汽车音响内置音效IC TA8276HQ 歌乐机头OEM芯片电路图技术资料
TA8276HQ4. AUX Input (pin 16)The pin 16 is for input terminal of AUX amplifier. The total gain is 0 dB by using of AUX amplifier. Therefore, the µ-COM can directly drive the AUX amplifier. BEEP sound or voice synthesizer signal can be input to pin 16 directly. When AUX function is not used, this pin must be connected to PRE-GND (pin 13) via a capacitor.20 dB AMP.IN OUT (+)OUT ( ) AUX AMP µ-COM AUX-IN 16 20 dBFigure 6 AUX Input5.Diagnosis Output (pin 25)This diagnosis output terminal of pin 25 has open collector output structure on chip as shown in Figure 7. In case diagnosis circuit that detect unusual case is operated, NPN Tr. (Q1) is turned on. It is possible to protect all the system of apparatus as well as power IC protection. In case of being unused this function, use this IC as open-connection on pin 25.5V25 V25 OUTPUT CLIP DETECTOR OUTPUT SHORT PROTECTOR OVER VOLTAGE PROTECTOR GND t Q1 is turned on Q1 5Vpin 25: Open collector output (active low)Figure 75.1Self Diagnosis OutputIn Case of Shorting Output to VCC/GND or Over Voltage Power SuppliedNPN Tr. (Q1) is turned on. Threshold of over voltage protection: VCC = 22 V (typ.)5V µ-COM LED/LCD ALAME (Flashing) (Announcement from a speaker.) OFF (Relay OFF)25REGULATOR MEMORY (Count and record)Figure 85.2Application 1In Case of Shorting Output to OutputNPN Tr. (Q1) is turned on and off in response to the input signal voltage.52004-05-10
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