8.3.9 TCRIT Limits and TCRIT Outputs

Figure 16 describes a simplified diagram of the temperature comparison and status register logic. Figure 17, Figure 18, and Figure 19 describe simplified logic diagrams of the circuitry associated with the status registers, mask registers, and the TCRIT output pins.

Figure 16. Temperature Comparison Logic and Status Register Simplified Diagram

Figure 17. TCRIT1 Mask Register, Status Register 1 and 2, and TCRIT1 Output Logic Diagram

Figure 19. TCRIT3 Mask Register, Status Register 1 and 4, and TCRIT3 Output Logic Diagram

Figure 18. TCRIT2 Mask Register, Status Register 1 and 3, and TCRIT2 Output Logic Diagram

If enabled, local temperature is compared to the user programmable Local Tcrit 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 16). 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 17, Figure 18, and Figure 19). The comparison result can also be read back from the Status Register 2, Status Register 3 and Status Register 4.

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 16). 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 17, Figure 18, and Figure 19). 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).

Figure 20. TCRIT Response Diagram (Masking Options Not Included)

The TCRIT response diagram of Figure 20 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.