DS1841N+ Maxim Integrated Products, DS1841N+ Datasheet

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DS1841N+

Manufacturer Part Number
DS1841N+
Description
Digital Potentiometer ICs IC RES LOG NV I2C 5.5V
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of DS1841N+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The DS1841 is a 7-bit, logarithmic, nonvolatile (NV) digi-
tal resistor that features an on-chip temperature sensor
and associated analog-to-digital converter (ADC). The
integrated temperature sensor indexes a 72-byte NV
lookup table (LUT) encompassing a temperature range
from -40°C to +100°C. The LUT output can drive the
resistor directly or be added to an NV initial-value regis-
ter (IVR) to drive the resistor. This flexible LUT-based
architecture allows the DS1841 to provide a tempera-
ture-compensated resistor output with arbitrary slope.
Programming is accomplished by an I
interface, which can operate at speeds of up to 400kHz.
Rev 2; 5/08
Registers and Modes are capitalized for clarity.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
4.7kΩ
APD BIAS CONTROL APPLICATION
Optical Transceivers
Linear and Nonlinear Compensation
Instrumentation and Industrial Controls
Mechanical Potentiometer Replacement
4.7kΩ
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
SDA
SCL
A1
A0
DS1841
General Description
RGND
GND
V
RW
RH
CC
Applications
3.3V
0.1μF
100pF
Temperature-Controlled, NV, I
2
CONVERTER
C-compatible
DC-DC
V
OUT
FB
V
APD
♦ 22kΩ to 3.7kΩ Adjustable Logarithmic Resistor
♦ 128 Wiper Tap Points
♦ On-Chip Temperature Sensor and ADC
♦ 72-Byte Lookup Table (LUT)
♦ I
♦ Address Pins Allow Up to Four DS1841s to Share
♦ Digital Supply of 2.7V to 5.5V
♦ -40°C to +100°C Operating Range
♦ 3mm x 3mm, 10-Pin TDFN Package
+ Denotes a lead-free package.
T&R = Tape and reel.
* EP = Exposed pad.
DS1841N+
DS1841N+T&R
with a 3.6kΩ Fixed Resistor
the Same I
2
C-Compatible Serial Interface
Logarithmic Resistor
PART
TOP VIEW
*EXPOSED PAD
2
C Bus
(3.0mm
SDA
SCL
10
1
-40°C to +100°C
-40°C to +100°C
TEMP RANGE
Ordering Information
N.C.
GND
9
2
×
3.0mm
DS1841
TDFN
V
RH
8
3
CC
Pin Configuration
RW
A1
×
7
4
0.8mm)
*EP
RGND
A0
6
5
PIN-PACKAGE
10 TDFN-EP*
10 TDFN-EP*
Features
2
C,
1

Related parts for DS1841N+

DS1841N+ Summary of contents

Page 1

... Address Pins Allow Up to Four DS1841s to Share the Same I ♦ Digital Supply of 2.7V to 5.5V 2 C-compatible ♦ -40°C to +100°C Operating Range ♦ 3mm x 3mm, 10-Pin TDFN Package Applications PART DS1841N+ DS1841N+T&R + Denotes a lead-free package. T&R = Tape and reel Exposed pad. TOP VIEW 3.3V V APD V OUT 0.1μ ...

Page 2

Temperature-Controlled, NV, I Logarithmic Resistor ABSOLUTE MAXIMUM RATINGS Voltage Range on SDA, SCL, and V Relative to GND .........................................-0.5V to +6.0V CC Voltage Range on RH, RW, A0, and A1 Relative to GND ................................-0. Operating Temperature Range .........................-40°C ...

Page 3

TEMPERATURE SENSOR CHARACTERISTICS (V = +2.7V to +5.5V -40°C to +100°C, unless otherwise noted PARAMETER SYMBOL Temperature Error Update Rate (Temperature and t FRAME Supply Conversion Time) ANALOG VOLTAGE MONITORING CHARACTERISTICS (V = +2.7V to +5.5V, ...

