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The monitor command temp chip displays all information about the temperature sensor chip located on the head controller board. This sensor has its own internal temperature sensing diode as well as the ability to read up to three external diodes. One of the external sensors is a diode located inside the head controller FPGA chip and serves to monitor its temperature. The remaining two external sensing diodes are unconnected.
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| The temperature sensor chip has provision to activate two separate interrupt sources. There is both a 'high temperature' alarm and a 'critical' alarm. The critical alarm is considered redundant for firmware purposes and only the high temperature alarm will generate an interrupt. Below is an example of a typical output from the monitor command temp chip:
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| High High Crit Crit
Sensor Temp Trig Flag Flag Ints Connected
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Ambient 43 C 100 C 0 0 No Yes
FPGA 69 C 100 C 0 0 No Yes
D2 127 C 127 C 0 0 No No
D3 127 C 127 C 0 0 No No
Critical Trigger = 127
High temp interrupt Disabled
High temp interrupt pin active Low |
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| In this example, the temperature sensor chip ( located on the top side of the head controller board and well away from larger heat generating components ) shows an internal or 'ambient' temperature of 36 C. The large energy consuming FPGA chip reads a much higher value of 52 C. The other remote diodes, D2 and D3, are unconnected and therefore both read a default value of 127 C. Because these sensor inputs have a 'trigger' value of 127 C they will not generate a high temperature interrupt. The 'High Trig' values for the Ambient and FPGA sensors are both set to 100 C. If the temperature goes above 100 C on either of these sensors an interrupt will be triggered that initiates a shutdown of the exposure head.
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| The 'High Flag' and 'Crit Flag' columns show that no high temperature or critical temperature alarms currently exist and the 'Crit Ints' column indicates that critical interrupts are disabled. Below the table are three more lines of self explanatory information.
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Thermal 1.0 / 1.7x equivalents:
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- The monitor command temp chip does not have an equivalent.
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| Thermal 2 equivalents:
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- The monitor command temp chip does not have an equivalent.
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