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ADAR2001ACCZ-R7 데이터시트(PDF) 15 Page - Analog Devices |
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ADAR2001ACCZ-R7 데이터시트(HTML) 15 Page - Analog Devices |
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15 / 39 page ![]() Data Sheet ADAR2001 Rev. 0 | Page 15 of 39 ADC AND ADC CLOCK The ADAR2001 has an on-chip, 8-bit ADC and a variable clock input, each with their own enable control bits. To take a measurement from the ADC, the user must first write to the ADC_CTRL register, Register 0x04A. This register contains the following bits: • Bit 0: ADC_EOC (read only). This bit is a flag for when the ADC conversion is done. • Bit 1 to Bit 3: MUX_SEL (read/write). These bits are used to select the ADC input, according to Figure 27. • Bit 4: ST_CONV (read/write). This bit is set to start an ADC conversion cycle. • Bit 5: CLK_EN (read/write). This bit enables the ADC clock. • Bit 6: ADC_EN (read/write). This bit enables the ADC. • Bit 7: ADC_CLKFREQ_SEL (read/write). This bit sets the clock frequency. A low sets the clock to 2 MHz, whereas a high sets the clock to 250 kHz. After the ADC_CTRL register is written, it must be polled to wait for the ADC_EOC bit to go high. When this happens, the measured value can be read out from the ADC_OUTPUT register, Register 0x04B. |
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