MAX5422 查看數據表（PDF） - Maxim Integrated
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MAX5422 Datasheet PDF : 11 Pages
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256-Tap, Nonvolatile, SPI-Interface,
Digital Potentiometers
Pin Description
PIN
NAME
FUNCTION
1
VDD Power-Supply Input. Bypass VDD with a 0.1µF capacitor from VDD to GND.
2
SCLK Serial-Interface Clock Input
3
DIN Serial-Interface Data Input
4
CS Active-Low Digital-Input Chip Select
5
GND Ground
6
L
Low Terminal. The voltage at L can be greater than or less than the voltage at H. Current can flow into or
out of L.
7
W
Wiper Terminal
8
H
High Terminal. The voltage at H can be greater than or less than the voltage at L. Current can flow into or
out of H.
—
EP Exposed Pad. The exposed pad is not internally connected. Connect to GND or leave floating.
CS
SCLK
DIN
tCS0
tCSS
tDS
tCL
tCH
tDH
tCSW
tCP
tCSH
tCS1
Figure 1. Digital Interface and Timing Diagram
Detailed Description
The MAX5422/MAX5423/MAX5424 contain a resistor
array with 255 resistive elements. The MAX5422 has a
total end-to-end resistance of 50kΩ; the MAX5423 has
an end-to-end resistance of 100kΩ; and the MAX5424
has an end-to-end resistance of 200kΩ. The
MAX5422/MAX5423/MAX5424 allow access to the high,
low, and wiper terminals for a standard voltage-divider
configuration. H, L, and W can be connected in any
desired configuration as long as their voltages fall
between GND and VDD.
A simple, 3-wire, SPI serial interface moves the wiper
among the 256 tap points. The nonvolatile memory
stores the wiper position and recalls the stored wiper
position upon power-up. The nonvolatile memory is
guaranteed for 50 years for wiper data retention and up
to 200,000 wiper store cycles.
Analog Circuitry
The MAX5422/MAX5423/MAX5424 consist of a resistor
array with 255 resistive elements; 256 tap points are
accessible to the wiper, W, along the resistor string
between H and L. Select the wiper tap point by pro-
gramming the potentiometer through the 3-wire (SPI)
interface. Eight data bits, and a control byte program
the wiper position. The H and L terminals of the
MAX5422/MAX5423/MAX5424 are similar to the two
end terminals of a mechanical potentiometer. The
MAX5422/MAX5423/MAX5424 feature power-on reset
circuitry that loads the wiper position from the non-
volatile memory at power-up.
Digital Interface
The MAX5422/MAX5423/MAX5424 use a 3-wire, SPI-
compatible, serial data interface (Figure 1 and 2). This
write-only interface contains three inputs: chip-select
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