MAX5128ELA+T Maxim Integrated Products, MAX5128ELA+T Datasheet - Page 9

• Manufacturer Part Number: MAX5128ELA+T
• Description: IC POT DGTL LP 128TAP 8-UDFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX5128ELA+T

• Taps: 128
• Resistance (ohms): 22K
• Number Of Circuits: 1
• Temperature Coefficient: 50 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: Up/Down
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-µDFN
• Resistance In Ohms: 22K
• Number Of Pots: Single
• Taps Per Pot: 128
• Resistance: 22 KOhms
• Wiper Memory: Non Volatile
• Digital Interface: Serial (2-Wire)
• Operating Supply Voltage: 2.7 V to 5.25 V
• Supply Current: 1.5 uA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Description/function: 128-Tap Nonvolatile Linear Taper Digital Potentiometer
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.25 V
• Supply Voltage (min): 2.7 V
• Tolerance: 25 %
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX5128ELA+TTR

Figure 2. Digital-Interface Timing Diagram with t
Figure 3. Digital-Interface Command Diagram
The MAX5128 features a 2-wire interface consisting of
two logic inputs (UP and DN). Logic inputs UP and DN
control the wiper position and program the position to
the nonvolatile memory. Transition UP from high to low
with DN low to increment the wiper position. Transition
DN from high to low with UP low to decrement the wiper
position (see Figures 1, 2, and 3). When the wiper decre-
ments, it decreases the resistance between W and L
(and it increases the resistance between H and W).
To program the nonvolatile memory, force UP high,
then force DN high, and then transition either input
(UP/DN) from high to low (see Figure 3).
The wiper performs a make-before-break transition,
ensuring that an open circuit during a transition from
one resistor tap to another does not occur. The wiper
does not wrap around when it reaches either end of the
resistor array (max/min). Additional transition com-
DN
UP
Potentiometer in 2mm x 2mm µDFN Package
DN
UP
INCREMENTS
WIPER
128-Tap, Nonvolatile, Linear-Taper Digital
_______________________________________________________________________________________
t
PWH
DECREMENTS
WIPER
t
PWL
Digital Interface
WRITE
NVM
BUSY
t
BUSY
t
MS2
mands in the direction of the end point do not change
the tap position.
The logic inputs also feature pulse glitch immunity
(20ns) to protect the wiper from transitioning due to
glitches (see Figure 4).
The internal EEPROM consists of a 7-bit nonvolatile
memory that retains the value written to it even after
power-down. To program the nonvolatile memory, force
UP high, then force DN high, and then transition either
input (UP/DN) from high to low. A nonvolatile write
requires a busy time of 14ms (max). During the busy
time, any nonvolatile write requests are ignored as well
as requests to increment or decrement the wiper posi-
tion. Upon power-up, the wiper returns to the position
stored in the nonvolatile register. The MAX5128 fea-
tures a factory-default wiper position of midscale.
WRITE
NVM
t
WS
t
BUSY
WRITE
NVM
t
WP
t
WH
t
BUSY
INCREMENTS
WIPER
Write NV Register
DECREMENTS
WIPER
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