| Kernel driver lm95234 |
| ===================== |
| |
| Supported chips: |
| |
| * National Semiconductor / Texas Instruments LM95233 |
| |
| Addresses scanned: I2C 0x18, 0x2a, 0x2b |
| |
| Datasheet: Publicly available at the Texas Instruments website |
| |
| http://www.ti.com/product/lm95233 |
| |
| * 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 |
| ----------- |
| |
| LM95233 and LM95234 are 11-bit digital temperature sensors with a 2-wire |
| System Management Bus (SMBus) interface and TrueTherm technology |
| that can very accurately monitor the temperature of two (LM95233) |
| or four (LM95234) remote diodes as well as its own temperature. |
| The remote diodes can be external devices such as microprocessors, |
| graphics processors or diode-connected 2N3904s. The chip'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. |
