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| 型号： | EVAL-AD5258DBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5258DBZ |
| 标准包装： | 1 |
| 系列： | * |
AD5258
Data Sheet
Rev. D | Page 18 of 24
TOLERANCE READBACK MODES
Table 15. Traditional Readback of Tolerance (Individually)
S
7-Bit Device Address
(See Table 5)
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 NA P
Slave Address Byte
Instruction Byte
Slave Address Byte
Sign + Integer Byte
↑
Repeat Start
S
7-Bit Device Address
(See Table 5)
0 SA 0 0 1 1 1 1 1 1 SA S
7-Bit Device Address
(See Table 5)
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
(See Table 5)
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
05029-
040
A
D7
D6
D5
D4
D3
D2
D1
D0
SIGN
SEVEN BITS FOR AN INTEGER NUMBER
26
25
24
23
22
21
20
D7
D6
D5
D4
D3
D2
D1
D0
EIGHT BITS FOR A DECIMAL NUMBER
2–8
2–1
2–2
2–3
2–4
2–5
2–6
2–7
Figure 39. Format of Stored Tolerance in Sign Magnitude Format with Bit Position Descriptions
(Unit is Percent; Only Data Bytes are Shown)
The AD5258 features a patented RAB tolerance storage in the
nonvolatile memory. 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 calcu-
late RAB. This feature is valuable for precision, rheostat mode,
and open-loop applications where knowledge of absolute
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 39). The
two EEPROM address bytes are 11110 (sign + integer) and 11111
(decimal number). The two bytes can be individually accessed
with two separate commands (see Table 15). Alternatively, read-
back 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 automatically increments 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
that 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 from Address 11111 shows
0000 1111, 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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