1、MIL-C-70943 12 m 9999906 0455637 3 m 1GiGG-l MIL-C-70943 (AR) 30 July 1990 MILITARY SPECIFICATION CIRCUIT CARD ASSEMBLY, MICROPROCESSOR: 12922117 This specification is approved for use within the U.S. Army Armament, Munitions and Chemical Command and is available for use by all Departments and Agenc
2、ies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification established the requirements for manufacture and acceptance of the Microprocessor circuit card n ;t- assembly, used in the M90 Radar Chronograph (see 6.1). 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications,
3、 standards and handbooks. The following ,G! specifications, standards and handbooks form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and
4、Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). a Y SPECIFICATIONS MILITARY MIL-F-13926 - Fire Control Materiel, Manufacture and Inspection, General Specification for MIL-P-14232 - Parts, Equipment and Tools for Army Materiel MIL-C-24308 - Connectors, Electric, Rectan
5、gular, Miniature Polarized Shell, Rack and Panel, General Specification for MIL-1-45607 - Inspection Equipment, Acquisition, Maintenance and Disposition of Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document, should be add
6、ressed to: Commander, U.S. Army ARDEC, ATTN: SMCAR-BAC-S, Picatinny Arsenal, New Jersey 07806-5000 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 1290 DI S TRIBUT I ON STATEMENT A. Approved for
7、 public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70743 12 = 777770b 0455b3 5 m MIL-C-70943 (AR) STANDARDS MILITARY MIL-STD-105 - Sampling Procedures and Tables for Inspection by Attributes MIL-STD-109
8、- Quality Assurance Terms and Definitions MIL-STD-454 - Standard General Requirements for Electronic Equipment MIL-STD-2164 - Environmental stress screwing process for electronic equipment. (Unless otherwise indicated, copies of federal and military specifications, standards and handbooks are availa
9、ble from: Standardization Documents Order Desk, Bldg. 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) v 2.1.2 Other Government documents, drawinqs and publications. The following other Government documents, drawings and publications rt form a part of this specification to the extent specified
10、herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. DRAWINGS (See 6.4) U.S. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (ARDEC) . 12922101 - Microprocessor, Schematic Diagram. 12922105 - EM1 Test Procedure 12922117 - Circuit Card As
11、sembly, Microprocessor. 12922145 - M90 Software 12922225 - Environmental Test Methods SPECIAL PACKAGING INSTRUCTIONS P12922117 - Special Packaging Instructions for the Circuit Card Assembly, Microprocessor. (Copies of drawings, publications, and other Government documents required by the contractors
12、 in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) the text of this specification and the references cited herein, the text of this specification shall take Precedence. Nothing in this specification, howeve
13、r, shall supersede applicable laws and regulations unless a specific exemption has been obtained. 2.2 Order of precedence. In the event of a conflict between 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70943 (AR) 3. REQUIREMENTS 3.1 Gener
14、al description. The Microprocessor circuit card assembly (CCA) of M90 Radar Chronograph is located in the data unit. projectile velocity. The CCA processes doppler signal inputs and calculates 3.2 Components and assemblies. The components and assemblies shall comply with all requirements specified o
15、n Drawing 12922117, all associated drawings, and with all requirements specified in applicable specifications and standards. shall meet the requirements of MIL-F-13926 and MIL-STD-454 as follows: Where applicable, the CCA a. Dimensions and tolerances b. Inorganic protective surface finishings c. Par
16、t identification and marking d. Workmanship e. Soldering electrical connections 3.3 Performance requirements. General description. The Microprocessor circuit card assembly is composed of the foltowing 4 basic functional blocks: a. Microprocessor circuitry b. Filter circuitry c. Measuring circuitry d
17、. Voltage Monitor and Switches circuitry The Microprocessor circuitry is centered around the INTEL 8085 microprocessor. Chronograph using Input and Output ports to collect information and .set system mode. the front panel control switches except the power switch, and the microprocessor reads this in
18、formation from the port. Microprocessor reads the Doppler frequency from a programmable counter which counts the filtered doppler signal. muzzle velocity data is sent to the display card via the BCD DATA PORT and the DIGIT SELECT PORT. transmitted and control signals are received, through the remote
19、 control connector. The Microprocessor controls the M90 Radar The Microprocessor polls via input ports, all of The The computed Projectile velocity data is (by the 8251 USART) 3.3.1 CCA loqic. The CCA shall be capable of measuring a Doppler Signal Frequency and convert it to velocity representation.
