MAX5460(2002) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX5460
(Rev.:2002)

32-Tap FleaPoT™, 2-Wire Digital Potentiometers

Maxim Integrated 

32-Tap FleaPoT™, 2-Wire Digital

Potentiometers

Detailed Description

The MAX5460–MAX5468 consist of a fixed resistor and a

wiper contact with 32-tap points that are digitally con-

trolled through a 2-wire serial interface. Three resistance

values are available: 10kΩ (MAX5466/MAX5467/

MAX5468), 50kΩ (MAX5463/MAX5464/MAX5465), and

100kΩ (MAX5460/MAX5461/MAX5462).

The MAX5462/MAX5465/MAX5468 are designed to oper-

ate as potentiometers. In this configuration, the low termi-

nal of the resistor array is connected to ground (pin 2).

The MAX5461/MAX5464/MAX5467 perform as variable

resistors. In these devices, the wiper terminal and high

terminal of the resistor array are connected at pin 5.

The MAX5460/MAX5463/MAX5466 are similar variable

resistors, except the low terminal is connected to

ground (pin 2).

CS

Digital Interface Operation

The MAX5460–MAX5468 have two modes of operation

when the serial interface is active: increment and

decrement mode. The serial interface is only active

when CS is low.

The CS and U/D inputs control the position of the wiper

along the resistor array. When CS transitions from high to

low, the part will go into increment mode if U/D is high,

and into decrement mode if U/D is low. Once the mode is

set, the device will remain in that mode until CS goes high

again. A low-to-high transition at the U/D pin will incre-

ment or decrement the wiper position depending on the

current mode (Figures 1 and 2).

When the CS input transitions to high (serial interface

inactive), the value of the counter is stored and the

wiper position is maintained.

Note that when the wiper reaches the maximum (or mini-

mum) tap position, the wiper will not wrap around to the

minimum (or maximum) position.

tCU

U/D

W

tIL

tCI

tIH

tSETTLE

NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.

Figure 1. Serial Interface Timing Diagram, Increment Mode

CS

tCU

tIH

U/D

tIC

tSETTLE

tIC

tIL

tCI

W

tSETTLE

tSETTLE

NOTE: "W" IS NOT A DIGITAL SIGNAL. IT REPRESENTS WIPER TRANSITIONS.

Figure 2. Serial Interface Timing Diagram, Decrement Mode

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