DS3901E Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Triple, 8-Bit NV Variable Resistor with Dual Settings and User EEPROM

Rev 0; 4/06
Triple, 8-Bit NV Variable Resistor
with Dual Settings and User EEPROM
General Description
The DS3901 is a triple, 8-bit nonvolatile (NV) variable
resistor. Each of the resistors has two setting registers,
which are selectable by software or by pin configura-
tion. The selected register determines the value of the
variable resistor. Additionally, all three resistors have a
high-impedance setting. Resistor R0 has the additional
flexibility of allowing an external shunt resistor to pro-
vide increased dynamic range. Internal address set-
tings allow the DS3901 slave address to be
programmed to one of 128 possible addresses. The
DS3901 also features an optional password-protection
scheme that allows the protection of sensitive data.
Features
♦ Three 256-Position Linear Digital Resistors
♦ Full-Scale Resistances 50kΩ, 30kΩ, 20kΩ
♦ Dual NV Settings for Each Resistor
♦ Low Temperature-Coefficient Resistors
♦ I²C Serial Interface
♦ Wide Operating Voltage (2.4V to 5.5V)
♦ Two-Level Password Write Protection
♦ 232 Bytes of User EEPROM
♦ Programmable Slave Address
♦ -40°C to +95°C Operating Temperature Range
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Audio Power-Amp Biasing
Replacement for Mechanical Variable Resistors
and DIP Switches
Ordering Information
PART
TEMP RANGE
RESISTOR
VALUES FOR
R0, R1, AND R2
PIN-
PACKAGE
DS3901E+ -40°C to +95°C 50kΩ, 30kΩ, 20kΩ 14 TSSOP
+Denotes lead-free package.
Pin Configuration
Typical Operating Circuit appears at end of data sheet.
TOP VIEW
SCL 1
SDA 2
ADD_SEL 3
BK_SEL 4
DIS 5
N.C. 6
GND 7
DS3901
TSSOP
14 V_CC
13 N.C.
12 H2
11 L2
10 H1
9 H0
8 L0
______________________________________________ Maxim Integrated Products 1
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