20、 The CCA shall be capable of driving a display unit with the measurement results: 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70943 (AR) 3.3.1.1 Loqic states: a. STAND-BY - when in STAND BY state the CCA shall be able to recall data. b. R
21、EADY - when in READY state the CCA shall sample input commands and perform measurement. 3.3.1.2 Measurement alqorithm: a. The CCA shall be manually set to the READY state. b. The CCA shall use a trigger mechanism in order to detect the presence of a Doppler signal at the CCA input. The moment of arr
22、ival shall be defined as TO. c. Starting at TO the CCA shall count N input signal cycles. 4 values for N shall be manually controlled by setting CALIBER. Concurrently, the CCA shall measure the elapsed time T required to count the N cycles. d. After completing the count of N cycles, the CCA shall pe
23、rform 7 measurements of the elapsed time, Tl-T7, required to count 256 input signal cycles. The time delay between each measurement shall be T/4. e. The CCA shall used the least square method to develop FO, the input signal frequency at TO. f. The CCA shall translate FO Doppler frequency to velocity
24、 using the following formula: VO = ,014242 x FO m/sl g. The CCA shall update the Display Driver with the calculated VO. h. The CCA shall enter the STAND BY state. 3.3.2 Connector. The CCA shall physically interface to the M90 Radar Chronograph via a D-type, 78 pin connector, type M24308/4-15 in acco
25、rdance with MIL-C-24308. The connector is designated as P5. Pin reference designation shall be in accordance with TABLE I - Microprocessor circuit Card Assembly - Connector Contacts. 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-M MIL-C-70743 12
26、7779706 0455b41 5 M MIL-C-70943 (AR) TABLE I. Connector P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 Microprocessor circuit card assembly connector contacts Pin Sisnal Name 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 2
27、3 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 SPARE DISP 2 /DIGIT SEL 4 V RANGE 03 V RANGE O1 DISP SW O1 DISP SW 02 /DIGIT SEL 5 SPARE CALIBER O0 /B EN 256 CNTR /BUFF REF DOPP /DIGIT SEL 1 /DIGIT SEL 3 SPARE SER DATA IN DTR SER DATA OUT SPARE t5v +5v GND GND GND -12v -5v REF DOPP DOPPLER IN (-) SQ
28、DOPP /STANDBY DOPP SIG FILT DOPP SPARE DISP 1 BLANK DIGIT V RANGE 02 DISP 4 /PBF NO 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- MIL-C-70743 12 = 7777906 OLt55b42 7 MIL-C-70943 (AR) Connector - Pin Sicrnal Name P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5
29、P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 P5 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 58 DISP SW O0 V RANGE O0 DISP SW 03 SPARE CALIBER 01 T-T/4 CNTR OUT 3.6M CTR CLK DISP 8 CTS DSR
30、/DIGIT SEL 2 DIGT SEG G /DIGIT SEL O RT S SER SIG GND DATA SET RDY SPARE t5v t5v +12v GND GND -12v -5v /TRIG /CPU RESET /PBF NC L3.6M CNTR OUT DOPPLER IN (t) t24V INPUT PWR MON READY LOW PASS OUT RELAY POWER SPARE SPARE t12v t12v GND GND -12v 3.3.3. Display driver. The CCA shall be capable of drivin
31、g a display unit with 4 digits and one digit to the nearest tenth (.l). The CCA shall drive a hexadecimal display element to display a positive error indication or the number of measurement rounds in the average displaying mode. The CCA shall drive a display unit with the following requirements: c b
32、 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70743 12 W 7799906 0455643 7 W _ - - MIL-C-70943 (AR) a. Number of Display Elements (DE): 6. b. Data: 4 bit binary coded, Common to all Display Elements. c. Each Display Element shall be separate
33、ly latched with the data to be displayed. The hexadecimal Display Element shall have a blanking command input (1 bit). d. P5 pin designation shall be in accordance with TABLE II. TABLE II - Display driver requirements I 13 I DISP 4 I 47 DISP 8 I 52 I DIGIT SEL O I 14 I DIGIT SEL 1 I 50 I DIGIT SEL 2
34、 I 15 I DIGIT SEL 3 BIT 2 OF DATA I POSITIVE I BIT 3 OF DATA (MSB) I POSITIVE I LATCH ENABLE DE #1 I EDGE TRIG. I LATCH ENABLE DE #2 I EDGE TRIG. I LATCH ENABLE DE #3 1 EDGE TRIG. I LATCH ENABLE DE #4 I EDGE TRIG. I 3.3.4 DISP SW. The CCA shall be capable of automatically storing and recalling the d
35、ata for the last eight rounds measured on demand by controlling the DISP SW inputs. It will also calculate the average and the number of rounds used in the average. Averaging shall commence with the determination of data of the second round. The CCA shall have 4 command inputs designated as: o DISP
