DS1859B-050+T&R;/B datasheet, PDF

Rev 4; 2/06

IT

TION K

VALUA

E

BLE

AVAILA

Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

General Description

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

50kΩ

PIN-PACKAGE

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

J-STD-020A

RECOMMENDED DC OPERATING CONDITIONS

(T

A

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Supply Voltage

Input Logic 1 (SDA, SCL, WPEN)

Input Logic 0 (SDA, SCL, WPEN)

Resistor Inputs (L0, L1, H0, H1)

Resistor Current

High-Z Resistor Current

Input Logic Levels (IN1, IN2)

I

RES

I

ROFF

Input logic 1

Input logic 0

1.5

0.9

SYMBOL

V

CC

V

IH

V

IL

(Note 1)

(Note 2)

CONDITIONS

MIN

2.85

0.7 x Vcc

-0.3

-3

0.001

TYP

MAX

5.5

V

CC

+ 0.3

+0.3 x V

CC

V

CC

+ 0.3

+3

0.1

UNITS

V

mA

µA

V

DC ELECTRICAL CHARACTERISTICS

(V

CC

= 2.85V to 5.5V, T

A

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Supply Current

Input Leakage

Low-Level Output Voltage

(SDA, OUT1, OUT2)

Full-Scale Input (MON1, MON2,

MON3)

Full-Scale V

CC

Monitor

I/O Capacitance

WPEN Pullup

Digital Power-On Reset

Analog Power-On Reset

C

I/O

R

WPEN

POD

POA

40

1.0

2.0

65

SYMBOL

I

CC

I

IL

V

OL1

V

OL2

3mA sink current

6mA sink current

At factory setting

(Note 4)

At factory setting

(Note 5)

CONDITIONS

(Note 3)

-200

0

2.4875

6.5208

2.5

6.5536

MIN

TYP

1

MAX

2

+200

0.4

0.6

2.5125

6.5864

10

100

2.2

2.6

UNITS

mA

nA

V

pF

kΩ

V

2

_____________________________________________________________________

Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

ANALOG RESISTOR CHARACTERISTICS

(V

CC

= 2.85V to 5.5V, T

A

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Position 00h Resistance (50kΩ)

Position FFh Resistance (50kΩ)

Position 00h Resistance (20kΩ)

Position FFh Resistance (20kΩ)

Absolute Linearity

Relative Linearity

Temperature Coefficient

SYMBOL

T

A

= +25°C

T

A

= +25°C

T

A

= +25°C

T

A

= +25°C

(Note 6)

(Note 7)

(Note 8)

CONDITIONS

MIN

0.65

40

0.20

16

-2

-1

50

TYP

1.0

50

0.40

20

MAX

1.35

60

0.55

24

+2

+1

UNITS

kΩ

LSB

ppm/°C

DS1859

ANALOG VOLTAGE MONITORING

(V

CC

= 2.85V to 5.5V, T

A

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Input Resolution

Supply Resolution

Input/Supply Accuracy

(MON1, MON2, MON3, V

CC

)

Update Rate for MON1, MON2,

MON3, Temp, or V

CC

Input/Supply Offset

(MON1, MON2, MON3, V

CC

)

SYMBOL

∆VMON

∆V

CC

A

CC

t

frame

V

OS

(Note 14)

At factory setting

CONDITIONS

MIN

TYP

610

1.6

0.25

30

0

0.5

45

5

MAX

UNITS

µV

mV

% FS

(full scale)

ms

LSB

DIGITAL THERMOMETER

(V

CC

= 2.85V to 5.5V, T

A

= -40°C to +95°C, unless otherwise noted.)

PARAMETER

Thermometer Error

SYMBOL

T

ERR

CONDITIONS

-40°C to +95°C

MIN

TYP

MAX

±3.0

UNITS

°C

NONVOLATILE MEMORY CHARACTERISTICS

(V

CC

= 2.85V to 5.5V)

PARAMETER

EEPROM Writes

SYMBOL

+70°C

CONDITIONS

MIN

50,000

TYP

MAX

UNITS

_____________________________________________________________________

3

Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

DS1859

AC ELECTRICAL CHARACTERISTICS

(V

CC

= 2.85V to 5.5V, T

A

= -40°C to +95°C, unless otherwise noted. See Figure 6.)

PARAMETER

SCL Clock Frequency

Bus Free Time Between STOP and

START Condition

Hold Time (Repeated)

START Condition

LOW Period of SCL Clock

HIGH Period of SCL Clock

Data Hold Time

Data Setup Time

START Setup Time

Rise Time of Both SDA and SCL

Signals

Fall Time of Both SDA and SCL

Signals

Setup Time for STOP Condition

Capacitive Load for Each Bus Line

EEPROM Write Time

SYMBOL

f

SCL

t

BUF

t

HD:STA

t

LOW

t

HIGH

t

HD:DAT

t

SU:DAT

t

SU:STA

t

R

t

F

t

SU:STO

C

B

t

W

CONDITIONS

Fast mode (Note 9)

Standard mode (Note 9)

Fast mode (Note 9)

Standard mode (Note 9)

Fast mode (Notes 9, 10)

Standard mode (Notes 9, 10)

