TAS5508−5121K8EVM
Evaluation Module for the TAS5508B 8-Channel
Digital Audio PWM Processor and the TAS5121
Digital Amplifier Power Output Stage
User’s Guide
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Copyright © 2006, Texas Instruments Incorporated
EVALUATION BOARD/KIT IMPORTANT NOTICE
Texas Instruments (TI) provides the enclosed product(s) under the following conditions:.
This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR
EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end−product fit for general
consumer use. Persons handling the product(s) must have electronics training and observe good engineering
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design−, marketing−, and/or manufacturing−related protective considerations, including product safety and
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Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be
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EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end−product fit for general
consumer use. It generates, uses, and can radiate radio frequency energy and has not been tested for
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reasonable protection against radio frequency interference. Operation of this equipment in other environments
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to take whatever measures may be required to correct this interference.
Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265
.
FCC WARNING
Copyright © 2006, Texas Instruments Incorporated
EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 0–29.5 V and the output
voltage range of 15–20 V for the system supply.
Exceeding the specified input range may cause unexpected operation and/or irreversible
damage to the EVM. If there are questions concerning the input range, please contact a TI
field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or
possible permanent damage to the EVM. Please consult the EVM User’s Guide prior to
connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than
75°C. The EVM is designed to operate properly with certain components above 75°C as long
as the input and output ranges are maintained. These components include but are not limited
to linear regulators, switching transistors, pass transistors, and current sense resistors. These
types of devices can be identified using the EVM schematic located in the EVM User’s Guide.
When placing measurement probes near these devices during operation, please be aware
that these devices may be very warm to the touch.
Mailing Address:
Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright © 2006, Texas Instruments Incorporated
About This Manual
This manual describes the operation of the TAS5508−5121K8EVM evaluation
module from Texas Instruments.
How to Use This Manual
This document contains the following chapters:
- Chapter 1 — Overview
- Chapter 2 — System Interfaces
- Chapter 3 — Protection
Preface
Read This First
Information About Cautions and Warnings
This manual may contain cautions and warnings.
This is an example of a caution statement.
A caution statement describes a situation that could potentially
damage your software or equipment.
This is an example of a warning statement.
A warning statement describes a situation that could potentially
cause harm to you
The information in a caution or a warning is provided for your protection.
Please read each caution and warning carefully.
.
Read This First
iii
Related Documentation From Texas Instruments
The following table contains a list of data manuals that have detailed
descriptions of the integrated circuits used in the design of the
TAS5508−5121K8EVM. The data manuals can be obtained at the URL
http://www.ti.com.
Part Number Literature Number
TAS5508B SLES162
TAS5121 SLES086
TLV272 SLOS351
SN74LVC1G00 SCES212
SN74LVC1G08 SCES217
SN74LVC2G08 SCES198
SN74LVC1G14 SCES218
SN74LV123A SCLS393
SN74LVC125A SCAS290
SN74LVC1G126A SCES211
LM317M SLVS297
TPS3801K33 SLVS219
TPS76733 SLVS208
Additional Documentation
TAS5508−5121K8EVM Application Report (SLEA034A)
PC Configuration Tool for TAS5508B (TAS5508 GUI ver.2.1 or later)
General Application Notes
FCC Warning
This equipment is intended for use in a laboratory test environment only. It
generates, uses, and can radiate radio frequency energy and has not been
tested for compliance with the limits of computing devices pursuant to subpart
J of part 15 of FCC rules, which are designed to provide reasonable protection
against radio frequency interference. Operation of this equipment in other
environments may cause interference with radio communications, in which
case the user at his own expense will be required to take whatever measures
may be required to correct this interference.
