Digilent NetFPGA-SUME Manual de referencia - Página 9

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Digilent NetFPGA-SUME Manual de referencia
NetFPGA-SUME™ Reference Manual
Note: the DDRVTT and QDRVTT rails are not directly monitored by the LTC2974s.
Supply Rail
Undercurrent Fault Limit
VCC1V0
-1A
VCC1V8
-2A
VCC2V0
-1A
MGTAVCC
-1A
MGTAVTT
-1A
VCC3V3
-1A
VCC1V5
-1A
MGTVAUX
-1A
DDRVTT
N/A
QDRVTT
N/A
Note: the DDRVTT and QDRVTT rails are not directly monitored by the LTC2974s.
2.4
Fault and Warning Interrupt Sources
When the LTC2974 detects a fault or a warning condition it may signal an interrupt by driving the ALERTB,
AUXFAULTB, or FAULTB1 pins.
The ALERTB pin of the LTC2974 is an open drain output that is driven low whenever a fault or warning occurs. The
ALERTB pins of the two LTC2974s (IC43 and IC44) are connected in a wire-and fashion via the PCON_ALERT_B net
to pin J41 of the FPGA (IC12), as shown in Fig. 9. Enabling the internal pull-up on pin J41 will allow the FPGA
application to use this pin as an interrupt when any of the following situations occur:
Output overvoltage or under voltage fault/warning
Output over current or under current fault/warning
Over temperature fault/warning
Channel output voltage has not reached or exceeded the under voltage fault limit set for that channel
within TON_MAX_FAULT_LIMIT milliseconds (set to 15ms) of the output being enabled
When any of the above faults occur, the PCON_ALERT_B net will be driven low until the fault condition has been
removed and the CLEAR_FAULTS command has been sent to both of the LTC2974s (IC43 and IC44).
Copyright Digilent, Inc. All rights reserved.
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Rated Current
Overcurrent Warning Limit
40A
40A
15A
15A
2A
2A
8A
8A
3A
3A
15A
15A
15A
15A
1A
1A
3A
N/A
3A
N/A
Table 3. Current fault and warning limits
Figure 9. ALERTB interrupt source.
Overcurrent Fault Limit
44A
15.5A
3A
8.5A
3.1992A
15.5A
15.5A
1.0996A
N/A
N/A
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