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Maxim > Design Support > Technical Documents > Application Notes > A/D and D/A Conversion/Sampling Circuits > APP 593
Maxim > Design Support > Technical Documents > Application Notes > Digital Potentiometers > APP 593
Maxim > Design Support > Technical Documents > Application Notes > General Engineering Topics > APP 593
Keywords: digital potentiometers, digital pots, faq, xicor, Dallastat
APPLICATION NOTE 593
Digital Potentiometers: Frequently Asked
Questions
Aug 10, 2001
Abstract: This application note answers frequently asked questions for digital potentiometers.
How do I set up the DS1267 in stacked configuration?
Connect the H0 terminal to the L1 terminal. With the Stack Select Bit (LSB of the 17-bit I/O Shift
Register) set to a 0, the multiplexed output, S
OUT
, will be the output seen at W0. With the Stack Select
Bit set to a 1, S
OUT
will be the output seen at W1. The new stacked potentiometer will use H1 as the
new upper terminal, L0 as the lower terminal and S
OUT
as the wiper, as determined by the setting of the
Stack Select Bit.
Are there any digital potentiometers that use an I
2
C compatible bus?
Many of our newer digital potentiometers and resistors use a 2-wire communication protocol that is
compatible with the I
2
C communication specification.
Can the DS1847/48 be used in general purpose applications?
Yes. The DS1847 and DS1848 devices contain two temperature controlled digital resistors and are
typically used in fiber monitoring and control applications. However, they can also function well in any
application that requires a resistance that is stable over temperature or needs to be auto-adjusted
according to temperature. As an added bonus, the DS1848 comes with 128 bytes of EEPROM.
If I increment/decrement to the end points of the digital potentiometer or resistor, will
the wiper wrap around?
No. When a wiper is incremented to the top rail of the potentiometer or resistor, it will hit the top most
position and stay there. Any further increment commands will not cause the setting to wrap around to the
bottom rail. The wiper will simply maintain its position at the top most setting. When sending a decrement
command after the wiper has reached the bottom most rail, the wiper will simply maintain the lowest
position and will not wrap around to the top rail.
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