TDF8544
NXP Semiconductors
I2C-bus controlled 4 50 W power amplifier
Table 14. Data byte DB2
Bit
Description
D7
POR and amplifier status
0 = POR disabled; amplifier enabled
1 = POR has occurred; amplifier disabled
speaker fault channel 4
D6
0 = no speaker fault
1 = speaker fault, channel 4
D5 and D4
channel 4 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
D3
D2
D1
D0
channel 4 shorted load
0 = no shorted load
1 = shorted load
channel 4 output offset
0 = no output offset
1 = output offset
channel 4 short to VP
0 = no short to VP
1 = short to VP
channel 4 short to ground
0 = no short to ground
1 = short to ground
Remark: Data bits are only reset (cleared after read) after reading 5 data bytes.
Table 15. Data byte DB3
Bit
Description
D7
maximum temperature protection
0 = no protection
1 = maximum temperature protection
speaker fault channel 1
D6
0 = no speaker fault, channel 1
1 = speaker fault, channel 1
TDF8544
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 29 August 2011
28 of 54
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