參數(shù)資料
型號： TDA7567PDTR
廠商： STMICROELECTRONICS
元件分類： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PDSO36
封裝： ROHS COMPLIANT, SOP-36
文件頁數(shù)： 4/30頁
文件大小： 346K
代理商： TDA7567PDTR
Diagnostics functional description
TDA7567PD
Doc ID 16903 Rev 1
3
Diagnostics functional description
3.1
Turn-on diagnostic
It is activated at the turn-on (standby out) under I2C bus request. Detectable output faults
are:
●
Short to GND
●
Short to Vs
●
Short across the speaker
●
Open speaker
To verify if any of the above misconnections are in place, a subsonic (inaudible) current
pulse (Figure 5) is internally generated, sent through the speaker(s) and sunk back. The
turn-on diagnostic status is internally stored until a successive diagnostic pulse is requested
(after a I2C reading).
If the "standby out" and "diagnostic enable" commands are both given through a single
programming step, the pulse takes place first (power stage still in standby mode, low,
outputs= high impedance).
Afterwards, when the amplifier is biased, the PERMANENT diagnostic takes place. The
previous turn-on state is kept until a short appears at the outputs.
Figure 5.
Turn-on diagnostic: working principle
Figure 6 and 7 show SVR and output waveforms at the turn-on (standby out) with and
without turn-on diagnostic.
Figure 6.
SVR and output behavior (case 1: without turn-on diagnostic)
CH-
CH+
Isource
Vs~5V
Isink
t (ms)
I (mA)
Isink
Isource
~100mS
Measure time
Bias (power amp turn-on)
t
Diagnostic Enable
(Permanent)
Permanent diagnostic
acquisition time (100mS Typ)
Permanent Diagnostics data (output)
permitted time
I2CB DATA
Vsvr
Out
FAULT
event
Read Data
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