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DS1859
Dual, Temperature-Controlled Resistors with
Internally Calibrated Monitors
______________________________________________ Maxim Integrated Products 1
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
General Description
The DS1859 dual, temperature-controlled, nonvolatile
(NV) variable resistors with three monitors consists of
two 50k or two 20k, 256-position, linear, variable
resistors; three analog monitor inputs (MON1, MON2,
MON3); and a direct-to-digital temperature sensor. The
device provides an ideal method for setting and tem-
perature-compensating bias voltages and currents in
control applications using minimal circuitry. The vari-
able resistor settings are stored in EEPROM memory
and can be accessed over the 2-wire serial bus.
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Diagnostic Monitoring
Features
SFF-8472 Compatible
Five Monitored Channels (Temperature, V
CC
,
MON1, MON2, MON3)
Three External Analog Inputs (MON1, MON2, MON3)
That Support Internal and External Calibration
Scalable Dynamic Range for External Analog Inputs
Internal Direct-to-Digital Temperature Sensor
Alarm and Warning Flags for All Monitored
Channels
Two 50kor Two 20k, Linear, 256-Position,
Nonvolatile Temperature-Controlled Variable
Resistors
Resistor Settings Changeable Every 2°C
Access to Monitoring and ID Information
Configurable with Separate Device Addresses
2-Wire Serial Interface
Two Buffers with TTL/CMOS-Compatible Inputs and
Open-Drain Outputs
Operates from a 3.3V or 5V Supply
Operating Temperature Range of -40°C to +95°C
Ordering Information
Rev 1; 11/03
PART RESISTANCE PIN-PACKAGE
DS1859E-050 50k 16 TSSOP
DS1859E-020 20k 16 TSSOP
DS1859E-050/T&R 50k
16 TSSOP
(Tape-and-Reel)
DS1859E-020/T&R 20k
16 TSSOP
(Tape-and-Reel)
DS1859B-050 50k 16-Ball CSBGA
DS1859B-020 20k 16-Ball CSBGA
A
TOP VIEW
B
C
D
1
CSBGA (4mm x 4mm)
1.0mm PITCH
TSSOP
324
MON3
OUT1IN2
MON1
L0GND
WPEN
L1
H0SDA
OUT2
H1
V
CC
SCLIN1
MON2
DS1859
SDA
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SCL
OUT1
IN1
OUT2
IN2
WPEN
GND
V
CC
H1
L1
H0
L0
MON3
MON2
MON1
Pin Configurations
DS1859
SDA
1
2
3
4
5
6
7
8
16
0.1µF
15
14
13
12
11
10
9
SCL
OUT1
IN1
OUT2
IN2
WPEN
GND
V
CC
H1
L1
H0
L0
MON3
MON2
MON1
GROUND TO
DISABLE WRITE
PROTECT
Rx POWER*
DIAGNOSTIC
INPUTS
TO LASER
MODULATION
CONTROL
TO LASER BIAS
CONTROL
DECOUPLING
CAP
Tx POWER*
Tx BIAS*
*SATISFIES SFF-8472 COMPATIBILITY
V
CC
V
CC
= 3.3V
4.7k4.7k
Tx-FAULT
LOS
2-WIRE
INTERFACE
Typical Operating Circuit
Seitenansicht 0
1 2 3 4 5 6 ... 27 28

Inhaltsverzeichnis

Seite 1 - 1.0mm PITCH

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors______________________________________________ Maxim Integrated Product

Seite 2 - DC ELECTRICAL CHARACTERISTICS

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors10 ____________________________________________________________________

Seite 3 - ANALOG VOLTAGE MONITORING

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 11

Seite 4 - AC ELECTRICAL CHARACTERISTICS

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors12 ____________________________________________________________________

Seite 5

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 13

Seite 6 - = 5.0V, T

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors14 ____________________________________________________________________

Seite 7

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 15

Seite 8 - Pin Description

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors16 ____________________________________________________________________

Seite 9 - Figure 1. Block Diagram

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 17

Seite 10 - Monitored Signals

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors18 ____________________________________________________________________

Seite 11 - Table 5. ADEN and ADFIX Bits

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 19

Seite 12 - Table 7. Auxiliary Device

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors2 _____________________________________________________________________

Seite 13 - Register Map

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors20 ____________________________________________________________________

Seite 14 - Main Device (continued)

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 21

Seite 15

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors22 ____________________________________________________________________

Seite 16

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 23

Seite 17

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors24 ____________________________________________________________________

Seite 18

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 25

Seite 19 - Table 01h

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors26 ____________________________________________________________________

Seite 20 - Table 01h (continued)

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors____________________________________________________________________ 27

Seite 21 - Table 03h

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated MonitorsMaxim cannot assume responsibility for use of any circuitry other than

Seite 22 - Internal Calibration

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors_____________________________________________________________________ 3

Seite 23 - Table 9. Right Shifting

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors4 _____________________________________________________________________

Seite 24 - 2-Wire Operation

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors_____________________________________________________________________ 5

Seite 25 - Read Operations

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors6 _____________________________________________________________________

Seite 26 - 2-Wire Serial-Port Operation

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors_______________________________________________________________________

Seite 27

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors8 _____________________________________________________________________

Seite 28 - Package Information

DS1859Dual, Temperature-Controlled Resistors withInternally Calibrated Monitors_____________________________________________________________________ 9

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