TDA8594 NXP Semiconductors, TDA8594 Datasheet - Page 15

• Manufacturer Part Number: TDA8594
• Description: The TDA8594 is a complementary quad Bridge Tied Load (BTL) audio power amplifiermade in BCDMOS technology
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA8594_2
Product data sheet
7.13 Diagnostics
Diagnostic information can be read via the I
pin or on the STB pin. The DIAG pin has both fixed information (power-on reset occurred,
low battery and high battery) and, via the I
load fault and clip). This information will be seen at the DIAG pin as a logic OR. In case of
a failure, the DIAG pin remains LOW and the failure information can be read from the
microprocessor via the I
to minimize I
To have full control over the clipping information, the STB pin can be programmed as a
second clip detection pin. The clip detection level can be selected for all channels at once.
It is possible to select whether the clip information is available on the DIAG pin or on the
STB pin for each channel separately. It is, for instance, possible to distinguish between
clipping of the front and the rear channels.
Diagnostic information selection possibilities are shown in
Table 4.
Diagnostic information I
POR
Low battery
Clip detection
Temperature
pre-warning
Short
Speaker protection
(missing current)
Fig 10. Temperature controlled amplifier gain
(dB)
G
v
30
20
10
0
145
Diagnostic information availability
2
C-bus traffic). When the failure is removed, the DIAG pin will be released.
Rev. 02 — 11 December 2007
2
DIAG pin
after power-on reset, DIAG
pin will remain LOW until
amplifier has been started
yes
can be enabled per channel
can be enabled
can be enabled
can be enabled
2
C-bus (the DIAG pin can be used as a microprocessor interrupt
C-bus mode
155
2
I
2
C-bus, selectable information (temperature,
2
C-bus, and can also be available on the DIAG
C-bus controlled 4
STB pin
no
no
can be enabled
per channel
no
no
no
165
Table
T
4.
j
( C)
50 W power amplifier
Legacy mode
DIAG pin
no
yes
yes, fixed level for all
channels on 2 %
yes, pre-warning level
is 145 C
yes
yes
TDA8594
001aad174
© NXP B.V. 2007. All rights reserved.
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