Digest Check Inducted VDD Surge Current

The digest check system service performs on-chip NVM data integrity check on SmartFusion2 devices. The use of system services by digest check may cause additional surge current on VDD. For more information on digest check service, see the UG0450: SmartFusion2 SoC and IGLOO2 FPGA System Controller User Guide.

The following table provides surge current data recorded for VDD when system services were being used by the digest check service. To limit surge current during digest check, follow the Microchip recommended board design guidelines.

Table 1. Surge Current on VDD During Digest Check Using System Services (No Decoupling Capacitors on Board)
Device	Width of Surge at 50% of Pulse (μS)	Surge Current on VDD			Units
Device	Width of Surge at 50% of Pulse (μS)	0 °C to 85 °C	–40 °C to 100 °C	–55 °C to 125 °C Units	Units
M2S005/M2GL005	12	0.2	0.2	0.2	A
M2S010/M2GL010	12	0.5	0.5	0.5	A
M2S025/M2GL025	13	0.6	0.6	0.6	A
M2S050/M2GL050	13	0.9	0.9	0.9	A
M2S060/M2GL060	13	0.9	0.9	0.9	A
M2S090/M2GL090	20	1.0	1.0	1.0	A
M2S150/M2GL150	26	1.0	1.0	1.0	A