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DS1854 Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer DS1854
Beschreibung Dual Temperature-Controlled Resistors
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 22 Seiten
DS1854 Datasheet, Funktion
Rev 0; 1/03
Dual Temperature-Controlled Resistors with
Two Monitors
General Description
The DS1854 dual temperature-controlled nonvolatile
(NV) variable resistors with two monitors consists of two
50k256-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-
www.DataSheeiEmtE4aUPl.RccoOimrcMuimtrye.mTohrey
variable resistor settings are stored in
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,
VCC, 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
PART
DS1854E-050
TEMP RANGE PIN-PACKAGE
-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
Typical Operating Circuit
VCC
4.7k
2-WIRE
INTERFACE
TX-FAULT
LOS
GROUND TO
DISABLE WRITE
PROTECT
VCC = 3.3V
4.7k
1
SDA
2
SCL
3
OUT1
4
IN1
5
OUT2
6
IN2
7
WPEN
8
GND
DS1854
16
VCC
H1 15
14
L1
13
H0
12
L0
0.1µF
DECOUPLING
CAP
TO LASER BIAS
CONTROL
TO LASER
MODULATION
CONTROL
11 Rx POWER*
MON2
10 Tx BIAS*
MON1
RHIZ 9 Tx DISABLE
DIAGNOSTIC
INPUTS
0 TO 2.5V FS
*Rx POWER AND Tx BIAS CAN BE ARBITRARILY
ASSIGNED TO THE MON INPUTS
Pin Configurations
TOP VIEW
A
IN1
SCL VCC
1 SDA
H1
2 SCL
VCC 16
H1 15
B OUT2 SDA
H0
3 OUT1
L1
4 IN1
L1 14
H0 13
5 OUT2 DS1854
C WPEN IN2 OUT1 MON2
L0 12
6 IN2
MON2 11
7 WPEN
D GND L0 RHIZ MON1
8 GND
MON1 10
RHIZ 9
1234
16-BALL CSBGA (4mm x 4mm)
1.0mm PITCH
16 TSSOP
______________________________________________ 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.






DS1854 Datasheet, Funktion
Dual Temperature-Controlled Resistors with
Two Monitors
Typical Operating Characteristics (continued)
(VCC = 5.0V, TA = +25°C, unless otherwise noted.)
RESISTOR 0 INL (LSB)
0.5
0.4
www.DataSheet4U0..c3 om
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0 25 50 75 100 125 150 175 200 225 250
POSITION
RESISTOR 1 DNL (LSB)
0.25
RESISTOR 0 DNL (LSB)
0.25
0.15
0.05
-0.05
-0.15
-0.25
0 25 50 75 100 125 150 175 200 225 250
POSITION
RESISTANCE vs. POWER-UP VOLTAGE
+25°C
300
RESISTOR 1 INL (LSB)
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0 25 50 75 100 125 150 175 200 225 250
POSITION
POSITION 00H RESISTANCE vs. TEMPERATURE
1.00
0.15 250
200
0.05
150
-0.05
100
-0.15
50
0.99
0.98
0.97
0.96
-0.25
0 25 50 75 100 125 150 175 200 225 250
POSITION
0
012345
POWER-UP VOLTAGE (V)
0.95
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
POSITION FFH RESISTANCE vs. TEMPERATURE
52.40
PPM vs. POSITION
340
52.30
52.20
290
240
190
52.10
52.00
51.90
140
+25°C TO +85°C
90
40
+25°C TO -40°C
-10
51.80
-40 -25 -10 5 20 35 50 65 80 95
TEMPERATURE (°C)
-60
0
50 100 150 200 250 300
POSITION
6 _____________________________________________________________________

6 Page









DS1854 pdf, datenblatt
Dual Temperature-Controlled Resistors with
Two Monitors
Register Map
A description of the registers is below. The registers
are read only (R) or read/write (R/W). The R/W registers
are writable only if write protect has not been asserted
(see the Memory Description section).
www.DataSheeAt4uU.xcoilmiary Device
MEMORY LOCATION EEPROM/SRAM
00 to 7F
EEPROM
R/W
R/W
DEFAULT SETTING
00
NAME OF LOCATION
Standards Data
Main Device
FUNCTION
MEMORY
LOCATION
EEPROM/
SRAM
R/W DEFAULT NAME OF LOCATION
SETTING
FUNCTION
00 to 01
Contains upper limit settings for temperature.
EEPROM
R/W
00
TMPlimhi (MSB to LSB) If the limit is violated, a flag in Main Device
byte 70h is set.
02 to 03
04 to 07
08 to 09
Contains lower limit settings for temperature.
EEPROM
R/W
00
TMPlimlo (MSB to LSB) If the limit is violated, a flag in Main Device
byte 70h is set.
EEPROM
R
00
Reserved
Contains upper limit settings for VCC. If the
EEPROM
R/W
00
VCClimhi (MSB to LSB) limit is violated, a flag in Main Device byte
70h is set.
0A to 0B
0C to 0F
10 to 11
EEPROM
EEPROM
EEPROM
R/W
R/W
Contains lower limit settings for VCC. If the
00 VCClimlo (MSB to LSB) limit is violated, a flag in Main Device byte
70h is set.
00 Reserved
Contains upper limit settings for MON1. If the
00 MON1limhi (MSB to LSB) limit is violated, a flag in Main Device byte
70h is set.
12 to 13
EEPROM
R/W
Contains lower limit settings for MON1. If the
00 MON1limlo (MSB to LSB) limit is violated, a flag in Main Device byte
70h is set.
14 to 17
18 to 19
EEPROM
EEPROM
R/W
00 Reserved
00 MON2limhi (MSB to LSB)
1A to 1B
EEPROM
R/W
00 MON2limlo (MSB to LSB)
Note: SRAM defaults are power-on defaults. EEPROM defaults are factory defaults.
Contains upper limit settings for MON2. If the
limit is violated, a flag in Main Device byte
70h is set.
Contains lower limit settings for MON2. If the
limit is violated, a flag in Main Device byte
70h is set.
12 ____________________________________________________________________

12 Page





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