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AD5258BRMZ11 Datasheet(PDF) 18 Page - Analog Devices |
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AD5258BRMZ11 Datasheet(HTML) 18 Page - Analog Devices |
18 / 24 page AD5258 Rev. 0 | 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 A AA D7 D6 D5 D4 D3 D2 D1 D0 SIGN 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 40. 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. 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 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 40). 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, 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 that the decimal portion has a limited accuracy of only 0.1%. For example, if the rated RAB = 10 kΩ 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 kΩ |
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