Trademarks
Equibit, PowerPAD, and PurePath Digital are trademarks of Texas
Instruments.
iv
Contents
1 Overview 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 TAS5508−5121K8EVM Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 PCB Key Map 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 System Interfaces 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Power Supply (PSU) Interface (J70, J71, and J73) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1.1 PSU Control Interface (J72) 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Loudspeaker Connectors (J100 . . . J800) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Line Out Connectors (J950 and J951) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Headphone Connector (J900) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Line Output Select (J50) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Headphone Select (J32) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Control Interface (J30) 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Digital Audio Interface (J40) 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Protection 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Short-Circuit Protection and Fault-Reporting Circuitry 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Device Fault Reporting 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Contents
v
Figures
1−1 Integrated PurePath Digitalt Amplifier System 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1−2 Physical Structure for the TAS5508−5121K8EVM (Rough Outline) 1-3. . . . . . . . . . . . . . . . . . .
2−1 Recommended Power-Up Sequence 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−2 J71 and J70 Pin Numbers 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−3 J73 Pin Numbers 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−4 J72 Pin Numbers 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−5 J100 . . . J800 Pin Numbers 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−6 J950 and J951 Pin Numbers 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−7 J900 Pin Numbers 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−8 J50 Pin Numbers 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−9 J32 Pin Numbers 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tables
2−1 Recommended Supply Voltages 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−2 J71 Pin Description 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−3 J70 Pin Description 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−4 J73 Pin Description 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−5 J72 Pin Description 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−6 J100 . . . J800 Pin Description 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−7 J950 and J952 Pin Description 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−8 J900 Pin Description 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−9 J50 Pin Description 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−10 J32 Pin Description 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−11 J30 Pin Description 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2−12 J40 Pin Description 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−1 Channel Allocation 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3−2 TAS5121 Warning/Error Signal Decoding 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
vi
Chapter 1
Overview
The TAS5508−5121K8EVM PurePath Digital™ customer evaluation amplifier
module demonstrates two audio integrated circuits, TAS5508B and TAS5121,
from Texas Instruments (TI).
The TAS5508BPAG is a high-performance 32-bit (24-bit input) multichannel
PurePath Digital pulse width modulator (PWM) based on Equibit™ technology,
with a new fully symmetrical AD modulation scheme. It accepts an input
sample rate from 32 kHz to 192 kHz. The device also has digital audio
processing (DAP) that provides 48-bit signal processing, advanced
performance, and a high level of system integration. The device has interfaces
for headphone output and power supply volume control (PSVC).
The TAS5121DKD is a compact, high-power, digital amplifier power stage
designed to drive a 4-Ω loudspeaker up to 100 W (10% THD+N). The
TAS5121DKD contains integrated gate drivers, four matched and electrically
isolated enhancement-mode N-channel power DMOS transistors, and
protection/fault-reporting circuitry.
The DKD package has a PowerPAD™ on the top side for heat transfer through
a heatsink. The heatsink in this design is for evaluation purpose only.
This EVM, together with a TI input board, is a complete 8-channel digital audio
amplifier system, which includes digital input (S/PDIF), analog inputs,
interface to PC, and DAP features, such as digital volume control, input and
output mixers, auto mute, equalization, tone controls, loudness, dynamic
range compression, and PSVC output. There are configuration options for
stereo line level output, stereo headphone output, and power-stage failure
protection.
This 7.1 system is designed for home-theater applications, such as A/V
receivers, DVD minicomponent systems, home theater in a box (HTIB), DVD
receivers, or plasma display panels (PDPs).
Topic Page
1.1 TAS5508−5121K8EVM Features 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 PCB Key Map 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview
1-1
TAS5508−5121K8EVM Features
1.1 TAS5508−5121K8EVM Features
- 8-channel PurePath Digital evaluation module
- Stereo channel line output
- Stereo headphone output
- Self-contained protection system (short circuit and thermal)
- Standard I
2
S and I2C control connector for TI input board
- Double-sided plated-through PCB layout
Figure 1−1. Integrated PurePath DigitalE Amplifier System
2 Channel
Headphone Output
6 Channel
Analog Input
PC Interface
Optical
and
Coaxial
S/PDIF Input
Example
Texas Instruments
Input−PC Board
Control Interface
I2C Bus
I2S Bus
TAS5508−5121K8EVM
Module
Power Supply
2 Channel
Rec Line Output
8 Channel
Speaker Output
1-2
1.2 PCB Key Map
The physical structure for the TAS5508−5121K8EVM is illustrated in
Figure 1−2.
