1 What: /sys/bus/iio/devices/iio:devic 1 What: /sys/bus/iio/devices/iio:deviceX/boost_current_gain
2 KernelVersion: 6.4 2 KernelVersion: 6.4
3 Contact: linux-iio@vger.kernel.org 3 Contact: linux-iio@vger.kernel.org
4 Description: 4 Description:
5 This attribute is used to set 5 This attribute is used to set the gain of the biasing current
6 circuit of the Delta-Sigma mod 6 circuit of the Delta-Sigma modulator. The different BOOST
7 settings are applied to the en 7 settings are applied to the entire modulator circuit, including
8 the voltage reference buffers. 8 the voltage reference buffers.
9 9
10 What: /sys/bus/iio/devices/iio:devic 10 What: /sys/bus/iio/devices/iio:deviceX/boost_current_gain_available
11 KernelVersion: 6.4 11 KernelVersion: 6.4
12 Contact: linux-iio@vger.kernel.org 12 Contact: linux-iio@vger.kernel.org
13 Description: 13 Description:
14 Reading returns a list with th 14 Reading returns a list with the possible gain values for
15 the current biasing circuit of 15 the current biasing circuit of the Delta-Sigma modulator.
16 16
17 What: /sys/bus/iio/devices/iio:devic 17 What: /sys/bus/iio/devices/iio:deviceX/auto_zeroing_mux_enable
18 KernelVersion: 6.4 18 KernelVersion: 6.4
19 Contact: linux-iio@vger.kernel.org 19 Contact: linux-iio@vger.kernel.org
20 Description: 20 Description:
21 This attribute is used to enab 21 This attribute is used to enable the analog input multiplexer
22 auto-zeroing algorithm (the in 22 auto-zeroing algorithm (the input multiplexer and the ADC
23 include an offset cancellation 23 include an offset cancellation algorithm that cancels the offset
24 contribution of the ADC). When 24 contribution of the ADC). When the offset cancellation algorithm
25 is enabled, ADC takes two conv 25 is enabled, ADC takes two conversions, one with the differential
26 input as VIN+/VIN-, one with V 26 input as VIN+/VIN-, one with VIN+/VIN- inverted. In this case the
27 conversion time is multiplied 27 conversion time is multiplied by two compared to the default
28 case where the algorithm is di 28 case where the algorithm is disabled. This technique allows the
29 cancellation of the ADC offset 29 cancellation of the ADC offset error and the achievement of
30 ultra-low offset without any d 30 ultra-low offset without any digital calibration. The resulting
31 offset is the residue of the d 31 offset is the residue of the difference between the two
32 conversions, which is on the o 32 conversions, which is on the order of magnitude of the noise
33 floor. This offset is effectiv 33 floor. This offset is effectively canceled at every conversion,
34 so the residual offset error t 34 so the residual offset error temperature drift is extremely low.
35 Write '1' to enable it, write 35 Write '1' to enable it, write '0' to disable it.
36 36
37 What: /sys/bus/iio/devices/iio:devic 37 What: /sys/bus/iio/devices/iio:deviceX/auto_zeroing_ref_enable
38 KernelVersion: 6.4 38 KernelVersion: 6.4
39 Contact: linux-iio@vger.kernel.org 39 Contact: linux-iio@vger.kernel.org
40 Description: 40 Description:
41 This attribute is used to enab 41 This attribute is used to enable the chopping algorithm for the
42 internal voltage reference buf 42 internal voltage reference buffer. This setting has no effect
43 when external voltage referenc 43 when external voltage reference is selected.
44 Internal voltage reference buf 44 Internal voltage reference buffer injects a certain quantity of
45 1/f noise into the system that 45 1/f noise into the system that can be modulated with the
46 incoming input signals and can 46 incoming input signals and can limit the SNR performance at
47 higher Oversampling Ratio valu 47 higher Oversampling Ratio values (over 256). To overcome this
48 limitation, the buffer include 48 limitation, the buffer includes an auto-zeroing algorithm that
49 greatly reduces (cancels out) 49 greatly reduces (cancels out) the 1/f noise and cancels the
50 offset value of the reference 50 offset value of the reference buffer. As a result, the SNR of
51 the system is not affected by 51 the system is not affected by this 1/f noise component of the
52 reference buffer, even at maxi 52 reference buffer, even at maximum oversampling ratio values.
53 Write '1' to enable it, write 53 Write '1' to enable it, write '0' to disable it.
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