TDF8541THSLASHN2 datasheet(30/54 Pages) NXP

30 / 54 page

TDF8541

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Product data sheet

Rev. 3 — 13 December 2011

30 of 54

NXP Semiconductors

TDF8541

I2C-bus controlled 4

 45 W power amplifier

Remark: Data bits are only reset (cleared after read) after reading all 5 data bytes.

D5 and D4

channel 3 DC-load or AC-load detection

if bit IB4[D4] = 1, AC-load detection is enabled, bit D5 does not care, bit D4 has

the following meaning:

0 = no AC-load

1 = AC-load detected

if bit IB4[D4] = 0, AC-load detection is disabled, bits D5 and D4 are available for

DC-load detection:

00 = normal load

01 = line driver load

10 = open load

11 = not valid

channel 3 shorted load

0 = no shorted load

1 = shorted load

channel 3 output offset

0 = no output offset

1 = output offset

channel 3 short to VP

0 = no short to VP

1 = short to VP

channel 3 short to ground

0 = no short to ground

1 = short to ground

Table 17.

Data byte DB5

Bit

Description

power supply undervoltage

0 = no undervoltage

1 = undervoltage occurred

power supply overvoltage

0 = no overvoltage

1 = overvoltage has occurred

system status with start-up diagnostics or amplifier start-up [1]

0 = system not busy

1 = system busy

VP below/above 7.5 V

0=VP above 7.5 V

1=VP has dropped below 7.5 V

Table 16.

Data byte DB4 …continued

Bit

Description

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