Figure 1−2. Physical Structure for TAS5508−5121K8EVM (Rough Outline)
PCB Key Map
Left Line
Output
(J950)
Headphone
Output
(J900)
Right Line
Output
(J951)
Channel 6
Output Stage
Channel 5
Output Stage
Channel 8
Output Stage
Control
Interface (J30)
J700J800J500J600
Channel 7
Output Stage
TAS5508B
PSU
Interface
(J70)
Channel 4
Output Stage
Input Signal
Interface (J40)
Speaker OutputsSpeaker Outputs
Channel 3
Output Stage
J100J200J300J400
Channel 2
Output Stage
PSU
PSU
PSU
Channel 1
Output Stage
(J73)
Interface
(J71)
Interface
(J72)
Control
Regulator
Gate Drive
5−V
Regulator
3.3−V
Regulator
Overview
1-3
1-4
Chapter 2
This chapter describes the TAS5508−5121K8EVM board in regards to
power supplies and system interfaces.
Topic Page
2.1 Power Supply (PSU) Interface (J70, J71, and J73) 2-2. . . . . . . . . . . . . . . .
2.2 Loudspeaker Connectors (J100 . . . J800) 2-4. . . . . . . . . . . . . . . . . . . . . . .
2.3 Line Out Connectors (J950 and J951) 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Headphone Connector (J900) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Line Output Select (J50) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Headphone Select (J32) 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7 Control Interface (J30) 2-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Digital Audio Interface (J40) 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Interfaces
2-1
Power Supply (PSU) Interface (J70, J71, and J73)
2.1 Power Supply (PSU) Interface (J70, J71, and J73)
The TAS5508−5121K8EVM module must be powered from external power
supplies. High-end audio performance requires a stabilized power supply with
low ripple voltage and low output impedance.
Note:
The length of the power supply cable must be minimized. Increasing length
of PSU cable is equal to increasing the distortion for the amplifier at high
output levels and low frequencies.
The maximum output-stage supply voltage depends of the speaker load
resistance. Check the recommended maximum supply voltage in the
TAS5121 data sheet (SLES086).
Table 2−1. Recommended Supply Voltages
Description
System power supply 15 – 20 V 0.3 A
Output-stage power supply 0 – 30.5 V 6 A
†
The rated current corresponds to 2-channel full scale (80 W each), which most likely is adequate
for a standard 8-channel amplifier design.
The recommended TAS5121 power-up sequence is shown in Figure 2−1. For
proper TAS5121 operation, the RESET signal should be kept low during power
up. RESET
is pulled low during power up for 200 ms by the onboard reset
generator (U73).
Figure 2−1. Recommended Power-Up Sequence
System power supply
Output stage power supply
RESET
> 1 ms
Voltage Limitations
(4-W load)
Current
Recommendations
†
Figure 2−2. J71 and J70 Pin Numbers
System Power Supply
(PCB connector top view)
2-2
4
3
2
1
Table 2−2. J71 Pin Description
Pin No. Net-Name at Schematics Description
1 V-HBRIDGE Output-stage power supply
2 − System power supply
3 GND Ground
4
Table 2−3. J70 Pin Description
(Optional − Use to decrease of impedance to reach better performance)
Pin No. Net-Name at Schematics Description
1 V-HBRIDGE Extra output-stage power supply
2 V-HBRIDGE Extra output-stage power supply
3 GND Extra ground
4
Figure 2−3. J73 Pin Numbers
Power Supply (PSU) Interface (J70, J71, and J73)
GND Ground
GND Extra ground
2
(PCB connector top view)
Table 2−4. J73 Pin Description
(Optional)
Pin No. Net-Name at Schematics Description
1 V-HBRIDGE Extra output-stage power supply
2 V-HBRIDGE Extra output-stage power supply
2.1.1 PSU Control Interface (J72)
This interface is used for onboard sensing of output supply voltage and for the
power supply volume control (PSVC) signal.
