ad5758.txt

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    1 Analog Devices AD5758 DAC device driver
    2 
    3 Required properties for the AD5758:
    4         - compatible: Must be "adi,ad5758"
    5         - reg: SPI chip select number for the device
    6         - spi-max-frequency: Max SPI frequency to use (< 50000000)
    7         - spi-cpha: is the only mode that is supported
    8 
    9 Required properties:
   10 
   11  - adi,dc-dc-mode: Mode of operation of the dc-to-dc converter
   12                    Dynamic Power Control (DPC)
   13                    In this mode, the AD5758 circuitry senses the output
   14                    voltage and dynamically regulates the supply voltage,
   15                    VDPC+, to meet compliance requirements plus an optimized
   16                    headroom voltage for the output buffer.
   17 
   18                    Programmable Power Control (PPC)
   19                    In this mode, the VDPC+ voltage is user-programmable to
   20                    a fixed level that needs to accommodate the maximum output
   21                    load required.
   22 
   23                    The output of the DAC core is either converted to a
   24                    current or voltage output at the VIOUT pin. Only one mode
   25                    can be enabled at any one time.
   26 
   27                    The following values are currently supported:
   28                         * 1: DPC current mode
   29                         * 2: DPC voltage mode
   30                         * 3: PPC current mode
   31 
   32  Depending on the selected output mode (voltage or current) one of the
   33  two properties must
   34  be present:
   35 
   36  - adi,range-microvolt: Voltage output range
   37                 The array of voltage output ranges must contain two fields:
   38                 * <0 5000000>: 0 V to 5 V voltage range
   39                 * <0 10000000>: 0 V to 10 V voltage range
   40                 * <(-5000000) 5000000>: ±5 V voltage range
   41                 * <(-10000000) 10000000>: ±10 V voltage range
   42  - adi,range-microamp: Current output range
   43                 The array of current output ranges must contain two fields:
   44                 * <0 20000>: 0 mA to 20 mA current range
   45                 * <0 24000>: 0 mA to 24 mA current range
   46                 * <4 24000>: 4 mA to 20 mA current range
   47                 * <(-20000) 20000>: ±20 mA current range
   48                 * <(-24000) 24000>: ±24 mA current range
   49                 * <(-1000) 22000>: −1 mA to +22 mA current range
   50 
   51 Optional properties:
   52 
   53  - reset-gpios : GPIO spec for the RESET pin. If specified, it will be
   54                  asserted during driver probe.
   55 
   56  - adi,dc-dc-ilim-microamp: The dc-to-dc converter current limit
   57                    The following values are currently supported [uA]:
   58                         * 150000
   59                         * 200000
   60                         * 250000
   61                         * 300000
   62                         * 350000
   63                         * 400000
   64 
   65  - adi,slew-time-us: The time it takes for the output to reach the
   66  full scale [uS]
   67                      The supported range is between 133us up to 1023984375us
   68 
   69 AD5758 Example:
   70 
   71         dac@0 {
   72                 compatible = "adi,ad5758";
   73                 reg = <0>;
   74                 spi-max-frequency = <1000000>;
   75                 spi-cpha;
   76 
   77                 reset-gpios = <&gpio 22 0>;
   78 
   79                 adi,dc-dc-mode = <2>;
   80                 adi,range-microvolt = <0 10000000>;
   81                 adi,dc-dc-ilim-microamp = <200000>;
   82                 adi,slew-time-us = <125000>;
   83         };

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sys/contrib/device-tree/Bindings/iio/dac/ad5758.txt