BEU8635-12 Datasheet, PDF (4/8 Pages) Aeroflex Circuit Technology – Balancing for 12-Cell Battery Cell Voltage Monitoring and Telemetry

32-Word Telemetry
To reduce data bus bandwidth usage, the 8635-12 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"..
Table III – 32-Word Telemetry
Item Telemetry Title
1 4V Reference
2 Total Battery Voltage 1
3 Total Battery Voltage 2
4 Total Battery Voltage 3
5 Share Bus Voltage
6 Reserved
7 Cell 1 Voltage
8 Cell 2 Voltage
9 Cell 3 Voltage
10 Cell 4 Voltage
11 Cell 5 Voltage
12 Cell 6 Voltage
13 Cell 7 Voltage
14 Cell 8 Voltage
15 Cell 9 Voltage
16 Cell 10 Voltage
17 Cell 11 Voltage
18 Cell 12 Voltage
19 Reserved
20 Reserved
21 Reserved
22 Reserved
23 Reserved
24 Reserved
25 Reserved
26 Reserved
27 Reserved
28 Reserved
29 Reserved
30 Reserved
31 Message Count
32 Overvoltage Latch Status
Telemetry Reply
Type Word
Reply Bits
Analog 1
Analog 2
Analog 3
Analog 4
Analog 5
-
6
Analog 7
Analog 8
Analog 9
Analog 10
Analog 11
Analog 12
Analog 13
Analog 14
Analog 15
Analog 16
Analog 17
Analog 18
-
19
-
20
-
21
-
22
-
23
-
24
-
25
-
26
-
27
-
28
-
29
-
30
Analog 31
Bi-level 32
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
8-Word Telemetry
To reduce data bus bandwidth usage, the 8635-12 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 IV – 8-Word Telemetry
Item Telemetry Title
1 Overvoltage Level Status
2 Reserved
3 Reserved
4 Reserved
5 0V Reference
6 Lowest Cell Voltage
7 Highest Cell Voltage
8 Message Count
Telemetry Reply
Type
Word
Bi-Level
1
-
2
-
3
-
4
Analog
5
Analog
6
Analog
7
Analog
8
Reply Bits
D13
-
-
-
D(15:4)
D(15:4)
D(15:4)
D(15:0)
SCD8635-12 Rev A 3/3/08
4
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