Figure 2−4. J72 Pin Numbers
1
5
4
3
2
1
(PCB connector top view)
System Interfaces
2-3
Loudspeaker Connectors (J100 . . . J800)
Table 2−5. J72 Pin Description
Pin No. Net-Name at Schematics Description
1 — Reserved for future use
2 V-HBRIDGE Sense of output power supply
3 GND Ground
4 RESET
5
PSVC Power-supply volume control signal
2.2 Loudspeaker Connectors (J100 . . . J800)
Both positive and negative speaker outputs are floating and may
not be connected to ground (e.g., through an oscilloscope).
Figure 2−5. J100 . . . J800 Pin Numbers
System reset (bidirectional)
2
1
(PCB connector top view)
Table 2−6. J100 . . . J800 Pin Description
Pin No. Net-Name at Schematics Description
1 OUT−1 Speaker negative output
2 OUT−2 Speaker positive output
2.3 Line Out Connectors (J950 and J951)
Figure 2−6. J950 and J951 Pin Numbers
2
1
4
(PCB connector top view)
Table 2−7. J950 and J952 Pin Description
3
2-4
Pin No. Net-Name at Schematics Description
1 GND Ground
2 OUT Line out signal
3 OUT Line out signal
4
OUT Line out signal
2.4 Headphone Connector (J900)
Figure 2−7. J900 Pin Numbers
Headphone Connector (J900)
1
Table 2−8. J900 Pin Description
Pin No. Net-Name at Schematics Description
1 OUT−L Left headphone output
2 GND Ground
3 — For future use
4
2.5 Line Output Select (J50)
Figure 2−8. J50 Pin Numbers
Table 2−9. J50 Pin Description
Pin No. Description
1−2 Line outputs enabled
2−3 Line outputs disabled
2
(PCB connector top view)
OUT−R Right headphone output
3
4
2.6 Headphone Select (J32)
Figure 2−9. J32 Pin Numbers
Table 2−10.J32 Pin Description
Pin No. Description
1−2 Headphone enabled
2−3 Headphone disabled
System Interfaces
2-5
Control Interface (J30)
2.7 Control Interface (J30)
This interface connects the TAS5508−5121K8EVM board to a TI input board.
Table 2−11. J30 Pin Description
Pin
Net-Name at
No.
Schematics
1 GND Ground
2 PSVC−MCPU Power supply volume control from (mC) input board
3 GND Ground
4 RESET System reset (bidirectional). Activate MUTE before RESET for quiet reset.
5 BKND−ERR Backend error (or soft reset) provides reduced click and pop reset, without resetting I2C
6 MUTE Ramp volume from any setting to noiseless soft mute. Mute can also be activated by I2C.
7 PDN Power down. The TAS5508B goes to a power-down state when activated.
89RESERVED
10 SDA I2C data clock
11 GND Ground
12 SCL I2C bit clock
1314RESERVED
Description
volume register settings.
15 CONF−SEL Configuration select. Channel 5 and 6 speaker outputs active and line outputs inactive
when high. Line outputs active and channel 5 and 6 speaker outputs inactive when low.
16 RESERVED
17 GND Ground
1819RESERVED
20 SD1 Shutdown error reporting for front left, front right, and center channels. Activated if the
TAS5121 has high current or high temperature. See Chapter 3.
21 SD2 Shutdown error reporting for rear left, rear right, surround left, surround right, and
subwoofer channels. Activated if TAS5121 has high current or high temperature. See
Chapter 3.
