TDA8595_15 Datasheet, PDF (16/51 Pages) NXP Semiconductors – I2C-bus controlled 4  45 W power amplifier

NXP Semiconductors
30
G_v
(dB)
20
TDA8595
I²C-bus controlled 4  45 W power amplifier
001aad174
10
0
145
155
Fig 11. Temperature controlled amplifier gain
165
175
T_j (°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 microprocessor can read the
failure information via the I²C-bus (the DIAG pin can be used as 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
STB pin
Power-On Reset
(POR)
after power-on reset, no
DIAG pin will remain
LOW until amplifier has
been started
Low battery
yes
no
Clip detection
can be enabled per
channel
can be enabled per
channel
Temperature pre-
can be enabled
no
warning
Short
can be enabled
no
Legacy mode
DIAG pin
no
yes
yes, fixed level for all
channels on 2 %
yes, pre-warning level
is 145 C
yes
TDA8595
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 11 June 2013
© NXP B.V. 2013. All rights reserved.
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