Fast mode (Note 9)

Standard mode (Note 9)

Fast mode (Note 9)

Standard mode (Note 9)

Fast mode (Notes 9, 11, 12)

Standard mode (Notes 9, 11, 12)

Fast mode (Note 9)

Standard mode (Note 9)

Fast mode (Note 9)

Standard mode (Note 9)

Fast mode (Note 13)

Standard mode (Note 13)

Fast mode (Note 13)

Standard mode (Note 13)

Fast mode

Standard mode

(Note 13)

(Note 14)

10

MIN

0

1.3

4.7

0.6

4.0

1.3

4.7

0.6

4.0

0

100

250

0.6

4.7

20 + 0.1C

B

20 + 0.1C

B

20 + 0.1C

B

20 + 0.1C

B

0.6

4.0

400

20

300

1000

300

0.9

TYP

MAX

400

100

UNITS

kHz

µs

ns

µs

ns

µs

pF

ms

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

Note 6:

Note 7:

Note 8:

Note 9:

All voltages are referenced to ground.

I/O pins of fast-mode devices must not obstruct the SDA and SCL lines if V

CC

is switched off.

SDA and SCL are connected to V

CC

and all other input signals are connected to well-defined logic levels.

Full Scale is user programmable. The maximum voltage that the MON inputs read is approximately Full Scale, even if the volt-

age on the inputs is greater than Full Scale.

This voltage defines the maximum range of the analog-to-digital converter voltage, not the maximum V

CC

voltage.

Absolute linearity is the difference of measured value from expected value at DAC position. The expected value is a

straight line from measured minimum position to measured maximum position.

Relative linearity is the deviation of an LSB DAC setting change vs. the expected LSB change. The expected LSB change

is the slope of the straight line from measured minimum position to measured maximum position.

See the

Typical Operating Characteristics.

A fast-mode device can be used in a standard-mode system, but the requirement t

SU:DAT

> 250ns must then be met. This

is automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the

LOW period of the SCL signal, it must output the next data bit to the SDA line t

RMAX

+ t

SU:DAT

= 1000ns + 250ns = 1250ns

before the SCL line is released.

4

_____________________________________________________________________

Dual, Temperature-Controlled Resistors with

Internally Calibrated Monitors

Note 10:

After this period, the first clock pulse is generated.

Note 11:

The maximum t

HD:DAT

only has to be met if the device does not stretch the LOW period (t

LOW

) of the SCL signal.

Note 12:

A device must internally provide a hold time of at least 300ns for the SDA signal (see the V

IH MIN

of the SCL signal) to

bridge the undefined region of the falling edge of SCL.

Note 13:

C

B

—total capacitance of one bus line, timing referenced to 0.9 x V

CC

and 0.1 x V

CC

.

Note 14:

Guaranteed by design.

DS1859

Typical Operating Characteristics

(V

CC

= 5.0V, T

A

= +25°C, for both 50kΩ and 20kΩ versions, unless otherwise noted.)

SUPPLY CURRENT vs. TEMPERATURE

DS1859 toc01

SUPPLY CURRENT vs. VOLTAGE

DS1859 toc02

RESISTANCE vs. SETTING

50kΩ VERSION

50

RESISTANCE (kΩ)

40

30

20

10

0

DS1859 toc03

720

SDA = SCL = V

CC

680

SUPPLY CURRENT (µA)

700

SDA = SCL = V

CC

650

SUPPLY CURRENT (µA)

600

550

500

450

400

60

640

600

560

520

-40

-20

0

20

40

60

80

100

TEMPERATURE (°C)

3.0

3.5

4.0

4.5

5.0

5.5

0

50

100

150

200

250

VOLTAGE (V)

SETTING (DEC)

RESISTANCE vs. SETTING

20kΩ VERSION

15

RESISTANCE (kΩ)

DS1859 toc04

ACTIVE SUPPLY CURRENT

vs. SCL FREQUENCY

SDA = V

CC

ACTIVE SUPPLY CURRENT (µA)

720

DS1859 toc05

RESISTOR 0 INL (LSB)

0.8

0.6

RESISTOR 0 INL (LSB)

0.4

0.2

0

-0.2

-0.4

-0.6

-0.8

DS1859 toc06

20

760

1.0

680

10

640

5

600

0

50

100

150

200

250

SETTING (DEC)

560

0

100

200

300

400

SCL FREQUENCY (kHz)

-1.0

0

25 50 75 100 125 150 175 200 225 250

SETTING (DEC)

_____________________________________________________________________

5

Parameter Name	Attribute value
cone	Linear
Configuration	rheostat
Number of circuits	2
Number of taps	256
Resistance (ohms)	50k
interface	I²C
memory type	non-volatile
Voltage - Power	2.85 V ~ 5.5 V
characteristic	Optional address, temperature sensor
Tolerance	±20%
Temperature coefficient (typ.)	50 ppm/°C
Resistance - Vernier (Ohms) (Typical)	-
Operating temperature	-40°C ~ 95°C
Package/casing	16-LBGA，CSPBGA
Supplier device packaging	16-CSBGA（4x4）

DS1859B-050+T&R;/B

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