TDF8544
NXP Semiconductors
I2C-bus controlled 4 50 W power amplifier
Table 16. Data byte DB4 …continued
Bit
Description
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
D3
D2
D1
D0
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
Remark: Data bits are only reset (cleared after read) after reading all 5 data bytes.
Table 17. Data byte DB5
Bit
Description
D7
power supply undervoltage
0 = no undervoltage
1 = undervoltage occurred
power supply overvoltage
0 = no overvoltage
D6
D5
D4
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
TDF8544
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© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 29 August 2011
30 of 54
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