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AD5162BRMZ100-RL7 其他数据使用手册 - ADI（亚德诺）
制造商:
ADI（亚德诺）
分类:
数字电位器
封装:
MSOP-10
描述:
双通道， 256位， SPI数字电位计 Dual, 256-Position, SPI Digital Potentiometer
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AD5162BRMZ100-RL7数据手册
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AN-1291 Application Note
Q: How can I control a digital potentiometer that requires a 6-bit
word length using an 8-bit word length from my controller?
A: Serial peripheral interface (SPI) digital potentiometers operate
by disregarding the first MSBs and reading the next six bits.
See the relevant product data sheet for more information.
Q: How can I control a digital potentiometer that requires a 12-bit
word length using an 8-bit word length from my controller?
A: Issue a 2-byte word. The first four MSBs are disregarded.
See the relevant product data sheet for more information.
Q: How can multiple digital potentiometers be daisy-chained?
A: To daisy-chain digital potentiometers, the SDO pin of one
package must be tied to the SDI pin of the next package. The
clock period may need to be increased due to propagation delay.
In Figure 6, two AD5122/AD5142 digital potentiometers (U1 and
U2) are tied together. In this setup, 32 bits are required. The first
16 bits are sent to U2 and the second 16 bits are sent to U1.
During this 32-bit write, the
SYNC
pin remains low.
After all bits are clocked in, the
SYNC
pin is pulled high to
complete the write. The AD5144 and similar SPI devices
include internal counters to prevent data corruption due to
noise. If the number of clocks is different from expected, the
data is ignored. When the
SYNC
pin is high, the counter resets.
See the relevant product data sheet for more information.
Q: Can I program two channels of a multichannel digital
potentiometer at the same time?
A: Yes. With some digital potentiometers, such as the AD5251/
AD5252/AD5253/AD5254 and the AD5232/AD5233/AD5235, the
user can increment and decrement all the channels simultaneously.
In addition, the user can write to each electronically erasable
memory (EEMEM) and then issue a reset command to update
all the RDAC register settings simultaneously.
Some products, such as the AD5144, include an
LRDAC
pin
(for loading the RDAC input register), which transfers data
from the input register to the RDAC register and updates the
wiper position. A user can update either a single RDAC register
or all RDAC registers at once.
Q: Can the wiper setting of digital potentiometers be read back?
How about the contents of two RDAC registers of dual I
2
C-
compatible digital potentiometers, such as the AD5242 and
AD5282?
A: Yes. The user can read back the wiper setting with some
digital potentiometers.
The user can also read back the RDAC register content (the
RDAC address value of a specific channel); however, the user
can only read the RDAC channel selected during the previous
write mode. If the channel the user wants to read is different
from the channel previously written to, a dummy write command
is necessary to select the desired channel. Refer to the relevant
product data sheet for details.
Q: Is there a digital potentiometer controlled by a parallel input?
A: No.
Q: What are the
WP
pin, the
PR
pin, and the RDY pin features?
A: The
WP
pin stands for write protect. For example, on the
ADN2850, the
WP
pin disables any changes to the scratchpad
register contents. A scratchpad register directly controls the
digital resistor wiper and has no limit on the number of changes it
can make (unlike the EEPROM, which has a limit on the number
of writes).
However, commands that restore the wiper position using the
EEPROM are allowed. Therefore, the
WP
pin is used as a method
of protecting the EEPROM contents.
In addition, on the ADN2850, the hardware override preset (
PR
) pin
can be used to overwrite the scratchpad register with the EEPROM
contents.
The RDY pin signifies when commands have been completed,
thus indicating readiness for the next command.
See the relevant product data sheet for more information.
Q: What is the ESD rating of digital potentiometers?
A: All digital potentiometers have ESD ratings higher than 1 kV.
See the relevant product data sheet for more information.
MOSI
SSSCLKMISO
MICROCONTROLLER
SDI SDO
SCLK
SCLK
R
P
2.2kΩ
R
P
2.2kΩ
SDI SDO
U1 U2
AD5122/
AD5142
AD5122/
AD5142
SYNC
SYNC
DAISY CHAIN
V
LOGIC
V
LOGIC
12052-007
Figure 6. Daisy-Chaining Digital Potentiometers
Rev. A | Page 6 of 18
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