參數(shù)資料
型號(hào)： TDA7567PD
廠商： STMICROELECTRONICS
元件分類(lèi)： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PDSO36
封裝： ROHS COMPLIANT, SOP-36
文件頁(yè)數(shù)： 6/30頁(yè)
文件大?。?/td> 346K
代理商： TDA7567PD
Diagnostics functional description
TDA7567PD
Doc ID 16903 Rev 1
3.2
Permanent diagnostics
Detectable conventional faults are:
–
Short to GND
–Short to Vs
–
Short across the speaker
The following additional features are provided:
–
Output offset detection
The TDA7567PD has 2 operating status:
1.
RESTART mode. The diagnostic is not enabled. Each audio channel operates
independently from each other. If any of the a.m. faults occurs, only the channel(s)
interested is shut down. A check of the output status is made every 1 ms (Figure 11).
Restart takes place when the overload is removed.
2.
DIAGNOSTIC mode. It is enabled via I2C bus and self activates if an output overload
(such to cause the intervention of the short-circuit protection) occurs to the speakers
outputs. Once activated, the diagnostics procedure develops as follows (Figure 12):
–
To avoid momentary re-circulation spikes from giving erroneous diagnostics, a
check of the output status is made after 1ms: if normal situation (no overloads) is
detected, the diagnostic is not performed and the channel returns back active.
–
Instead, if an overload is detected during the check after 1 ms, then a diagnostic
cycle having a duration of about 100 ms is started.
–
After a diagnostic cycle, the audio channel interested by the fault is switched to
RESTART mode. The relevant data are stored inside the device and can be read
by the microprocessor. When one cycle has terminated, the next one is activated
by an I2C reading. This is to ensure continuous diagnostics throughout the car-
radio operating time.
–
To check the status of the device a sampling system is needed. The timing is
chosen at microprocessor level (over half a second is recommended).
Figure 11. Restart timing without diagnostic enable (permanent) - Each 1ms time, a
sampling of the fault is done
Figure 12. Restart timing with diagnostic enable (permanent)
t
1-2mS
1mS
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Short circuit removed
Out
t
Overcurrent and short
circuit protection intervention
(i.e. short circuit to GND)
Short circuit removed
1-2mS
100/200mS
1mS
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