TDF8541THSLASHN2 datasheet(27/54 Pages) NXP

27 / 54 page

TDF8541

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Product data sheet

Rev. 3 — 13 December 2011

27 of 54

NXP Semiconductors

TDF8541

I2C-bus controlled 4

 45 W power amplifier

8.2 I2C-bus data bytes

I2C-bus mode:

• If R/W = 1, the TDF8541 sends data bytes to the microprocessor

• All bits are reset after a read operation except DBx[D4] and DBx[D5] in DB1 to DB4.

Bit DBx[D2] in DB1 to DB4 is set after a read operation; see Section 7.5.1 and

Section 7.5.2.

• For explanation of AC and DC load detection bits, see Section 7.5.3

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

Table 13.

Data byte DB1

Bit

Description

temperature pre-warning

0 = no temperature pre-warning

1 = temperature pre-warning has occurred

speaker fault channel 2

0 = no speaker fault, channel 2

1 = speaker fault, channel 2

D5 and D4

channel 2 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 2 shorted load

0 = no shorted load

1 = shorted load

channel 2 output offset

0 = no output offset

1 = output offset

channel 2 short to VP

0 = no short to VP

1 = short to VP

channel 2 short to ground

0 = no short to ground

1 = short to ground

TDF8541TH/N2 数据表(PDF) 27 Page - NXP Semiconductors

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