| Felten, Lothar | f7c2fe3 | 2012-05-12 04:36:38 -0400 | [diff] [blame] | 1 | Kernel driver ina2xx |
| 2 | ==================== |
| 3 | |
| 4 | Supported chips: |
| 5 | * Texas Instruments INA219 |
| 6 | Prefix: 'ina219' |
| 7 | Addresses: I2C 0x40 - 0x4f |
| 8 | Datasheet: Publicly available at the Texas Instruments website |
| 9 | http://www.ti.com/ |
| 10 | |
| Guenter Roeck | dc92cd0 | 2012-05-12 11:33:11 -0700 | [diff] [blame] | 11 | * Texas Instruments INA220 |
| 12 | Prefix: 'ina220' |
| 13 | Addresses: I2C 0x40 - 0x4f |
| 14 | Datasheet: Publicly available at the Texas Instruments website |
| 15 | http://www.ti.com/ |
| 16 | |
| Felten, Lothar | f7c2fe3 | 2012-05-12 04:36:38 -0400 | [diff] [blame] | 17 | * Texas Instruments INA226 |
| 18 | Prefix: 'ina226' |
| 19 | Addresses: I2C 0x40 - 0x4f |
| 20 | Datasheet: Publicly available at the Texas Instruments website |
| 21 | http://www.ti.com/ |
| 22 | |
| Guenter Roeck | dc92cd0 | 2012-05-12 11:33:11 -0700 | [diff] [blame] | 23 | * Texas Instruments INA230 |
| 24 | Prefix: 'ina230' |
| 25 | Addresses: I2C 0x40 - 0x4f |
| 26 | Datasheet: Publicly available at the Texas Instruments website |
| 27 | http://www.ti.com/ |
| 28 | |
| Felten, Lothar | f7c2fe3 | 2012-05-12 04:36:38 -0400 | [diff] [blame] | 29 | Author: Lothar Felten <l-felten@ti.com> |
| 30 | |
| 31 | Description |
| 32 | ----------- |
| 33 | |
| 34 | The INA219 is a high-side current shunt and power monitor with an I2C |
| 35 | interface. The INA219 monitors both shunt drop and supply voltage, with |
| 36 | programmable conversion times and filtering. |
| 37 | |
| Guenter Roeck | dc92cd0 | 2012-05-12 11:33:11 -0700 | [diff] [blame] | 38 | The INA220 is a high or low side current shunt and power monitor with an I2C |
| 39 | interface. The INA220 monitors both shunt drop and supply voltage. |
| 40 | |
| Felten, Lothar | f7c2fe3 | 2012-05-12 04:36:38 -0400 | [diff] [blame] | 41 | The INA226 is a current shunt and power monitor with an I2C interface. |
| 42 | The INA226 monitors both a shunt voltage drop and bus supply voltage. |
| 43 | |
| Guenter Roeck | dc92cd0 | 2012-05-12 11:33:11 -0700 | [diff] [blame] | 44 | The INA230 is a high or low side current shunt and power monitor with an I2C |
| 45 | interface. The INA230 monitors both a shunt voltage drop and bus supply voltage. |
| 46 | |
| Bartosz Golaszewski | 8a5fc79 | 2015-01-05 15:20:55 +0100 | [diff] [blame] | 47 | The shunt value in micro-ohms can be set via platform data or device tree at |
| 48 | compile-time or via the shunt_resistor attribute in sysfs at run-time. Please |
| 49 | refer to the Documentation/devicetree/bindings/i2c/ina2xx.txt for bindings |
| Tang Yuantian | 31e7ad7 | 2013-06-19 14:50:20 +0800 | [diff] [blame] | 50 | if the device tree is used. |
| Bartosz Golaszewski | 72a87a4 | 2015-01-09 17:03:42 +0100 | [diff] [blame^] | 51 | |
| 52 | Additionally ina226 supports update_interval attribute as described in |
| 53 | Documentation/hwmon/sysfs-interface. Internally the interval is the sum of |
| 54 | bus and shunt voltage conversion times multiplied by the averaging rate. We |
| 55 | don't touch the conversion times and only modify the number of averages. The |
| 56 | lower limit of the update_interval is 2 ms, the upper limit is 2253 ms. |
| 57 | The actual programmed interval may vary from the desired value. |