
TDF8553J_1
NXP B.V. 2008. All rights reserved.
Objective data sheet
Rev. 01 — 3 December 2008
19 of 47
NXP Semiconductors
TDF8553J
4
× 50 Watt power amplier and multiple voltage regulator
0
D0
disable channel 4
0 = enable channel 4
1 = disable channel 4
Table 10.
Instruction byte DB1 bit description
Bit
Symbol
Description
7
D7
amplier thermal protection pre-warning
0 = no warning
1 = junction temperature above pre-warning level
6
D6
amplier maximum thermal protection
0 = junction temperature below 175
°C
1 = junction temperature above 175
°C
5
D5
channel 4 DC load detection
0 = DC load detected
1 = no DC load detected
4
D4
channel 4 AC load detection
0 = no AC load detected
1 = AC load detected
3
D3
channel 4 load short-circuit
0 = normal load
1 = short-circuit load
2
D2
channel 4 output offset
0 = no output offset
1 = output offset
1
D1
channel 4 VP short-circuit
0 = no short-circuit to VP
1 = short-circuit to VP
0
D0
channel 4 short-circuit to ground
0 = no short-circuit to ground
1 = short-circuit to ground
Table 11.
Data byte DB2 bit description
Bit
Symbol
Description
7
D7
Power-on reset occurred or amplier status
0 = amplier on
1 = POR has occurred; amplier off
6
D6
regulator thermal protection pre-warning
0 = no warning
1 = regulator temperature too high; amplier off
Table 9.
Instruction byte IB3 bit description …continued
Bit
Symbol
Description