BEU8638-12 Datasheet, PDF (5/10 Pages) Aeroflex Circuit Technology – Independent Balancing for Two 12-Cell Batteries Cell Voltage Monitoring and Telemetry Cell Bypass Relay Drivers

32-Word Telemetry
To reduce data bus bandwidth usage, the 8638-12 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 8638-12 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 Reply
Type Word
Reply Bits
1 4V Reference
Analog 1
2 Total Battery Voltage 1
Analog 2
3 Total Battery Voltage 2
Analog 3
4 Total Battery Voltage 3
Analog 4
5 Share Bus Voltage
Analog 5
6 Master Bypass Power Status
Analog 6
7 Cell 1 Voltage
8 Cell 2 Voltage
9 Cell 3 Voltage
10 Cell 4 Voltage
Analog 7
⎫
Analog
Analog
8
9
Analog 10
11 Cell 5 Voltage
12 Cell 6 Voltage
13 Cell 7 Voltage
14 Cell 8 Voltage
Analog 11
⎬ ^1/
Analog
Analog
12
13
Analog 14
15 Cell 9 Voltage
16 Cell 10 Voltage
17 Cell 11 Voltage
18 Cell 12 Voltage
⎭
Analog 15
Analog 16
Analog 17
Analog 18
19 Cell 13 Voltage
20 Cell 14 Voltage
21 Cell 15 Voltage
22 Cell 16 Voltage
Analog 19
⎫
Analog
Analog
20
21
Analog 22
23 Cell 17 Voltage
24 Cell 18 Voltage
25 Cell 19 Voltage
26 Cell 20 Voltage
Analog 23
⎬ ^2/
Analog
Analog
24
25
Analog 26
27 Cell 21 Voltage
28 Cell 22 Voltage
29 Cell 23 Voltage
30 Cell 24 Voltage
⎭
Analog 27
Analog 28
Analog 29
Analog 30
31 Message Count
Analog 31
32 Overvoltage Latch Status
Bi-level 32
1/ For Battery A. 2/ For Battery B.
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:4)
D(15:0)
D13
Table IV – 8-Word Telemetry
Item Telemetry Title
Telemetry Reply
Type
Word
Reply Bits
1 Overvoltage Latch Status
Bi-level
1
2 Bypass Dev. 1 Arm Status
Bi-level
2
3
4
Bypass Dev. 2 Arm Status
Bypass Dev. 3 Arm Status
⎫
Bi-level
Bi-level
2
2
5 Bypass Dev. 4 Arm Status
Bi-level
2
6 Bypass Dev. 5 Arm Status
Bi-level
2
7
8
Bypass Dev. 6 Arm Status
Bypass Dev. 7 Arm Status
⎬ ^1/
Bi-level
Bi-level
2
2
9 Bypass Dev. 8 Arm Status
Bi-level
2
10
11
12
Bypass Dev. 9 Arm Status
Bypass Dev. 10 Arm Status
Bypass Dev. 11 Arm Status
⎭
Bi-level
Bi-level
Bi-level
3
3
3
13 Bypass Dev. 12 Arm Status
Bi-level
3
14 Bypass Dev. 13 Arm Status
Bi-level
3
15
16
Bypass Dev. 14 Arm Status
Bypass Dev. 15 Arm Status
⎫
Bi-level
Bi-level
3
3
17 Bypass Dev. 16 Arm Status
Bi-level
3
18 Bypass Dev. 17 Arm Status
Bi-level
4
19
20
Bypass Dev. 18 Arm Status
Bypass Dev. 19 Arm Status
⎬ ^2/
Bi-level
Bi-level
4
4
21 Bypass Dev. 20 Arm Status
Bi-level
4
22
23
24
Bypass Dev. 21 Arm Status
Bypass Dev. 22 Arm Status
Bypass Dev. 23 Arm Status
⎭
Bi-level
Bi-level
Bi-level
4
4
4
25 Bypass Dev. 24 Arm Status
Bi-level
4
26 0V Reference
Analog
5
27 Lowest Cell Voltage
Analog
6
28 Highest Cell Voltage
Analog
7
29 Message Count
Analog
8
1/ For Battery A. 2/ For Battery B.
D13
D15
D14
D13
D12
D11
D10
D9
D8
D15
D14
D13
D12
D11
D10
D9
D8
D15
D14
D13
D12
D11
D10
D9
D8
D(15:4)
D(15:4)
D(15:4)
D(15:0)
SCD8638 Rev D 3/21/08
5
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