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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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HT81003 Datenblatt(PDF) 13 Page - Holtek Semiconductor Inc |
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HT81003 Datenblatt(HTML) 13 Page - Holtek Semiconductor Inc |
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13 / 19 page  HT81XXX Rev. 1.40 13 March 1, 2005 · 6Hz/6HzB flash When voices are playing, the FLAG1 pin outputs a 6Hz signal to drive a LED. The signal is active low, 25% duty. Once the voice output is terminated, the FLAG1 pin becomes a floating output. When the FLAG1 and the FLAG2 pins are optioned as 6HzB and 6Hz outputs, they will alternately output at a 6Hz rate. · Busy output When a voice group is playing, the outputs of both FLAG1 and FLAG2 are turned low, indicating that the chip is busy. In addition to the above-stated output signals, FLAG1 can also generate one of the following signals by code option: ¨ End-pulse output When the voice output is completed, the FLAG1 pin outputs an active low pulse. The pulse width can be programmed depending on the customer ¢s require- ments. The FLAG1 as well as FLAG2 pins are both floating outputs when the chip is in the standby state. Volume Control The function of the volume control can be set by mask option. A code is written in the function table for the pur- pose of controlling the volume of each section output af- ter the volume control function is chosen. There are two volume options, namely; full range and half range. I/O2 The I/O2 pin is a PWM structure. It outputs voice signals to drive a speaker through an external NPN transistor when the chip is active. The OUT1 and OUT2 pins are configured as PWM structure which can drive 8/16/32 W speaker directly. An 8050 type transistor with hFE @150 is recommended for an output driver. A U D F L A G : F l o a t i n g A U D F L A G : F l o a t i n g O U T 1 O S C I O U T 2 R O S C H T 8 1 X X X S P K O U T 3 S P K V D D O S C I R O S C H T 8 1 X X X A U D F L A G : F l o a t i n g |
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