104 lines
2.6 KiB
ReStructuredText
104 lines
2.6 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver tmp513
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====================
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Supported chips:
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* Texas Instruments TMP512
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Prefix: 'tmp512'
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Datasheet: http://www.ti.com/lit/ds/symlink/tmp512.pdf
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* Texas Instruments TMP513
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Prefix: 'tmp513'
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Datasheet: http://www.ti.com/lit/ds/symlink/tmp513.pdf
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Authors:
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Eric Tremblay <etremblay@distech-controls.com>
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Description
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-----------
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This driver implements support for Texas Instruments TMP512, and TMP513.
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The TMP512 (dual-channel) and TMP513 (triple-channel) are system monitors
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that include remote sensors, a local temperature sensor, and a high-side current
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shunt monitor. These system monitors have the capability of measuring remote
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temperatures, on-chip temperatures, and system voltage/power/current
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consumption.
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The temperatures are measured in degrees Celsius with a range of
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-40 to + 125 degrees with a resolution of 0.0625 degree C.
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For hysteresis value, only the first channel is writable. Writing to it
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will affect all other values since each channels are sharing the same
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hysteresis value. The hysteresis is in degrees Celsius with a range of
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0 to 127.5 degrees with a resolution of 0.5 degree.
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The driver exports the temperature values via the following sysfs files:
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**temp[1-4]_input**
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**temp[1-4]_crit**
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**temp[1-4]_crit_alarm**
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**temp[1-4]_crit_hyst**
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The driver read the shunt voltage from the chip and convert it to current.
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The readable range depends on the "ti,pga-gain" property (default to 8) and the
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shunt resistor value. The value resolution will be equal to 10uV/Rshunt.
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The driver exports the shunt currents values via the following sysFs files:
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**curr1_input**
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**curr1_lcrit**
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**curr1_lcrit_alarm**
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**curr1_crit**
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**curr1_crit_alarm**
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The bus voltage range is read from the chip with a resolution of 4mV. The chip
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can be configurable in two different range (32V or 16V) using the
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ti,bus-range-microvolt property in the devicetree.
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The driver exports the bus voltage values via the following sysFs files:
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**in0_input**
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**in0_lcrit**
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**in0_lcrit_alarm**
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**in0_crit**
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**in0_crit_alarm**
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The bus power and bus currents range and resolution depends on the calibration
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register value. Those values are calculate by the hardware using those
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formulas:
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Current = (ShuntVoltage * CalibrationRegister) / 4096
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Power = (Current * BusVoltage) / 5000
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The driver exports the bus current and bus power values via the following
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sysFs files:
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**curr2_input**
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**power1_input**
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**power1_crit**
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**power1_crit_alarm**
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The calibration process follow the procedure of the datasheet (without overflow)
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and depend on the shunt resistor value and the pga_gain value.
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