Digital temperature compensation filtering

Abstract

Techniques disclosed herein cope with temperature effects in non-volatile memory systems. A control circuit is configured to sense a current temperature of the memory system and read, verify, program, and erase data in non-volatile memory cells by modifying one or more read/verify/program/erase parameters based on a temperature compensation value. The control circuit is further configured to read, verify, program, and erase data by accessing a historical temperature value stored in the memory system, the historical temperature value comprising a temperature at which a previous read, verify, program or erase occurred and measuring a current temperature value. The control circuit determines the temperature compensation value by applying a smoothing function. The smoothing function determines the temperature compensation value by selecting either the historical temperature value or the current temperature value as the temperature compensation value based on a difference between the historical temperature value and the current temperature relative to a threshold, or calculating the temperature compensation value, different from the current temperature value or the historical temperature value, based a smoothing function which utilizes the current temperature value and the historical temperature value.