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TDF8599 数据表(PDF) 18 Page - NXP Semiconductors

部件名 TDF8599
功能描述  I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier with load diagnostics
PDF  52 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

TDF8599 数据表(HTML) 18 Page - NXP Semiconductors

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TDF8599_1
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 01 — 13 November 2008
18 of 52
NXP Semiconductors
TDF8599
Class-D power amplifier with load diagnostics
8.6 Diagnostic output
8.6.1 Diagnostic table
The diagnostic information for I2C-bus mode and non-I2C-bus mode is shown in Table 11.
The instruction bitmap and data bytes are described in Table 14 and Table 15.
Pins DIAG and CLIP have an open-drain output which must have an external pull-up
resistor connected to an external voltage. Pins CLIP and DIAG can show both fixed and
I2C-bus selectable information.
Pin DIAG goes LOW when a short circuit to one of the amplifier outputs occurs. The
microprocessor reads the failure information using the I2C-bus. The I2C-bus bits are set
for a short circuit. These bits can be reset with the I2C-bus read command.
Even after the short has been removed, the microprocessor knows what was wrong after
reading the I2C-bus. In principle, during a single I2C-bus read command, the old
information is read. To read the current information, two read commands must be sent,
one-after-another.
When selected, pin DIAG gives the current diagnostic information. Pin DIAG is released
instantly when the failure is removed, independent of the I2C-bus latches.
When OCP is triggered, the open-drain DIAG output is activated. The diagnostic output
signal during different short circuit conditions is illustrated in Figure 16.
Table 11.
Available data at DIAG and CLIP pin
Diagnostic
I2C-bus mode
Non-I2C-bus mode
DIAG
CLIP
DIAG
CLIP
Power-on reset
yes
no
yes
no
UVP or OVP
yes
no
yes
no
Clip detection
no
selectable
no
yes
Temperature pre-warning
no
selectable
no
yes
OCP
yes
no
yes
no
DCP
selectable
no
yes
no
OTP
yes
no
yes
no
Fig 16. Diagnostic output for short circuit conditions
001aai786
AMPLIFIER
RESTART
shorted load
pull up V
AGND = 0 V
≈50 ms
≈50 ms
≈50 ms
NO
RESTART
short to GND or VP line



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