@@ -17,10 +17,16 @@ The following chips are supported by this driver:
* `AD7381 <https://www.analog.com/en/products/ad7381.html>`_
* `AD7383 <https://www.analog.com/en/products/ad7383.html>`_
* `AD7384 <https://www.analog.com/en/products/ad7384.html>`_
+* `AD7386 <https://www.analog.com/en/products/ad7386.html>`_
+* `AD7387 <https://www.analog.com/en/products/ad7387.html>`_
+* `AD7388 <https://www.analog.com/en/products/ad7388.html>`_
* `AD7380-4 <https://www.analog.com/en/products/ad7380-4.html>`_
* `AD7381-4 <https://www.analog.com/en/products/ad7381-4.html>`_
* `AD7383-4 <https://www.analog.com/en/products/ad7383-4.html>`_
* `AD7384-4 <https://www.analog.com/en/products/ad7384-4.html>`_
+* `AD7386-4 <https://www.analog.com/en/products/ad7386-4.html>`_
+* `AD7387-4 <https://www.analog.com/en/products/ad7387-4.html>`_
+* `AD7388-4 <https://www.analog.com/en/products/ad7388-4.html>`_
Supported features
@@ -69,6 +75,42 @@ must restart iiod using the following command:
root:~# systemctl restart iiod
+Channel selection and sequencer (single-end chips only)
+-------------------------------------------------------
+
+Single-ended chips of this family (ad7386/7/8(-4)) have a 2:1 multiplexer in
+front of each ADC. They also include additional configuration registers that
+allow for either manual selection or automatic switching (sequencer mode), of
+the multiplexer inputs.
+
+From an IIO point of view, all inputs are exported, i.e ad7386/7/8
+export 4 channels and ad7386-4/7-4/8-4 export 8 channels.
+
+Inputs ``AinX0`` of multiplexers correspond to the first half of IIO channels (i.e
+0-1 or 0-3) and inputs ``AinX1`` correspond to second half (i.e 2-3 or 4-7).
+Example for AD7386/7/8 (2 channels parts):
+
+.. code-block::
+
+ IIO | AD7386/7/8
+ | +----------------------------
+ | | _____ ______
+ | | | | | |
+ voltage0 | AinA0 --|--->| | | |
+ | | | mux |----->| ADCA |---
+ voltage2 | AinA1 --|--->| | | |
+ | | |_____| |_____ |
+ | | _____ ______
+ | | | | | |
+ voltage1 | AinB0 --|--->| | | |
+ | | | mux |----->| ADCB |---
+ voltage3 | AinB1 --|--->| | | |
+ | | |_____| |______|
+ | |
+ | +----------------------------
+
+
+When enabling sequencer mode, the effective sampling rate is divided by two.
Unimplemented features
----------------------
The AD7380 family has some compatible single-ended chips: AD7386/7/8(-4). These single-ended chips have a 2:1 multiplexer in front of each ADC. They also include additional configuration registers that allow for either manual selection or automatic switching (sequencer mode), of the multiplexer inputs. Add a section to describe this. Signed-off-by: Julien Stephan <jstephan@baylibre.com> --- Documentation/iio/ad7380.rst | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+)