Microsemi LX7730耐輻射遙測系統控制器解決方案

Microsemi公司的LX7730是耐輻射遙測系統控制器，作為FPGA的姐妹器件，包括了64個通用輸入復接器，可以配置差分或單端傳感器輸入端，集成了13kSPS 12位ADC和10位DAC，可調電流源精度3%，1%精度的5.00V電壓源，具有閾值監測，支持并行或兩個SPI接口，耐輻射容差為100krad TID，50kad ELDRS，主要用在數字通信，有效載荷設備遙控，遙測系統跟蹤和控制，透明射頻應答器，航天器健康監測和姿態控制系統。本文介紹了LX7730主要特性，框圖，傳感器擴展器框圖，典型應用電路圖以及LX7730 MKT評估板主要特性和電路圖。

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應用：

Spacecraft Health Monitoring

Attitude Control

Payload Equipment

圖1. LX7730應用框圖

圖2.LX7730頂級框圖

圖3.LX7730傳感器擴展器框圖

圖4.LX7730典型應用電路圖

LX7730 MKT評估板

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.

圖5.LX7730 MKT評估板外形圖

圖6.傳感器復接器框圖

圖7.LX7730 MKT評估板電路圖

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.

圖8.LX7730子板和孫子板外形圖

圖9.LX7730子板和孫子板連接建立圖

圖10.RTG4板連接器建立圖

圖11.LX7730插座連接器電路

圖12.FMC連接器LPC電路圖

圖13.降壓升壓穩壓器電路圖

圖14.子板電路圖