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DS1854
Dual Temperature-Controlled Resistors with
Two 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 DS1854 dual temperature-controlled nonvolatile
(NV) variable resistors with two monitors consists of two
50k 256-position linear variable resistors, two analog
monitor inputs (MON1, MON2), and a direct-to-digital
temperature sensor. The device provides an ideal
method for setting and temperature-compensating bias
voltages and currents in control applications using min-
imal circuitry. The variable 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
Four Total Monitored Channels (Temperature,
V
CC
, MON1, MON2)
Two External Analog Inputs (MON1, MON2)
Internal Direct-to-Digital Temperature Sensor
Two 50k, 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
Resistor Disable (Open-Circuit) Function
2-Wire Serial Interface
Two Buffers with TTL/CMOS-Compatible Inputs
and Open-Drain Outputs
Operates from a 3.3V or 5V Supply
SFF-8472 Compatible
Ordering Information
Rev 0; 1/03
PART
TEMP RANGE
PIN-PACKAGE
DS1854E-050
-40°C to +95°C
16 TSSOP
DS1854E-050/T&R
-40°C to +95°C
16 TSSOP
(Tape-and-Reel)
DS1854B-050
-40°C to +95°C
16-Ball CSBGA
A
TOP VIEW
B
C
D
1
16-BALL CSBGA (4mm x 4mm)
1.0mm PITCH
16 TSSOP
324
MON2
OUT1IN2
RHIZ
L0GND
WPEN
L1
H0SDA
OUT2
H1
V
CC
SCLIN1
MON1
DS1854
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
MON2
MON1
RHIZ
Pin Configurations
DS1854
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
MON2
MON1
RHIZ
GROUND TO
DISABLE WRITE
PROTECT
Rx POWER*
DIAGNOSTIC
INPUTS
0 TO 2.5V FS
TO LASER
MODULATION
CONTROL
TO LASER BIAS
CONTROL
DECOUPLING
CAP
Tx BIAS*
Tx DISABLE
*Rx POWER AND Tx BIAS CAN BE ARBITRARILY
ASSIGNED TO THE MON INPUTS
V
CC
V
CC
= 3.3V
4.7k4.7k
TX-FAULT
LOS
2-WIRE
INTERFACE
Typical Operating Circuit
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Shrnutí obsahu

Strany 1 - Two Monitors

DS1854Dual Temperature-Controlled Resistors withTwo Monitors______________________________________________ Maxim Integrated Products 1For pricing deli

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors10 ____________________________________________________________________ADEN(ADDRESSENABLE)

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors____________________________________________________________________ 11Variable ResistorsT

Strany 4

DS1854Register MapA description of the registers is below. The registersare read only (R) or read/write (R/W). The R/W registersare writable only if w

Strany 5

DS1854Dual Temperature-Controlled Resistors withTwo Monitors____________________________________________________________________ 13MEMORYLOCATIONEEPRO

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors14 ____________________________________________________________________MEMORYLOCATIONEEPRO

Strany 7

DS1854Dual Temperature-Controlled Resistors withTwo Monitors____________________________________________________________________ 15MEMORYLOCATIONEEPRO

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors16 ____________________________________________________________________MEMORYLOCATIONEEPRO

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors____________________________________________________________________ 17MEMORYLOCATIONEEPRO

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors18 ____________________________________________________________________Temperature Convers

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors____________________________________________________________________ 19the address does no

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors2 _____________________________________________________________________PARAMETERSYMBOLCOND

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors20 ____________________________________________________________________slaves. The bus mus

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the DS1854, the device-select bits must match oneof two valid device addresses, 00h or the addressregistered in Table 01 location 8Ch. The last bit of

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DS1854Dual Temperature-Controlled Resistors withTwo MonitorsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors_____________________________________________________________________ 3PARAMETERSYMBOLCOND

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors4 _____________________________________________________________________PARAMETERSYMBOLCOND

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors_____________________________________________________________________ 5AC ELECTRICAL CHARA

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors6 _____________________________________________________________________RESISTOR 1 DNL (LSB

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors_____________________________________________________________________ 7Detailed Descriptio

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors8 _____________________________________________________________________DEVICEADDRESSAD (AU

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DS1854Dual Temperature-Controlled Resistors withTwo Monitors_____________________________________________________________________ 9Monitored SignalsEa

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