| Kernel driver lm95234 | |
| ===================== | |
| Supported chips: | |
| * National Semiconductor / Texas Instruments LM95234 | |
| Addresses scanned: I2C 0x18, 0x4d, 0x4e | |
| Datasheet: Publicly available at the Texas Instruments website | |
| http://www.ti.com/product/lm95234 | |
| Author: Guenter Roeck <linux@roeck-us.net> | |
| Description | |
| ----------- | |
| LM95234 is an 11-bit digital temperature sensor with a 2-wire System Management | |
| Bus (SMBus) interface and TrueTherm technology that can very accurately monitor | |
| the temperature of four remote diodes as well as its own temperature. | |
| The four remote diodes can be external devices such as microprocessors, | |
| graphics processors or diode-connected 2N3904s. The LM95234's TruTherm | |
| beta compensation technology allows sensing of 90 nm or 65 nm process | |
| thermal diodes accurately. | |
| All temperature values are given in millidegrees Celsius. Temperature | |
| is provided within a range of -127 to +255 degrees (+127.875 degrees for | |
| the internal sensor). Resolution depends on temperature input and range. | |
| Each sensor has its own maximum limit, but the hysteresis is common to all | |
| channels. The hysteresis is configurable with the tem1_max_hyst attribute and | |
| affects the hysteresis on all channels. The first two external sensors also | |
| have a critical limit. | |
| The lm95234 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. |