SMART Embedded Computing MVME2502, Installation And User Manual

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92 MVME2502 Installation and Use (6806800R96L)
Functional Description
Functional Description
4.17 Reset Structure
The MVME2502 reset will initiate after the power up sequence if the 1.5 V power supply is
GOOD. When the board is at READY state, the reset logic will monitor the reset sources
and implement the necessary reset function.
4.17.1 Reset Sequence
The timing of the reset sequence supports each chip reset requirements with respect to the
power supply.
4.18 Thermal Management
The MVME2502 utilizes two on-board temperature sensors: one for the board and the other
for the CPU temperature sensor. The board temperature sensor is located near the
processor. The CPU temperature sensor is located on the processor.
The MVME2502 thermal management support will interrupt the process only to show the
current board and CPU temperature. This interrupt is routed directly to one of the
processor’s IRQ4.
The table below shows the low and high threshold temperature in order for the interrupt to
be asserted.
4.19 Real-Time Clock Battery
The MVME2502 provides a through hole socket for a CR2325 190mAh lithium battery to
provide backup power for the on-board RTC when primary power is unavailable.
Table 4-7 Thermal Interrupt Threshold
Board Variant
Board Temperature
Limit
Board
Temperature
Limit CPU
Temperature
Limit
Low High Low High
Standard Variant 0°C to +55°C 0°C 70°C 0°C 90°C
Extended Temperature
Variant
-40°C to +71°C -40°C 90°C -40°C 100°C