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AD5259BRMZ10-R7 Datasheet(PDF) 8 Page - Analog Devices |
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AD5259BRMZ10-R7 Datasheet(HTML) 8 Page - Analog Devices |
8 / 14 page AD5259 Preliminary Technical Data Rev. PrJ 7/22/04 | Page 8 of 14 two dummy bytes and proceed directly to the “Slave Address Byte” which would be followed by the “Read Back Data”. Calculating RAB Tolerance Stored in Read-Only Memory AA D7 D6 D5 D4 D3 D2 D1 D0 SIGN SIGN 7 BITS FOR INTEGER NUMBER 26 25 24 23 22 21 20 A 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 5. 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 calculate RAB accurately. 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 locations in sign magnitude binary form(see Figure 5). The two EEMEM address bytes are 11110(sign+integer) and 11111 (decimal number). The two bytes can be accessed individually in two separate commands(see Table 13ii). Alternatively, in order to allow read back of the first byte followed by the second byte in one command(see Table 13i), the memory pointer will automatically increment from the first to the second EEMEM locations(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 7 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. 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% and therefore RAB_ACTUAL = 12.806 kΩ EEMEM Write-Acknowledge Polling After each write operation to the EEMEM registers, an internal write cycle begins. The I2C interface of the device is disabled. To determine if the internal write cycle is complete and the I2C interface is enabled, interface polling can be executed. I2C interface polling can be conducted by sending a start condition followed by the slave address + the write bit. If the I2C interface responds with an ACK, the write cycle is complete and the interface is ready to proceed with further operations. Other-wise, I2C interface polling can be repeated until it succeeds. |
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