36、SW 00: PIN 39 OF P5 DISP SW 01: PIN 6 OF P5 DISP SW 02: PIN 7 OF P5 DISP SW 03: PIN 41 OF P5. The CCA shall recall data of the last rounds or the average and number of rounds that the average was calculated for in accordance with TABLE III. 7 Provided by IHSNot for ResaleNo reproduction or networkin
37、g permitted without license from IHS-,-,-MIL-C-70943 12 W 999990b 0455644 O m: MIL-C-70943 (AR) TABLE III - DISP SW inputs O - TTL LOGIC LOW, 1 - TTL LOGIC HIGH 3.3.5 Accuracv. The CCA shall determine the velocity VO with a precision of .25 percent or .5 meters per second (whichever is greater) in t
38、he velocity range of 150 to 1200 meters per second. 3.3.6 Self test. The CCA shall incorporate a self test to check functionally by simulating a Doppler signal at CCA input. The CCA shall simulate a Doppler signal of 64 KHz. In this state the CCA shall ignore a real Doppler input. Self test is resum
39、ed by setting pins 40, 5, 38, 4 of P5 to the TTL logic combination of 1,1,1,1. 3.3.7 Software. Logic operation of the CCA shall be controlled by software as defined by Drawing 12922145 and Associated Documents (software product specification). 3.3.8 V Rancre. The CCA shall have a measurement range o
40、f 150 to 1250 meters per second divided into 10 sub-ranges as follows: Range I I 1 I 2 I 3 I 4 I 5 I 6 I 7 I 8 I 9 I 10 I - Velocity (m/s) 150 - 300 300 - 400 400 - 500 500 - 600 600 - 700 700 - 800 800 - 900 900 - 1000 1000 - 1100 1100 - 1250 - 8 Provided by IHSNot for ResaleNo reproduction or netw
41、orking permitted without license from IHS-,-,-MIL-C-70943 (AR) The CCA shall have 4 command inputs designated as: V Range 00: PIN 40 of P5 V Range 01: PIN 5 of P5 V Range 02: PIN 38 of P5 V Range 03: PIN 4 of P5 Measurement range shall be selected by applying logic levels to V Range input pins of P5
42、 in accordance with TABLE IV. The CCA shall limit the input Bandwidth by using a variable bandpass filter. -3DB frequency limits and insertion loss shall be in accordance with TABLE IV. TABLE IV - Measurement ranqes O - TTL LOGIC LEVEL LOW, 1 - TTL LOGIC LEVEL HIGH 3.3.9 Automatic reset. When power
43、is applied, the CCA shall resume restart procedure and go to STAND-BY state. 3.3.10 Press before fire (PBF). Command input to the CCA to toggle between READY and STANDBY states, designated as PBF NO, Pin 29 of P5 and PBF NC, Pin 65 of P5. Normal conditions are for pin 29 to be at TTL logic level hig
44、h and Pin 65 at TTL Logic level low. When pin 29 goes to logic level low and pin 65 to logic level high, the CCA shall toggle from Ready to Stand By state, and vice-versa. 3.3.11 CPU reset. External reset input to the CCA microprocessor. The reset input shall be in Pin 44 of P5, designated as CPU RE
45、SET. The signal input shall be active low, TTL logic levels. 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-70943 12 W 9949906 0455646 4 i1 MIL-C-70943 (AR) 3.3.12 Indicator lamps. The CCA shall provide means to activate two indicator lamps
46、of 28 volts, 50 mA. Each indicator lamp shall have one pole connected t028V and the other pole connected to the CCA pin 32 of P5 designated as /STANDBY and pin 69 of P5 designated as /READY. /STANDBY indicator shall be activated when the CCA is in STAND BY state. /READY indicator shall be activated
47、when the CCA is in READY State. 3.3.13 Antenna control. The CCA shall drive an on/off control line correlated to READY or STAND-BY states respectively. The CCA shall supply a 12 volt command through a 680 ohm resistor on the command line, Pin 67 of P5. When in READY state, the Return command line, P
48、in 30 of P5 shall be grounded through a 680 ohm resistor to CCA ground. When in STAND BY state, the Return command line shall be isolated from CCA ground. 3.3.14 +24V INPUT PWR MON. The CCA shall have the means of sensing a voltage of 30 V maximum and detect a level of under 16.4 +/- .5 V. The input
49、 voltage shall be applied to the CCA on pin 68 of P5, designated as +24V INPUT PWR MON. When the +24V INPUT PWR MON voltage goes under 16.4 +/- .5 V, Indicator Lamps and Antenna Control shall be disabled. 3.3.15 Caliber. The CCA shall accept manual control of the value N used in the measurement algorithm to be one of the following: N1 =
