| 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 <afd@ti.com> |
| |
| 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). |
| ======================= ======================================================= |