Page 4

Temperature-Controlled, NV, I Logarithmic Resistor ELECTRICAL CHARACTERISTICS (See Figure 3) (continued +2.7V to +5.5V -40°C to +100°C, timing referenced PARAMETER SYMBOL EEPROM Write Time A0, A1 Setup Time ...

Page 5

T = +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE 250 200 LUT MODE AND LUT ADDER MODE LUT MODE AND LUT ADDER MODE UPDATE MODE BIT = 1 UPDATE MODE BIT ...

Page 6

Temperature-Controlled, NV, I Logarithmic Resistor PIN NAME 2 1 SDA I C Serial Data. Input/output for I 2 GND Ground 3 V Power Supply Address Select Inputs. Determines I Slave Address Byte and Address Pins sections for ...

Page 7

LUT Adder Mode (Default) LUT Adder Mode is selected by setting the Update Mode bit to 1 and the Adder Mode bit to 1. This mode operates similar to LUT Mode with one major difference (see the LUT Mode and ...

Page 8

Temperature-Controlled, NV, I Logarithmic Resistor LUT Mode and LUT Adder Mode Block Diagram (Update Mode Bit = GND CONTROL SCL LOGIC/ REGISTERS SDA INTERFACE A0 A1 DATA TEMP SENSOR ADC V CC VOLTAGE *NOTE ...

Page 9

DECREASING LUT34 TEMPERATURE LUT33 LUT32 INCREASING LUT31 TEMPERATURE LUT30 1°C HYSTERESIS WINDOW TEMPERATURE (°C) Figure 1. LUT Hysteresis MSB SLAVE ADDRESS* *THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0, ...

Page 10

Temperature-Controlled, NV, I Logarithmic Resistor Memory Description The DS1841’s internal memory consists of both volatile and NV registers that are organized into eight byte Register 00h: Initial Value Register (IVR) FACTORY DEFAULT (IVR) 00h MEMORY TYPE NV MEMORY TYPE Volatile ...

Page 11

Register 03h: Control Register 1 (CR1) FACTORY DEFAULT 03h MEMORY TYPE Shadowed NV 03h Reserved Reserved Bit 7 Bits Reserved. Adder Mode This bit is valid only if the Update Mode bit = 1. Bit 1 0 ...

Page 12

Temperature-Controlled, NV, I Logarithmic Resistor Register 0Ah: Control Register 2 (CR2) FACTORY DEFAULT 00h MEMORY TYPE Volatile 0Ah Reserved Reserved Bit 7 Bits Reserved. Wiper Access Control This bit is valid only in LUT Mode and in ...

Page 13

Registers 80h to C7h: Temperature Lookup Register (LUT) FACTORY DEFAULT 00h MEMORY TYPE NV 80h to C7h Bit 7 These registers at location 80h to C7h are NV and serve to temperature compensate RW over the operating temperature range of ...

Page 14

Temperature-Controlled, NV, I Logarithmic Resistor SDA t BUF t LOW SCL t HD:STA STOP START NOTE: TIMING IS REFERENCE TO V AND V IL(MAX) IH(MIN) Figure Timing Diagram Byte read: A byte read is an 8-bit ...

Page 15

Writing multiple bytes to a slave multiple bytes can also be performed. During a sin- gle write sequence bytes in one page can be written at one time. If more than eight bytes are trans- ...

Page 16

Temperature-Controlled, NV, I Logarithmic Resistor tion, writes the slave address byte (R/W = 1), reads data with ACK or NACK as applicable, and generates a STOP condition. See Figure 4 for I Examples. Applications Information Power-Supply Decoupling To achieve the ...

Page 17

... DATE 0 11/07 Initial release. In Ordering Information table, changed part numbers from DS1841T+/DS1841T+T&R to DS1841N+/DS1841N+T&R. 1 3/08 In the Typical Operating Characteristics, corrected the supply current for TOCs 1, 2, and 3 from mA to μA. In Register 03h: Control Register 1 (CR1), changed the factory default from 00h to 03h ...

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