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参数资料
| 型号： | AD5258BRMZ501 |
| 厂商： | Analog Devices, Inc. |
| 元件分类： | 数字电位计 |
| 英文描述： | Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
| 中文描述： | 非易失，I2C兼容的64工位，数字电位器 |
| 文件页数： | 18/24页 |
| 文件大小： | 1299K |
| 代理商： | AD5258BRMZ501 |
AD5258
TOLERANCE READBACK MODES
Rev. 0 | Page 18 of 24
Table 15. Traditional Readback of Tolerance (Individually)
7-Bit Device Address
(See Table 5)
0 SA 0 0 1 1 1 1 1 0 SA S
Slave Address Byte
Instruction Byte
7-Bit Device Address
(See Table 5)
0 SA 0 0 1 1 1 1 1 1 SA S
Slave Address Byte
Instruction Byte
S
7-Bit Device Address
(See Table 5)
Slave Address Byte
↑
Repeat start
1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P
Sign + Integer Byte
S
7-Bit Device Address
(See Table 5)
Slave Address Byte
↑
Repeat start
1 SA D7 D6 D5 D4 D3 D2 D1 D0 NA P
Decimal Byte
Table 16.Traditional Readback of Tolerance (Consecutively)
7-Bit Device Address
(See Table 5)
0 SA 0 0 1 1 1 1 1 0 SA S
Slave Address Byte
Instruction Byte
S
7-Bit Device Address
(See Table 5)
Slave Address Byte
1 SA D7 D6 D5 D4 D3 D2 D1 D0 MA D7 D6 D5 D4 D3 D2 D1 D0 NA P
Sign + Integer Byte
Decimal Byte
↑
Repeat start
Calculating R
AB
Tolerance Stored in Read-Only Memory
0
A
A
A
D7
D6
D5
D4
D3
D2
D1
D0
SIGN
SIGN
7 BITS FOR INTEGER NUMBER
2
6
2
5
2
4
2
3
2
2
2
1
2
0
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 R
AB
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 R
AB
. 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 R
AB
= 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,
R
AB_ACTUAL
= 12.810 k
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| AD5258BRMZ50-R7 | 功能描述:IC POT DGTL I2C 50K 64P 10MSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 标准包装:3,000 系列:DPP 接片:32 电阻（欧姆）:10k 电路数:1 温度系数:标准值 300 ppm/°C 存储器类型:非易失 接口:3 线串行（芯片选择，递增，增/减） 电源电压:2.5 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WFDFN 裸露焊盘 供应商设备封装:8-TDFN（2x3） 包装:带卷 (TR) |
| AD5258BRMZ50-R71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
| AD5258EVAL | 功能描述:BOARD EVAL FOR AD5258 DGTL POT RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:- 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| AD5258EVAL2 | 制造商:AD 制造商全称:Analog Devices 功能描述:Nonvolatile, I2C-Compatible 64-Position, Digital Potentiometer |
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