Flash Memory; Low Voltage And Rfi Settings - Decatur Electronics SI-2 Technical Manual

Flash Memory

U3, a 1M-bit flash memory chip, holds the software that the DSP chip executes. At power up, the DSP chip
boot loads the software in U3 into internal high-speed program memory where program execution takes place.
U3 also stores the operational parameters for the radar unit.

Low Voltage and RFI Settings

Low voltage on the SI-2 requires no adjustments and is permanently set to trip around 5.5VDC. The RFI trip
level is permanently set to trip at normally offending levels and requires no adjustments.
Serial Communication
U16, a MAX232 or equivalent interface chip, with capacitors C55, C56, C58, and C59 generate the proper
voltage levels for RS232 transmit and receive signaling. C57 provides bypassing of the digital supply.
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