22 OTW Temperature warning. Activated if one or more TAS5121 has reached the temperature
warning level.
23 RESERVED
24 HP−SEL Headphone select. Headphone is active when low and inactive when high.
2526GND Ground
27
RESERVED
28
29
30
3132GND Ground
3334+5V 5-V dc power supply (output)
2-6
Digital Audio Interface (J40)
2.8 Digital Audio Interface (J40)
The digital audio interface contains digital audio signal data (I2S), clocks, etc.
See the TAS5508B Data Manual (SLES162) for signal timing and details not
explained in this document.
Table 2−12.J40 Pin Description
Pin
Net-Name at
No.
Schematics
1 GND Ground
2 MCLK Master clock input. Low-jitter system clock for PWM generation and reclocking.
3 GND Ground
4 SDIN1 I2S data 1, channel 1 and 2
5 SDIN2 I2S data 2, channel 3 and 4
6 SDIN3 I2S data 3, channel 5 and 6
7 SDIN4 I2S data 4, channel 7 and 8
8 Reserved
9 Reserved
10 GND Ground
11 SCLK I2S bit clock
12 GND Ground
13 LRCLK I2S left−right clock
14 GND Ground
15 Reserved
16 GND Ground
Description
Ground connection from source to the TAS5508B must be a low-impedance
connection.
System Interfaces
2-7
2-8
Chapter 3
Protection
This chapter describes the short-circuit protection and fault-reporting circuitry
of the TAS5121 device.
Topic Page
3.1 Short-Circuit Protection and Fault-Reporting Circuitry 3-2. . . . . . . . . . .
3.2 Device Fault Reporting 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Protection
3-1
Short-Circuit Protection and Fault-Reporting Circuitry
3.1 Short-Circuit Protection and Fault-Reporting Circuitry
The TAS5121 is a self-protecting device that provides device fault reporting
(including high-temperature protection and short-circuit protection). The
TAS5121 is configured in back-end auto-recovery mode and, therefore, resets
automatically after all errors (M1, M2, and M3 is set low). This means that the
device restarts itself after an error occasion and reports shortly through SD1
and SD2 error signals.
The shutdown report signals are separated into two wires, SD1
covers the primary information channels (front channels and center), where
the SD2
surround/line out channels, and subwoofer). Therefore, a microprocessor can
react differently on errors depending on primary or secondary channels faults,
e.g., lowering the output level or shutting down the secondary channels on
continues error reporting from one of those, where the primary channels
continue.
covers the secondary information channels (rear channels,
and SD2. SD1
3-2
3.2 Device Fault Reporting
The OTW and SD outputs from the TAS5121 indicate fault conditions. See the
TAS5121 data sheet (SLES086) for a description of these pins.
The temperature warning signals at the TAS5508−5121K8EVM board are
wired-OR to one temperature warning signal [OTW
connector (J30)].
Device Fault Reporting
– pin 22 in control interface
Shutdown signals are wired-OR into two shutdown signals [SD1
20 and pin 21 in control interface connector (J30)]. See Table 3−1 for channel
allocation.
Table 3−1. Channel Allocation
Description Terminal Shutdown Signal
Front left J100 SD1
Front right J200 SD1
Rear left J300 SD2
Rear right J400 SD2
Surround left (or line out left) J500 SD2
Surround right (or line out right) J600 SD2
Center J700 SD1
Subwoofer J800 SD2
The shutdown signals, together with the temperature warning signal, give chip
state information as described in Table 3−2. Device fault reporting outputs are
open-drain outputs.
Table 3−2. TAS5121 Warning/Error Signal Decoding
OTW SDx Device Condition
0 0 High-temperature error and/or high-current error
0 1 High-temperature warning
1 0 Undervoltage lockout or high-current error
1 1 Normal operation, no errors/warnings
and SD2 – pin
Protection
3-3
3-4
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