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HT813D0 Datasheet(PDF) 8 Page - Holtek Semiconductor Inc |
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HT813D0 Datasheet(HTML) 8 Page - Holtek Semiconductor Inc |
8 / 12 page • Busy output When a voice group is playing, the outputs of both FLAG1 and FLAG2 are turned low, indi- cating 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: • Voice indicator output FLAG1 is active low when voices are playing. FLAG1 is also turned low when a voice section is output. The brightness of FLAG1 varies with the volume. FLAG1 becomes floating af- ter the silence section is output or the voice output is terminated. • 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 requirements. 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 purpose of controlling the volume of each section output after the volume control function is chosen. There are two volume op- tions, namely, full range and half range. AUD The AUD pin is a PMOS open drain structure. It outputs voice signals to drive a speaker through an external NPN transistor when the chip is active. However, the AUD pin becomes a floating output when the chip is in the standby state. The 8050 type transistor with hFE ≅150 is rec- ommended for an output driver. HT813D0 8 5th May ’98 |
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