| Kernel driver lm95245 | |
| ================== | |
| Supported chips: | |
| * TI LM95235 | |
| Addresses scanned: I2C 0x18, 0x29, 0x4c | |
| Datasheet: Publicly available at the TI website | |
| http://www.ti.com/lit/ds/symlink/lm95235.pdf | |
| * TI / National Semiconductor LM95245 | |
| Addresses scanned: I2C 0x18, 0x19, 0x29, 0x4c, 0x4d | |
| Datasheet: Publicly available at the TI website | |
| http://www.ti.com/lit/ds/symlink/lm95245.pdf | |
| Author: Alexander Stein <alexander.stein@systec-electronic.com> | |
| Description | |
| ----------- | |
| LM95235 and LM95245 are 11-bit digital temperature sensors with a 2-wire System | |
| Management Bus (SMBus) interface and TruTherm technology that can monitor | |
| the temperature of a remote diode as well as its own temperature. | |
| The chips can be used to very accurately monitor the temperature of | |
| external devices such as microprocessors. | |
| All temperature values are given in millidegrees Celsius. Local temperature | |
| is given within a range of -127 to +127.875 degrees. Remote temperatures are | |
| given within a range of -127 to +255 degrees. Resolution depends on | |
| temperature input and range. | |
| Each sensor has its own critical limit. Additionally, there is a relative | |
| hysteresis value common to both critical limits. To make life easier to | |
| user-space applications, two absolute values are exported, one for each | |
| channel, but these values are of course linked. Only the local hysteresis | |
| can be set from user-space, and the same delta applies to the remote | |
| hysteresis. | |
| The lm95245 driver can change its update interval to a fixed set of values. | |
| It will round up to the next selectable interval. See the datasheet for exact | |
| values. Reading sensor values more often will do no harm, but will return | |
| 'old' values. |