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| 型号： | EVAL-AD5259DBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5259DBZ |
| 标准包装： | 1 |
| 系列： | * |
AD5259
Data Sheet
Rev. C | Page 18 of 24
TOLERANCE READBACK MODES
Table 15. Traditional Readback of Tolerance (Individually)
S
7-Bit Device Address
0 SA 0 0 1 1 1 1 1 0 SA S
7-Bit Device Address
1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P
Slave Address Byte
Instruction Byte
Slave Address Byte
Sign + Integer Byte
↑
Repeat start
S
7-Bit Device Address
0 SA 0 0 1 1 1 1 1 1 SA S
7-Bit Device Address
1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P
Slave Address Byte
Instruction Byte
Slave Address Byte
Decimal Byte
↑
Repeat start
Table 16.Traditional Readback of Tolerance (Consecutively)
S
7-Bit Device
Address
0 SA 0 0 1 1 1 1 1 0 SA S
7-Bit Device
Address
(See Table 5)
1 SA D7 D6 D5 D4 D3 D2 D1 D0 MA D7 D6 D5 D4 D3 D2 D1 D0 NA P
Slave Address
Byte
Instruction Byte
Slave Address
Byte
Sign + Integer Byte
Decimal Byte
↑
Repeat start
Calculating RAB Tolerance Stored in Read-Only Memory
05026-005
A
D7
D6
D5
D4
D3
D2
D1
D0
SIGN
7 BITS FOR INTEGER NUMBER
26
25
24
23
22
21
20
D7
D6
D5
D4
D3
D2
D1
D0
8 BITS FOR DECIMAL NUMBER
2–8
2–1
2–2
2–3
2–4
2–5
2–6
2–7
Figure 41. Format of Stored Tolerance in Sign Magnitude Format with Bit Position Descriptions.
(Unit is Percent. Only Data Bytes are Shown.)
The AD5259 features a patented RAB tolerance storage in the
nonvolatile memory. The tolerance is stored in the memory
during factory production and can be read by users at any time.
The knowledge of stored tolerance allows users to accurately
calculate RAB. This feature is valuable for precision, rheostat
mode, and open-loop applications where knowledge of abso-
lute resistance is critical.
The stored tolerance resides in the read-only memory and is
expressed as a percentage. The tolerance is stored in two memory
location bytes in sign magnitude binary form (see Figure 41).
The two EEPROM address bytes are 11110 (sign + integer)
and 11111 (decimal number). The two bytes can be indi-
vidually accessed with two separate commands (see Table 15).
Alternatively, readback of the first byte followed by the second
byte can be done in one command (see Table 16). In the latter
case, the memory pointer will automatically increment from
the first to the second EEPROM location (increments from
11110 to 11111) if read consecutively.
In the first memory location, the MSB is designated for the
sign (0 = + and 1= ) and the seven LSBs are designated for
the integer portion of the tolerance. In the second memory
location, all eight data bits are designated for the decimal
portion of tolerance. Note the decimal portion has a limited
accuracy of only 0.1%. For example, if the rated RAB = 10 k
and the data readback from Address 11110 shows 0001 1100,
and Address 11111 shows 0000 1111, then the tolerance can
be calculated as
MSB: 0 = +
Next 7 MSB: 001 1100 = 28
8 LSB: 0000 1111 = 15 × 2–8 = 0.06
Tolerance = +28.06%
Rounded Tolerance = +28.1% and therefore,
RAB_ACTUAL = 12.810 k
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