The DS1859 dual, temperature-controlled, nonvolatile
(NV) variable resistors with three monitors consists of
two 50kΩ or two 20kΩ, 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.
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 50kΩ or Two 20kΩ, 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
DS1859
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Diagnostic Monitoring
Ordering Information
PART
DS1859B-020
RESISTANCE
20kΩ
20kΩ
50kΩ
50kΩ
PIN-PACKAGE
16 CSBGA
16 CSBGA
16 CSBGA
16 CSBGA
Typical Operating Circuit
DS1859B-020+
DS1859B-050
DS1859B-050+
V
CC
V
CC
= 3.3V
4.7kΩ
2-WIRE
INTERFACE
Tx-FAULT
4.7kΩ
1
2
3
4
5
LOS
GROUND TO
DISABLE WRITE
PROTECT
6
7
8
SDA
SCL
OUT1
IN1
OUT2
IN2
WPEN
GND
V
CC
H1
L1
16
15
14
DECOUPLING
CAP
+Denotes
lead-free package.
Ordering Information continued at end of data sheet.
0.1µF
Pin Configurations
TOP VIEW
A
IN1
SCL
V
CC
H1
1 SDA
2 SCL
B
OUT2
SDA
H0
3 OUT1
L1
4 IN1
C
WPEN
IN2
OUT1
5 OUT2
MON3
6 IN2
7 WPEN
MON2
4
8 GND
V
CC
16
H1 15
L1 14
H0 13
TO LASER BIAS
CONTROL
TO LASER
MODULATION
CONTROL
DS1859
13
H0
12
L0
MON3
MON2
MON1
11 Rx POWER*
10 Tx POWER*
9 Tx BIAS*
DIAGNOSTIC
INPUTS
DS1859
L0 12
MON3 11
MON2 10
MON1 9
*SATISFIES SFF-8472 COMPATIBILITY
D
GND
1
L0
2
MON1
3
CSBGA (4mm x 4mm)
1.0mm PITCH
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.
Dual, Temperature-Controlled Resistors with
Internally Calibrated Monitors
DS1859
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Relative to Ground ...........-0.5V to +6.0V
Voltage Range on Inputs Relative
to Ground* ................................................-0.5V to V
CC
+ 0.5V
Voltage Range on Resistor Inputs Relative
to Ground* ................................................-0.5V to V
CC
+ 0.5V
Current into Resistors............................................................5mA
*Not
to exceed 6.0V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Operating Temperature Range ...........................-40°C to +95°C
Programming Temperature Range .........................0°C to +70°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
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