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TPL0401X-10 Scheda tecnica(PDF) 11 Page - Texas Instruments

Il numero della parte TPL0401X-10
Spiegazioni elettronici  128-TAPS Single-Channel Digital Potentiometer With I2C Interface
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Produttore elettronici  TI1 [Texas Instruments]
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TPL0401A/B-10
I
2C INTERFACE
WIPER
REGISTER
SCL
SDA
GND
VDD
W
H
Copyright © 2017, Texas Instruments Incorporated
11
TPL0401A
TPL0401B
www.ti.com
SLIS144B – SEPTEMBER 2011 – REVISED FEBRUARY 2017
Product Folder Links: TPL0401A TPL0401B
Submit Documentation Feedback
Copyright © 2011–2017, Texas Instruments Incorporated
9 Detailed Description
9.1 Overview
The TPL0401x-10 has a single linear-taper digital potentiometer with 128 wiper positions and an end-to-end
resistance of 10 kΩ. The potentiometer can be used as a three-terminal potentiometer. The main operation of
TPL0401x-10 is in voltage divider mode.
The low (L) terminal of the TPL0401x-10 is tied directly to GND. The high (H) and low (GND) terminals of
TPL0401-10 are equivalent to the fixed terminals of a mechanical potentiometer. The H terminal must have a
higher voltage than the low terminal (GND). The position of the wiper (W) terminal is controlled by the value in
the Wiper Resistance (WR) 8-bit register. When the WR register contains all zeroes (zero-scale), the wiper
terminal is closest to its L terminal. As the value of the WR register increases from all zeroes to all ones (full-
scale), the wiper moves from the position closest to the GND terminal to the position closest to the H terminal. At
the same time, the resistance between W and GND increases, whereas the resistance between W and H
decreases.
9.2 Functional Block Diagram
9.3 Feature Description
The TPL0401x-10 device is a single-channel, linear taper digital potentiometer with 128 wiper positions. Default
power up state for the TPL0401x-10 is mid code (0×40). The TPL0401x-10 has the low terminal connected to
GND internally. The position of the wiper can be adjusted using an I2C interface. The TPL0401x-10 is available in
a 6-pin SOT package with a specified temperature range of –40°C to +125°C. The part has a 10-kΩ end-to-end
resistance and can operate with a supply voltage range of 2.7 V to 5.5 V. This kind of product is widely used in
setting the voltage reference for low power DDR3 memory. The TPL0401x-10 has the low terminal internal and
connected to GND.
9.4 Device Functional Modes
9.4.1 Voltage Divider Mode
The digital potentiometer generates a voltage divider when all three terminals are used. The voltage divider at
wiper-to-H and wiper-to-GND is proportional to the input voltage at H to L (see Figure 11).


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