TDA8594 데이터 시트보기 (PDF) - NXP Semiconductors.
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TDA8594 Datasheet PDF : 48 Pages
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NXP Semiconductors
30
Gv
(dB)
20
TDA8594
I2C-bus controlled 4 × 50 W power amplifier
001aad174
10
0
145
155
Fig 10. Temperature controlled amplifier gain
165
175
Tj (°C)
7.13 Diagnostics
Diagnostic information can be read via the I2C-bus, and can also be available on the DIAG
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 I2C-bus, selectable information (temperature,
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 I2C-bus (the DIAG pin can be used as a microprocessor interrupt
to minimize I2C-bus traffic). When the failure is removed, the DIAG pin will be released.
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.
Table 4. Diagnostic information availability
Diagnostic information I2C-bus mode
DIAG pin
POR
after power-on reset, DIAG
pin will remain LOW until
amplifier has been started
Low battery
yes
Clip detection
can be enabled per channel
Temperature
pre-warning
Short
Speaker protection
(missing current)
can be enabled
can be enabled
can be enabled
STB pin
no
Legacy mode
DIAG pin
no
no
can be enabled
per channel
no
no
no
yes
yes, fixed level for all
channels on 2 %
yes, pre-warning level
is 145 °C
yes
yes
TDA8594_2
Product data sheet
Rev. 02 — 11 December 2007
© NXP B.V. 2007. All rights reserved.
15 of 48
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