Datasheet

T_CRITn
Output Pin
Local Tcrit Limit
Local
Temperature
Status bit LTn
Local Tcrit Limit -
Common Hysteresis
Common
Hysteresis
LM95214
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SNIS146A MARCH 2007REVISED MARCH 2013
If enabled, remote temperature 1 is compared to the user programmable Remote 1 Tcrit-1 Limit Register (Default
Value 110°C) and Remote 1 Tcrit-2 Limit Register (Default Value = 85°C). The result of this comparison is stored
in Status Register 2, Status Register 3 and Status Register 4 (see Figure 12). The comparison result can trigger
TCRIT1 pin, TCRIT2 pin or TCRIT3 pin depending on the settings in the TCRIT1 Mask, TCRIT2 Mask and
TCRIT3 Mask Registers (see Figure 13, Figure 14, and Figure 15). The comparison result can also be read back
from the Status Register 2, Status Register 3 and Status Register 4. The remote temperature 2 operates in a
similar manner to remote temperature 1 using its associated user programmable limit registers: Remote 2 Tcrit-1
Limit Register (Default Value 110°C) and Remote 2 Tcrit-2 Limit Register (Default Value = 85°C). When enabled,
the remote temperature 3 is compared to the user programmable Remote 3 Tcrit Limit Register (Default Value
85°C). The comparison result can trigger TCRIT1 pin, TCRIT2 pin or TCRIT3 pin depending on the settings in
the TCRIT1 Mask, TCRIT2 Mask and TCRIT3 Mask Registers. The comparison result can also be read back
from the Status Register 2, Status Register 3 and Status Register 4. The remote temperature 4 operates in a
similar manner to remote temperature 3 using its associated user programmable limit register: Remote 4 Tcrit
Limit Register (Default Value 85°C).
Table 6. Limit assignments for each TCRIT output pin:
TCRIT1 TCRIT2 TCRIT3
Remote 4 Remote 4 Remote 4 Remote 4
Tcrit Limit Tcrit Limit Tcrit Limit
Remote 3 Remote 3 Remote 3 Remote 3
Tcrit Limit Tcrit Limit Tcrit Limit
Remote 2 Remote 2 Remote 2 Remote 2
Tcrit-1 Limit Tcrit-2 Limit Tcrit-2 Limit
Remote 1 Remote 1 Remote 1 Remote 1
Tcrit-1 Limit Tcrit-2 Limit Tcrit-2 Limit
Local Local Local Local
Tcrit Limit Tcrit Limit Tcrit Limit
Figure 16. TCRIT response diagram (masking options not included)
The TCRIT response diagram of Figure 16 shows the local temperature interaction with the Tcrit limit and
hysteresis value. As can be seen in the diagram when the local temperature exceeds the Tcrit limit register value
the LTn Status bit is set and the T_CRITn output(s) is/are activated. The Status bit(s) and outputs are not
deactivated until the temperature goes below the value calculated by subtracting the Common Hysteresis value
programmed from the limit. This diagram mainly shows an example function of the hysteresis and is not meant to
show complete function of the possible settings and options of all the TCRIT outputs and limit values.
DIODE FAULT DETECTION
The LM95214 is equipped with operational circuitry designed to detect fault conditions concerning the remote
diodes. In the event that the D+ pin is detected as shorted to GND, D, V
DD
or D+ is floating, the Remote
Temperature reading is –128.000°C if signed format is selected and 0°C if unsigned format is selected. In
addition, the appropriate status register bits RD1M or RD2M (D1 or D0) are set.
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