Microsemi LX7730耐辐射遥测系统控制器解决方案
Microsemi公司的LX7730是耐辐射遥测系统控制器，作为FPGA的姐妹器件，包括了64个通用输入复接器，可以配置差分或单端传感器输入端，集成了13kSPS 12位ADC和10位DAC，可调电流源精度3%，1%精度的5.00V电压源，具有阈值监测，支持并行或两个SPI接口，耐辐射容差为100krad TID，50kad ELDRS，主要用在数字通信，有效载荷设备遥控，遥测系统跟踪和控制，透明射频应答器，航天器健康监测和姿态控制系统。本文介绍了LX7730主要特性，框图，传感器扩展器框图，典型应用电路图以及LX7730 MKT评估板主要特性和电路图。
The LX7730 is a spacecraft telemetry manager IC that functions as a companion to the FPGA. The LX7730 contains a 64 universal input multiplexer that can be configured as a mix of differential or single ended sensor inputs. There is a programmable current source that can be directed to any of the 64 universal inputs. The universal inputs can be sampled with a 12 bit analog-to-digital converter at a sample rate up to 13kHz. The universal inputs can also function as variable bi-level inputs with the threshold set by an internal 8 bit digital-to-analog converter. There is an additional 10 bit digital-to- analog current DAC with complementary outputs. Finally there are 8 fixed threshold bi-level inputs.
The LX7730 is register programmable with 17 addressable eight bit registers. Two options are available for communication with the host FPGA. First there is an eight bit parallel bus with 5 address bits and a read/write bit that can communicate at a speed of up to 25MHz. The second option is a pair of 12.5Mbps SPI interfaces that can support redundant （alternating not simultaneous） communication to two different hosts.
The LX7730 offers 1 kV ESD pin protection on FPGA interface pins and 500V ESD protection to all CH# and BLI# pins. The dielectric isolated process is failsafe. The LX7730 has enable registers that allow most of the device to be shut down to reduce power consumption and supports cold sparing on its signal pins.
The controller is designed for use in rugged environments. It is packaged in a 132 pin ceramic quad flat pack and operates over a -55℃ to 125℃ temperature range. It is radiation tolerant to 100krad TID and 50krad ELDRs as well as single event effects.
LX7730主要特性：
64 channel MUX
Break-before-make switching
13kSPS 12 bit ADC
3% Precision Adjustable Current Source
1% Precision 5.00V Source
Threshold Monitoring
8 x Bi-level Logic
10 bit DAC
Supports Parallel or Dual SPI Interface
Radiation Tolerant： 100krad TID， 50kad ELDRS
LX7730应用：
Spacecraft Health Monitoring
Attitude Control
Payload Equipment
图1. LX7730应用框图
图2.LX7730顶级框图
图3.LX7730传感器扩展器框图
图4.LX7730典型应用电路图
LX7730 MKT评估板
The LX7730 Evaluation board is basically a ‘breakout box’ that allows the user when it’s coupled with the included USB to serial interface and application software to exercise the controller’s features. The included USB to serial interface is the Future Technologies Device International （FTDI） C232HM-DDHSL-0 cable assembly. USB device drivers must be loaded on host computer along with the LX7730 application software to utilize the LX7730 evaluation board as shipped.
图5.LX7730 MKT评估板外形图
图6.传感器复接器框图
图7.LX7730 MKT评估板电路图
The LX7730 daughter board is designed to allow the user to exercise the controller’s feature throughRTG4 evaluation board and the provided application interface. The included granddaughter board isused to provide LX7730 input sensor data.
图8.LX7730子板和孙子板外形图
图9.LX7730子板和孙子板连接建立图
图10.RTG4板连接器建立图
图11.LX7730插座连接器电路
图12.FMC连接器LPC电路图
图13.降压升压稳压器电路图
图14.子板电路图
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