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HT86A36 Arkusz danych(PDF) 43 Page - Holtek Semiconductor Inc |
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HT86A36 Arkusz danych(HTML) 43 Page - Holtek Semiconductor Inc |
43 / 68 page HT86Axx/HT86ARxx Rev. 1.10 43 December 12, 2012 SP+/SP- AMP_EN tR tR For battery based applications, power consumption is a key issue, therefore the amplifier should be turned off when in the standby state. In order to eliminate any speaker sound bursts while turning the amplifier on, the application circuit, which will incorporate a capacitance value of C1, should be adjusted in accordance with the speaker s audio frequency response. A greater value of C1 will improve the noise burst while turning on the am- plifier. The recommended operation sequence is: Turn On: audio signal standby (1/2VDD) ® enable am- plifier ® wait tR for amplifier ready ® audio output Turn Off: audio signal finished ® disable amplifier ® wait tR for amplifier off ® audio signal off If the application is not powered by batteries and there is no problem with amplifier On/Off issues, a capacitor value of 0.1 mF for C1 is recommended. Analog to Digital Converter The need to interface to real world analog signals is a common requirement for many electronic systems. However, to properly process these signals by a microcontroller, they must first be converted into digital signals by A/D converters. By integrating the A/D con- version electronic circuitry into the microcontroller, the need for external components is reduced significantly with the corresponding follow-on benefits of lower costs and reduced component space requirements. A/D Overview The devices contain a 4-channel analog to digital con- verter which can directly interface to external analog sig- nals, such as that from sensors or other control signals and convert these signals directly into either a 12-bit dig- ital value. The following diagram shows the overall internal struc- ture of the A/D converter, together with its associated registers. A/D Converter Data Registers - ADRL, ADRH The devices have a 12-bit A/D converter, two registers are required, a high byte register, known as ADRH , and a low byte register, known as ADRL. After the conver- sion process takes place, these registers can be directly read by the microcontroller to obtain the digitized con- version value. They use two A/D Converter Data Regis- ters, note that only the high byte register ADRH utilises its full 8-bit contents. The low byte register ADRL uti- lises only 4 of its 8-bit contents as it contains only the lower 4 bit of the 12-bit converted value. A D C S o u r c e f O S C ¸ 2 ~ ¸ 3 2 A C S R R e g i s t e r A D C V D D A / D r e f e r e n c e v o l t a g e A D R L A D R H A / D D a t a R e g i s t e r s P C R 0 ~ P C R 2 A C S 0 ~ A C S 1 S T A R T E O C A D C R R e g i s t e r P i n C o n f i g u r a t i o n B i t s C h a n n e l S e l e c t B i t s S t a r t a n d E n d o f C o n v e r s i o n B i t s C l o c k D i v i d e R a t i o P C 0 / A N 0 P C 1 / A N 1 P C 2 / A N 2 P C 3 / A N 3 A/D Converter Structure |
Podobny numer części - HT86A36_12 |
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Podobny opis - HT86A36_12 |
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