AD5255BRU250-RL7 Analog Devices Inc, AD5255BRU250-RL7 Datasheet - Page 14

• Manufacturer Part Number: AD5255BRU250-RL7
• Manufacturer: Analog Devices Inc

Specifications of AD5255BRU250-RL7

• Number Of Elements: 3
• Resistance (max): 250KOhm
• Power Supply Requirement: Single/Dual
• Interface Type: Serial (2-Wire/I2C)
• Single Supply Voltage (typ): 5V
• Dual Supply Voltage (typ): ±2.5V
• Single Supply Voltage (min): 2.7V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): ±2.2V
• Dual Supply Voltage (max): ±2.7V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 24
• Lead Free Status / RoHS Status: Not Compliant

AD5255
RDAC Shortcut Commands
Eleven shortcut commands are provided for easy manipulation of
RDAC registers and their corresponding EEPROM memory
locations. These commands are shown in Table 9. A more
detailed discussion about the RDAC shortcut commands can
be found in the Theory of Operation section.
The interface for issuing an RDAC shortcut command is shown
in Figure 25. All shortcut commands require acknowledge poll-
ing to determine whether the command has finished executing.
RDAC Resistor Tolerance
The end-to-end resistance tolerance for each RDAC channel
is stored in read-only memory during factory production.
This information is read by using the address and bits speci-
fied in Table 8.
Table 8. Addresses for Reading Tolerance (CMD/ REG = 0, EE/ RDAC = 1, A4 = 1)
A4
1
1
1
1
1
1
A
SIGN
SIGN
D7
A3
1
1
1
1
1
1
D6
2
6
0
0
0
0
1
1
A2
Figure 26. Format of Stored Tolerance in Sign Magnitude with Bit Positions Descriptions Unit is in %. Only Data Bytes Shown.
D5
2
5
A1
0
0
1
1
0
0
7 BITS FOR INTEGER NUMBER
D4
2
4
A0
0
1
0
1
0
1
D3
2
3
Sign and 7-Bit Integer Values of RDAC0 Tolerance (Read-Only)
8-Bit Decimal Value of RDAC0 Tolerance (Read-Only)
Sign and 7-Bit Integer Values of RDAC1 Tolerance (Read-Only)
8-Bit Decimal Value of RDAC1 Tolerance (Read-Only)
Sign and 7-Bit Integer Values of RDAC2 Tolerance (Read-Only)
8-Bit Decimal Value of RDAC2 Tolerance (Read-Only)
Data Byte Description
D2
2
2
D1
2
1
D0
2
Rev. A | Page 14 of 20
0
A
Tolerance values are stored in percentage form. Figure 26 shows
the format of the tolerance data stored in memory. Each stored
tolerance uses two memory locations. The first location stores
the integer portion, while the second location stores the decimal
portion.
The resistance tolerance is stored in sign-magnitude format.
The MSB of the first memory location designates the sign
(0 = +, 1 = −) and the remaining seven LSBs are designated for
the integer portion of the tolerance. All eight bits of the second
memory location represent the decimal portion of the tolerance
value.
2
D7
–1
2
D6
–2
2
D5
8 BITS FOR DECIMAL NUMBER
–3
2
D4
–4
2
D3
–5
D2
2
–6
2
D1
–7
2
D0
–8
A