# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/dac/adi,ltc2664.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Analog Devices LTC2664 DAC
maintainers:
- Michael Hennerich <[email protected]>
- Kim Seer Paller <[email protected]>
description: |
Analog Devices LTC2664 4 channel, 12-/16-Bit, +-10V DAC
https://www.analog.com/media/en/technical-documentation/data-sheets/2664fa.pdf
properties:
compatible:
enum:
- adi,ltc2664
reg:
maxItems: 1
spi-max-frequency:
maximum: 50000000
vcc-supply:
description: Analog Supply Voltage Input.
v-pos-supply:
description: Positive Supply Voltage Input.
v-neg-supply:
description: Negative Supply Voltage Input.
iovcc-supply:
description: Digital Input/Output Supply Voltage.
ref-supply:
description:
Reference Input/Output. The voltage at the REF pin sets the full-scale
range of all channels. If not provided the internal reference is used and
also provided on the VREF pin.
reset-gpios:
description:
Active-low Asynchronous Clear Input. A logic low at this level-triggered
input clears the part to the reset code and range determined by the
hardwired option chosen using the MSPAN pins. The control registers are
cleared to zero.
maxItems: 1
adi,manual-span-operation-config:
description:
This property must mimic the MSPAN pin configurations. By tying the MSPAN
pins (MSP2, MSP1 and MSP0) to GND and/or VCC, any output range can be
hardware-configured with different mid-scale or zero-scale reset options.
The hardware configuration is latched during power on reset for proper
operation.
0 - MPS2=GND, MPS1=GND, MSP0=GND (+-10V, reset to 0V)
1 - MPS2=GND, MPS1=GND, MSP0=VCC (+-5V, reset to 0V)
2 - MPS2=GND, MPS1=VCC, MSP0=GND (+-2.5V, reset to 0V)
3 - MPS2=GND, MPS1=VCC, MSP0=VCC (0V to 10, reset to 0V)
4 - MPS2=VCC, MPS1=GND, MSP0=GND (0V to 10V, reset to 5V)
5 - MPS2=VCC, MPS1=GND, MSP0=VCC (0V to 5V, reset to 0V)
6 - MPS2=VCC, MPS1=VCC, MSP0=GND (0V to 5V, reset to 2.5V)
7 - MPS2=VCC, MPS1=VCC, MSP0=VCC (0V to 5V, reset to 0V, enables SoftSpan)
$ref: /schemas/types.yaml#/definitions/uint32
enum: [0, 1, 2, 3, 4, 5, 6, 7]
default: 7
io-channels:
description:
ADC channel to monitor voltages and temperature at the MUXOUT pin.
maxItems: 1
'#address-cells':
const: 1
'#size-cells':
const: 0
patternProperties:
"^channel@[0-3]$":
$ref: dac.yaml
type: object
additionalProperties: false
properties:
reg:
description: The channel number representing the DAC output channel.
maximum: 3
adi,toggle-mode:
description:
Set the channel as a toggle enabled channel. Toggle operation enables
fast switching of a DAC output between two different DAC codes without
any SPI transaction.
type: boolean
output-range-microvolt:
description:
This property is only allowed when SoftSpan is enabled. If not present,
[0, 5000000] is the default output range.
oneOf:
- items:
- const: 0
- enum: [5000000, 10000000]
- items:
- const: -5000000
- const: 5000000
- items:
- const: -10000000
- const: 10000000
- items:
- const: -2500000
- const: 2500000
required:
- reg
allOf:
- if:
not:
properties:
adi,manual-span-operation-config:
const: 7
then:
patternProperties:
"^channel@[0-3]$":
properties:
output-range-microvolt: false
required:
- compatible
- reg
- spi-max-frequency
- vcc-supply
- iovcc-supply
- v-pos-supply
- v-neg-supply
allOf:
- $ref: /schemas/spi/spi-peripheral-props.yaml#
additionalProperties: false
examples:
- |
spi {
#address-cells = <1>;
#size-cells = <0>;
dac@0 {
compatible = "adi,ltc2664";
reg = <0>;
spi-max-frequency = <10000000>;
vcc-supply = <&vcc>;
iovcc-supply = <&vcc>;
ref-supply = <&vref>;
v-pos-supply = <&vpos>;
v-neg-supply = <&vneg>;
io-channels = <&adc 0>;
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0>;
adi,toggle-mode;
output-range-microvolt = <(-10000000) 10000000>;
};
channel@1 {
reg = <1>;
output-range-microvolt= <0 10000000>;
};
};
};
...
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