Electrical characteristics, Lm92 – Rainbow Electronics LM92 User Manual

Page 7

Electrical Characteristics

(Continued)

Note 11: Linearity Error is defined as the worse case difference of an actual reading to that of a calculated reading derived from the straight line whose endpoints
are measured at 30˚C and 125˚C for the range of 30˚C to 125˚C or whose endpoints are measured at 30˚C and −25˚C for the range of 30˚C to −25˚.

Note 12: Offset Error calibration should be done at 30˚C. The residual error of the transfer function is then equivalent to the Accuracy Limit minus the Offset Limit.
This does not take into account the power supply sensitivity of the offset error. Nor, does it take into account the error introduced by the calibration system used.

Note 13: This specification is provided only to indicate how often temperature data is updated. The LM92 can be read at any time without regard to conversion state
(and will yield last conversion result). If a conversion is in process it will be interrupted and restarted after the end of the read.

Note 14: For best accuracy, minimize output loading. 10k pull-ups resistors should be sufficient. Higher sink currents can affect sensor accuracy with internal heat-
ing. This can cause an error of 0.64 ˚C at full rated sink current and saturation voltage based on junction-to-ambient thermal resistance.

Note 15: Hysteresis value adds to the T

LOW

setpoint value (e.g.: if T

LOW

setpoint = 10 ˚C, and hysteresis = 2 ˚C, then actual hysteresis point is 10+2 = 12 ˚C); and

subtracts from the T

HIGH

and T_CRIT setpoints (e.g.: if T

HIGH

setpoint = 64 ˚C, and hysteresis = 2 ˚C, then actual hysteresis point is 64−2 = 62 ˚C). For a detailed

discussion of the function of hysteresis refer to

Section 1.1, TEMPERATURE COMPARISON, and Figure 3.

Note 16: Default values set at power up.

Note 17: Holding the SDA and/or SCL lines Low for a time interval greater than t

TIMEOUT

will cause the LM92 to reset SCL and SDA to the IDLE state of the serial

bus communication (SDA and SCL set High).

DS101051-5

FIGURE 2. Temperature-to-Digital Transfer Function (Non-linear scale for clarity)

LM92