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BEU8637-08-S Datasheet(PDF) 5 Page - Aeroflex Circuit Technology |
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BEU8637-08-S Datasheet(HTML) 5 Page - Aeroflex Circuit Technology |
5 / 9 page SCD8637-08 Rev A 3/21/08 Aeroflex Plainview 5 32-Word Telemetry To reduce data bus bandwidth usage, the 8637-08 supports a 32-word telemetry request on sub-address 20 as defined in Table III. First a 1553B receive command with one data word of AAAA(Hex) must be issued. After a minimum delay of 1.2ms, the data can be retrieved by sending a 1553B transmit command for 32 data words on sub-address 20. Reply word 31 is a modulo-16 message count. This counter increments by one for each valid telemetry request. The 12-bit analog data reply is left justified in the 16-bit 1553B data word with the four LSBs set to "0".. 8-Word Telemetry To reduce data bus bandwidth usage, the 8637-08 supports an 8-word telemetry request on sub-address 24 as defined in Table IV. First a 1553B receive command with one data word of 5555(Hex) must be issued. After a minimum delay of 1.2ms, the data can be retrieved by sending a 1553B transmit command for 8 data words on sub-address 24. Reply word 8 is a modulo-16 message count. This counter increments by one for each valid telemetry request. The 12-bit analog data reply is left justified in the 16-bit 1553B data word with the four LSBs set to "0". Table III – 32-Word Telemetry Item Telemetry Title Telemetry Type Reply Word Reply Bits 1 4V Reference Analog 1 D(15:4) 2 Total Battery Voltage 1 Analog 2 D(15:4) 3 Total Battery Voltage 2 Analog 3 D(15:4) 4 Total Battery Voltage 3 Analog 4 D(15:4) 5 Share Bus Voltage Analog 5 D(15:4) 6 Reserved - 6 D(15:4) 7 Cell 1 Voltage Analog 7 D(15:4) 8 Cell 2 Voltage Analog 8 D(15:4) 9 Cell 3 Voltage Analog 9 D(15:4) 10 Cell 4 Voltage Analog 10 D(15:4) 11 Cell 5 Voltage Analog 11 D(15:4) 12 Cell 6 Voltage Analog 12 D(15:4) 13 Cell 7 Voltage Analog 13 D(15:4) 14 Cell 8 Voltage Analog 14 D(15:4) 15 Reserved - 15 D(15:4) 16 Reserved - 16 D(15:4) 17 Reserved - 17 D(15:4) 18 Reserved - 18 D(15:4) 19 Cell 13 Voltage Analog 19 D(15:4) 20 Cell 14 Voltage Analog 20 D(15:4) 21 Cell 15 Voltage Analog 21 D(15:4) 22 Cell 16 Voltage Analog 22 D(15:4) 23 Cell 17 Voltage Analog 23 D(15:4) 24 Cell 18 Voltage Analog 24 D(15:4) 25 Cell 19 Voltage Analog 25 D(15:4) 26 Cell 20 Voltage Analog 26 D(15:4) 27 Reserved - 27 D(15:4) 28 Reserved - 28 D(15:4) 29 Reserved - 29 D(15:4) 30 Reserved - 30 D(15:4) 31 Message Count Analog 31 D(15:0) 32 Overvoltage Latch Status Bi-level 32 D13 1/ For Battery A. 2/ For Battery B. ⎭ ⎫ ⎬1/ ⎭ ⎫ ⎬2/ Table IV – 8-Word Telemetry Item Telemetry Title Telemetry Type Reply Word Reply Bits 1 Overvoltage Latch Status Bi-level 1 D13 2Reserved - 2 D15 3Reserved - 3 D15 4Reserved - 4 D15 50V Reference Analog 5 D(15:4) 6 Lowest Cell Voltage Analog 6 D(15:4) 7 Highest Cell Voltage Analog 7 D(15:4) 8 Message Count Analog 8 D(15:0) |
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