The application of magnetic random access memory in remote sensing camera

At present, there is an urgent requirement for the reliability and the radiation resistivity in remote sensing camera. The existing memories are mainly conventional semiconductor devices, which are easily affected by radiation and destroyed by radiation in aerospace. In this paper, we recommend an application of MRAM (Magnetic Random Access Memory) in remote sensing camera. The design improves the reliability of the remote sensing camera in hardware and software. In hardware, Magnetic Tunnel Junction (MTJ), the basic element for MRAM, is immune to Single Event Upset (SEU). Meanwhile using Latch-up Current Limiter (LCL) connects the supply and MRAM to monitor the current, which can avoid the current too large. In software, Field Programmable Gate Array (FPGA) detects the status of LCL. Once the times of overcurrent are more than five times, LCL would be turned off permanently by FPGA. As thus it is effective to protect the devices from being damaged. The paper presents the architecture of the control system of MRAMs, and implements it.