Description¶

LM95235 and LM95245 are 11-bit digital temperature sensors with a 2-wire SystemManagement Bus (SMBus) interface and TruTherm technology that can monitorthe temperature of a remote diode as well as its own temperature.The chips can be used to very accurately monitor the temperature ofexternal devices such as microprocessors.

All temperature values are given in millidegrees Celsius. Local temperatureis given within a range of -127 to +127.875 degrees. Remote temperatures aregiven within a range of -127 to +255 degrees. Resolution depends ontemperature input and range.

Each sensor has its own critical limit. Additionally, there is a relativehysteresis value common to both critical limits. To make life easier touser-space applications, two absolute values are exported, one for eachchannel, but these values are of course linked. Only the local hysteresiscan be set from user-space, and the same delta applies to the remotehysteresis.

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 exactvalues. Reading sensor values more often will do no harm, but will return‘old’ values.