts. The AC-load detection is only performed after the

amplifier has completed its start-up cycle. Since the AC-load information in the I2C-bus

bits is combined with the start-up diagnostics, the AC-load information can be read when

IB4[D4] = 1. If IB4[D4] = 0, the stored AC-load bits cannot be read, but their values are

preserved.

Table 6.

AC load detection

IB4[D4] = 1

DB1 to 4 [D4] (AC load bit)

No AC load detected

AC load detected

Fig 14. AC load impedance as a function of peak output voltage (high current AC-load

detection)

Fig 15. AC load impedance as a function of peak output voltage (low current AC-load

detection)

001aam701

VoM (V)

(

Ω)

trip level

load detected,

l2C-bus bits set

no load detected,

l2C-bus bits not set

001aam702

VoM (V)

(W)

load detected,

l2C-bus bits set

no load detected,

l2C-bus bits not set

trip level

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