TC1796
System Units (Vol. 1 of 2)
System Control Unit
User’s Manual 5-43 V2.0, 2007-07
SCU, V2.0
The switching thresholds are evaluated hierarchically (see Table 5-6). For proper
operation the relationship THMIN > THMED > THMAX must be true. With increasing
temperature, the compensation value SCU_TCLRx.THCOUNT decreases.
Note: The reset value FF
H
for the thresholds ensures that the drivers operate on
maximum level if the threshold values have not been initialized.
Note: Reprogramming of the threshold levels in registers SCU_TCLR0 and
SCU_TCLR1 should only be executed while the temperature compensation is
disabled.
Figure 5-9 Temperature Compensation Switching Thresholds
Table 5-6 Switching Threshold Hierarchy
Output Driver Control Relationship between
THCOUNT and THMAX, THMED, THMIN
Maximum Level THCOUNT < THMAX
High Level THMED ≥ THCOUNT > THMAX
Low Level THMIN ≥ THCOUNT > THMED
Minimum Level THCOUNT > THMIN
MCD05620
Thresholds
Temp.
High
Max
Low
Min
Driver
Level
125 °C80 °C40 °C0 °C-40 °C
Count
= function of Temp.
TCV = 00
B
TCV = 01
B
TCV = 10
B
TCV = 11
B
THCOUNT
THMIN
THMED
THMAX
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