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