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|
# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/iio/adc/maxim,max34408.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Maxim MAX34408/MAX34409 current monitors with overcurrent control
maintainers:
- Ivan Mikhaylov <fr0st61te@gmail.com>
description: |
The MAX34408/MAX34409 are two- and four-channel current monitors that are
configured and monitored with a standard I2C/SMBus serial interface. Each
unidirectional current sensor offers precision high-side operation with a
low full-scale sense voltage. The devices automatically sequence through
two or four channels and collect the current-sense samples and average them
to reduce the effect of impulse noise. The raw ADC samples are compared to
user-programmable digital thresholds to indicate overcurrent conditions.
Overcurrent conditions trigger a hardware output to provide an immediate
indication to shut down any necessary external circuitry.
Specifications about the devices can be found at:
https://www.analog.com/media/en/technical-documentation/data-sheets/MAX34408-MAX34409.pdf
properties:
compatible:
enum:
- maxim,max34408
- maxim,max34409
"#address-cells":
const: 1
"#size-cells":
const: 0
reg:
maxItems: 1
interrupts:
maxItems: 1
powerdown-gpios:
description:
Shutdown Output. Open-drain output. This output transitions to high impedance
when any of the digital comparator thresholds are exceeded as long as the ENA
pin is high.
maxItems: 1
powerdown-status-gpios:
description:
SHTDN Enable Input. CMOS digital input. Connect to GND to clear the latch and
unconditionally deassert (force low) the SHTDN output and reset the shutdown
delay. Connect to VDD to enable normal latch operation of the SHTDN output.
maxItems: 1
vdd-supply: true
patternProperties:
"^channel@[0-3]$":
$ref: adc.yaml
type: object
description:
Represents the internal channels of the ADC.
properties:
reg:
items:
- minimum: 0
maximum: 3
maxim,rsense-val-micro-ohms:
description:
Adjust the Rsense value to monitor higher or lower current levels for
input.
enum: [250, 500, 1000, 5000, 10000, 50000, 100000, 200000, 500000]
default: 1000
required:
- reg
- maxim,rsense-val-micro-ohms
unevaluatedProperties: false
required:
- compatible
- reg
allOf:
- if:
properties:
compatible:
contains:
const: maxim,max34408
then:
patternProperties:
"^channel@[2-3]$": false
"^channel@[0-1]$":
properties:
reg:
maximum: 1
else:
patternProperties:
"^channel@[0-3]$":
properties:
reg:
maximum: 3
additionalProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
adc@1e {
compatible = "maxim,max34409";
reg = <0x1e>;
powerdown-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
powerdown-status-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;
#address-cells = <1>;
#size-cells = <0>;
channel@0 {
reg = <0x0>;
maxim,rsense-val-micro-ohms = <5000>;
};
channel@1 {
reg = <0x1>;
maxim,rsense-val-micro-ohms = <10000>;
};
};
};
|
