75 lines
3.1 KiB
ReStructuredText
75 lines
3.1 KiB
ReStructuredText
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Kernel driver ina3221
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=====================
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Supported chips:
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* Texas Instruments INA3221
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Prefix: 'ina3221'
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Addresses: I2C 0x40 - 0x43
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Datasheet: Publicly available at the Texas Instruments website
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https://www.ti.com/
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Author: Andrew F. Davis <afd@ti.com>
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Description
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-----------
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The Texas Instruments INA3221 monitors voltage, current, and power on the high
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side of up to three D.C. power supplies. The INA3221 monitors both shunt drop
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and supply voltage, with programmable conversion times and averaging, current
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and power are calculated host-side from these.
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Sysfs entries
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-------------
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======================= =======================================================
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in[123]_label Voltage channel labels
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in[123]_enable Voltage channel enable controls
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in[123]_input Bus voltage(mV) channels
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curr[123]_input Current(mA) measurement channels
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shunt[123]_resistor Shunt resistance(uOhm) channels
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curr[123]_crit Critical alert current(mA) setting, activates the
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corresponding alarm when the respective current
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is above this value
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curr[123]_crit_alarm Critical alert current limit exceeded
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curr[123]_max Warning alert current(mA) setting, activates the
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corresponding alarm when the respective current
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average is above this value.
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curr[123]_max_alarm Warning alert current limit exceeded
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in[456]_input Shunt voltage(uV) for channels 1, 2, and 3 respectively
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in7_input Sum of shunt voltage(uV) channels
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in7_label Channel label for sum of shunt voltage
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curr4_input Sum of current(mA) measurement channels,
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(only available when all channels use the same resistor
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value for their shunt resistors)
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curr4_crit Critical alert current(mA) setting for sum of current
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measurements, activates the corresponding alarm
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when the respective current is above this value
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(only effective when all channels use the same resistor
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value for their shunt resistors)
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curr4_crit_alarm Critical alert current limit exceeded for sum of
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current measurements.
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samples Number of samples using in the averaging mode.
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Supports the list of number of samples:
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1, 4, 16, 64, 128, 256, 512, 1024
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update_interval Data conversion time in millisecond, following:
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update_interval = C x S x (BC + SC)
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* C: number of enabled channels
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* S: number of samples
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* BC: bus-voltage conversion time in millisecond
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* SC: shunt-voltage conversion time in millisecond
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Affects both Bus- and Shunt-voltage conversion time.
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Note that setting update_interval to 0ms sets both BC
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and SC to 140 us (minimum conversion time).
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======================= =======================================================
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