Digilent NetFPGA-SUME Referans Kılavuzu - Sayfa 9

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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).

Other product and company names mentioned may be trademarks of their respective owners.

Rated Current

Overcurrent Warning Limit

40A

15A

N/A

Table 3. Current fault and warning limits

Figure 9. ALERTB interrupt source.

Overcurrent Fault Limit

44A

15.5A

8.5A

3.1992A

15.5A

1.0996A

N/A

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