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| 型号： | EVAL-AD5273DBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/24页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD5273DBZ |
| 标准包装： | 1 |
| 系列： | * |
AD5273
Rev. H | Page 13 of 24
THEORY OF OPERATION
The AD5273 is a one-time programmable (OTP), set-and-forget,
6-bit digital potentiometer. The AD5273 allows unlimited 6-bit
adjustments prior to the OTP. OTP technology is a proven cost-
effective alternative over EEMEM in one-time memory program-
ming applications. The AD5273 employs fuse link technology to
achieve the memory retention of the resistance setting function.
It comprises six data fuses, which control the address decoder for
programming the RDAC, one user mode test fuse for checking setup
error, and one programming lock fuse for disabling any further
programming once the data fuses are programmed correctly.
ONE-TIME PROGRAMMING
Prior to OTP activation, the AD5273 presets to midscale during
power-on. After the wiper is set to the desired position, the resis-
tance can be permanently set by programming the T bit and the
one-time VDD_OTP to high and by coding the part properly (see
Figure 31). To blow the fuses to achieve a given nonvolatile setting,
the fuse link technology of the AD5273 requires a VDD_OTP from
5 V to 5.5 V for the 1 kΩ (DD8) and 10 kΩ (DD9) options, or
from 4.75 V to 5.25 V for the 50 kΩ (DYG) and 100 kΩ (DYH)
options. During operation, however, VDD can be 2.7 V to 5.5 V.
Therefore, a system supply that is lower than VDD_OTP requires an
external supply for OTP. The user is allowed only one attempt
to blow the fuses. If the user fails to blow the fuses on the first
attempt, the fuse structure may change such that they can never
be blown, regardless of the energy applied during subsequent
events. For details, see the Power Supply Considerations section.
The device control circuit has two validation bits, E1 and E0,
that can be read back in the read mode to check the program-
ming status, as shown in Figure 32. Users should always read
back the validation bits to ensure that the fuses are properly
blown. After the fuses have been blown, all fuse latches are
enabled upon subsequent power-on; therefore, the output
corresponds to the stored setting. Figure 30 shows a detailed
functional block diagram.
SDA
SCL
A
W
B
FUSES
EN
DAC
REG.
I2C INTERFACE
COMPARATOR
ONE-TIME
PROGRAM/TEST
CONTROL BLOCK
MUX
DECODER
FUSE
REG.
03224-031
Figure 30. Detailed Functional Block Diagram
S
0
1011
0
AD0
0
A
T
X
XXXX
XXA
XX
D5
D4
D3
D2
D1
D0
A
P
SLAVE ADDRESS BYTE
INSTRUCTION BYTE
DATA BYTE
03224-029
Figure 31. SDA Write Mode Bit Format
S
0
1
0
1
0
AD0
1
A
E1
E0
D5
D4
D3
D2
D1
D0
A
P
SLAVE ADDRESS BYTE
DATA BYTE
03224-030
Figure 32. SDA Read Mode Bit Format
SDA Bit Definitions and Descriptions
S = start condition.
P = stop condition.
A = acknowledge.
X = don’t care.
T = OTP programming bit. Logic 1 programs wiper position
permanently.
D5, D4, D3, D2, D1, D0 = data bits.
E1, E0 = OTP validation bits.
0, 0 = ready to program.
0, 1 = test fuse not blown successfully. (For factory setup
checking purpose only. Users should not see these
combinations.)
1, 0 = fatal error. Do not retry. Discard the unit.
1, 1 = programmed successfully. No further adjustments
possible.
AD0 = I2C device address bit. Allows maximum of two
AD5273s to be addressed.
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