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AD7879 Folha de dados(PDF) 23 Page - Analog Devices |
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AD7879 Folha de dados(HTML) 23 Page - Analog Devices |
23 / 40 page Data Sheet AD7879/AD7889 Rev. D | Page 23 of 40 Table 13. Control Register 2 Address Bit Name Data Bit Description Default Value 0x02 PM[1:0] [15:14] ADC power management. 0x4040 00 = full shutdown; the ADC, oscillator, bias, and temperature sensor are all powered down. 01 = analog blocks to be powered down depend on the ADC mode. If ADC mode is master mode, the ADC, oscillator, bias, and temperature sensor are powered down and must wake up when the user touches the screen. If ADC mode is slave mode, the ADC and temperature sensor are powered down when not being used. They wake up automatically when required. The oscillator and bias are powered up because they are needed to measure time. This also applies to the single-conversion mode. 10 = ADC, bias, and oscillator are powered up continuously, irrespective of ADC mode. 11 = same as 01. GPIO EN 13 GPIO enable. 0 = AUX/VBAT channel active. 1 = GPIO enabled on AUX/VBAT/GPIO pin. GPIO DAT 12 GPIO data bit. GPIO DIR 11 GPIO direction. 0 = output. 1 = input. GPIO POL 10 GPIO polarity. 0 = GPIO pin is active low. 1 = GPIO pin is active high. SER/DFR 9 Selects normal (single-ended) or ratiometric (differential) conversion. 0 = ratiometric (differential). 1 = normal (single-ended). AVG[1:0] [8:7] ADC averaging. 00 = 2 middle values averaged (one measurement when median filter is disabled). 01 = 4 middle values averaged. 10 = 8 middle values averaged. 11 = 16 values averaged. MED[1:0] [6:5] Median filter size. 00 = median filter disabled. 01 = 4 measurements. 10 = 8 measurements. 11 = 16 measurements. SW/RST 4 Software reset; digital logic is reset when this bit is set. FCD[3:0] [3:0] ADC first conversion delay.1 Starts at 128 µs (default) and continues to 4.096 ms in steps of 128 µs (see Table 22). 1 This delay occurs before conversion of the X and Y coordinate channels (including Z1 and Z2) to allow screen settling and before the first conversion to allow the ADC to power up. |
Nº de peça semelhante - AD7879_17 |
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Descrição semelhante - AD7879_17 |
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