TDF8544
NXP Semiconductors
I2C-bus controlled 4 50 W power amplifier
20. Contents
1
2
3
4
5
General description. . . . . . . . . . . . . . . . . . . . . . 1
14.1
15
Quality information. . . . . . . . . . . . . . . . . . . . . 47
Package outline. . . . . . . . . . . . . . . . . . . . . . . . 48
Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 51
Revision history . . . . . . . . . . . . . . . . . . . . . . . 51
Features and benefits . . . . . . . . . . . . . . . . . . . . 1
Quick reference data . . . . . . . . . . . . . . . . . . . . . 2
Ordering information. . . . . . . . . . . . . . . . . . . . . 2
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 3
16
17
18
Legal information . . . . . . . . . . . . . . . . . . . . . . 52
Data sheet status . . . . . . . . . . . . . . . . . . . . . . 52
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 53
18.1
18.2
18.3
18.4
6
6.1
6.2
Pinning information. . . . . . . . . . . . . . . . . . . . . . 4
Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6
7
7.1
7.2
7.3
Functional description . . . . . . . . . . . . . . . . . . . 7
Start-up and shut-down sequence . . . . . . . . . . 7
Engine start and low voltage operation. . . . . . . 9
Power-on reset and supply voltage spikes . . . 10
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Output protection and short-circuit protection. 10
Loss-of-ground/loss of VP. . . . . . . . . . . . . . . . 11
Speaker fault detection. . . . . . . . . . . . . . . . . . 12
Overvoltage warning and load dump
19
20
Contact information . . . . . . . . . . . . . . . . . . . . 53
Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.4
7.4.1
7.4.2
7.4.3
7.4.4
protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Thermal pre-warning and thermal protection . 13
Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Start-up diagnostics with DC load detection . . 14
DC offset detection . . . . . . . . . . . . . . . . . . . . . 17
AC load detection . . . . . . . . . . . . . . . . . . . . . . 18
Distortion clip detection . . . . . . . . . . . . . . . . . 20
Line driver mode and low gain mode . . . . . . . 20
I2C-bus, legacy mode and address select pin 21
Address select (pin ADSEL) . . . . . . . . . . . . . . 21
Legacy mode (RADSEL < 470 W). . . . . . . . . . . 21
I2C-bus mode . . . . . . . . . . . . . . . . . . . . . . . . . 21
I2C-bus diagnostic bits read-out/cleared after
read . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Amplifier in combination with a DC-to-DC
7.4.5
7.5
7.5.1
7.5.2
7.5.3
7.5.4
7.6
7.7
7.7.1
7.7.2
7.7.3
7.7.4
7.8
converter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8
8.1
8.2
I2C-bus specification . . . . . . . . . . . . . . . . . . . . 22
I2C-bus instruction bytes. . . . . . . . . . . . . . . . . 23
I2C-bus data bytes . . . . . . . . . . . . . . . . . . . . . 27
9
Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . 31
Thermal characteristics . . . . . . . . . . . . . . . . . 32
Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 32
Performance diagrams . . . . . . . . . . . . . . . . . . 39
10
11
12
13
Application information. . . . . . . . . . . . . . . . . . 44
Application PCB layout. . . . . . . . . . . . . . . . . . 45
Beep input . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Clip detection on pin STB. . . . . . . . . . . . . . . . 47
13.1
13.2
13.3
14
Test information. . . . . . . . . . . . . . . . . . . . . . . . 47
Please be aware that important notices concerning this document and the product(s)
described herein, have been included in section ‘Legal information’.
© NXP B.V. 2011.
All rights reserved.
For more information, please visit: http://www.nxp.com
For sales office addresses, please send an email to: salesaddresses@nxp.com
Date of release: 29 August 2011
Document identifier: TDF8544
NXP [ NXP ]
