AD5172 datasheet(20/22 Pages) AD

Part #	AD5172

Description	256-Position, One-Time Programmable, Dual-Channel, I2C Digital Potentiometers

PDF	22 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

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20 / 22 page

Data Sheet

AD5172/AD5173

I2C INTERFACE

analog.com

Rev. J | 20 of 22

Figure 51. Multiple AD5173 Devices on One I2C Bus

LEVEL SHIFTING FOR DIFFERENT VOLTAGE

OPERATION

If the SCL and SDA signals come from a low voltage logic controller

and are below the minimum VIH level (0.7 V × VDD), level shift

the signals for read/write communications between the AD5172/

AD5173 and the controller. Figure 52 shows one of the implemen-

tations. For example, when SDA1 is at 2.5 V, M1 turns off, and

SDA2 becomes 5 V. When SDA1 is at 0 V, M1 turns on, and SDA2

approaches 0 V. As a result, proper level shifting is established. It is

best practice for M1 and M2 to be low threshold N-channel power

MOSFETs, such as the FDV301N from On Semiconductor.

Figure 52. Level Shifting for Different Voltage Operation

AD5172 Datasheet(PDF) 20 Page - Analog Devices