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PDF DS3905U-020 Data sheet ( Hoja de datos )
| Número de pieza | DS3905U-020 | |
| Descripción | Triple 128-Position Nonvolatile Digital Variable Resistor/Switch | |
| Fabricantes | Dallas Semiconducotr | |
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Rev 1; 8/03
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
General Description
The DS3904/DS3905 contain three nonvolatile (NV) low
temperature coefficient, variable digital resistors. Each
resistor has 128 user-selectable positions. Additionally,
the DS3904/DS3905 have a high-impedance setting that
allows each resistor to function as a digital switch. The
DS3904/DS3905 can operate over a 2.7V to 5.5V supply
voltage range, and communication with the device is
achieved through a 2-wire serial interface. Address pins
allow multiple DS3904/DS3905s to operate on the same
two-wire bus. The DS3904 has one address pin, allow-
ing two DS3904s to share the bus, while the DS3905
has three address pins, allowing up to eight DS3905s to
share a common bus. The low-cost and small size of the
DS3904/DS3905 make them ideal replacements for con-
ventional mechanical trimming resistors.
Applications
Power-Supply Calibration
Cell Phones and PDAs
Fibre Optic Transceiver Modules
Portable Electronics
Small and Low-Cost Replacement for
Conventional Mechanical Trimming Resistors/
Dip Switches
Test Equipment
Features
♦ Three 20kΩ, 128-Position Linear Digital Resistors
♦ Resistor Settings are Stored in NV Memory
♦ Each Resistor has a High-Impedance Setting for
Switch Operation to Control Digital Logic
♦ Low Temperature Coefficient
♦ 2-Wire Serial Interface
♦ 2.7V to 5.5V Operating Range
♦ -40°C to +85°C Industrial Temperature
♦ Packaging: 8-Pin µSOP for DS3904, 10-pin µSOP
for DS3905
Ordering Information
PART
DS3904U-020
DS3905U-020
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
8 µSOP
10 µSOP
RESISTANCE
20kΩ + Hi-Z
20kΩ + Hi-Z
Pin Configurations
TOP VEIW
SDA 1
SCL 2
VCC 3
GND 4
DS3904
µSOP
8 A0
7 H0
6 H1
5 H2
A1 1
SDA 2
SDL 3
VCC 4
GND 5
DS3905
µSOP
10 A2
9 A0
8 H0
7 H1
6 H2
Typical Operating Circuit
VCC
DS3904/DS3905
0.1µF
VCC
4.7kΩ 4.7kΩ
RESISTOR 0
20kΩ
ADDR F8h
2-WIRE
MASTER
(DS3905 ONLY)
SCL
SDA
RESISTOR 1
20kΩ
A0 ADDR F9h
A1
A2
RESISTOR 2
20kΩ
ADDR FAh
GND
VCC
RHIZ
H0
R10
VCC
INTERFACE EXAMPLES
VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
RHIZ
H1
R11
VIN
DIGITAL
LOGIC
2-WIRE
ADDRESSABLE
SWITCH (USING 00h
AND RHIZ SETTINGS)
RHIZ
H2
GAIN
CONTROL
R12
_____________________________________________ 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.
1 page  
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
(VCC = +5.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT
vs. TEMPERATURE
160
140 VCC = +5V
120
VCC = +3V
100
80
60
40 SDA = SCL =VCC
ADDRESS PINS
20 CONNECTED TO GND
0
-40
-20 0 20 40
TEMPERATURE (°C)
60
80
TEMPERATURE COEFFICIENT
vs. RESISTOR SETTING
600
RESISTORS
500 0, 1, AND 2
400
300
200 TC OF +25°C TO +85°C
TC OF +25°C TO -40°C
100
0
-100
0
20 40 60 80 100 120
RESISTOR SETTING (DEC)
RESISTANCE
vs. POWER-UP VOLTAGE
100
>5.5MΩ
90
RESISTORS
0, 1, AND 2
80
70 EEPROM
60 RECALL
50
40
30 PROGRAMMED
20 RESISTANCE
10
0
0
POSITION 3Fh
12345
POWER-UP VOLTAGE (V)
6
SUPPLY CURRENT
vs. SCL FREQUENCY
200
180
VCC = SDA = +5V
ADDRESS PINS
160 CONNECTED TO GND
140
120
100
80
60
40
20
0
0 50 100 150 200 250 300 350 400
SCL FREQUENCY (kHz)
POSITION 7Fh RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
1.0
0.8
0.6
0.4
RESISTORS 0, 1, AND 2
0.2
0
-0.2
-0.4
-40 -20
0 20 40 60
TEMPERATURE (°C)
80
RESISTANCE
vs. POWER-DOWN VOLTAGE
100
>5.5MΩ
90
80
RESISTORS
0, 1, AND 2
70
60
50
40
30 PROGRAMMED
20 RESISTANCE
10
0
0
POSITION 3Fh
12345
POWER-DOWN VOLTAGE (V)
6
RESISTANCE
vs. RESISTOR SETTING
25
RESISTORS
0, 1, AND 2
20
15
10
5
0
0 25 50 75 100 125
RESISTOR SETTING (DEC)
POSITION 00h RESISTANCE PERCENT
CHANGE FROM +25°C vs. TEMPERATURE
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
-0.5
-1.0 RESISTORS 0, 1, AND 2
-1.5
-2.0
-2.5
-40 -20 0 20 40 60 80
TEMPERATURE (°C)
POSITION 3Fh RESISTANCE
vs. SUPPLY VOLTAGE
13.0
12.5
12.0
RESISTORS
0, 1, AND 2
11.5
11.0
10.5
10.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
_____________________________________________________________________ 5
5 Page 
Triple 128-Position Nonvolatile Digital
Variable Resistor/Switch
The DS3904/DS3905 can operate in the following three
modes:
1) Slave Receiver Mode: Serial data and clock are
received through SDA and SCL, respectively. After
each byte is received, an acknowledge bit is trans-
mitted. Start and stop conditions are recognized as
the beginning and end of a serial transfer. Address
recognition is performed by hardware after the
slave (device) address and direction bit has been
received.
2) Slave Transmitter Mode: The first byte is received
and handled as in the slave receiver mode.
However, in this mode the direction bit indicates
that the transfer direction is reversed. Serial data is
transmitted on SDA by the DS3904/DS3905 while
the serial clock is input on SCL. Start and stop con-
ditions are recognized as the beginning and end of
a serial transfer.
3) Slave Address: The command/control byte is the
first byte received following the start condition from
the master device. The command/control byte con-
sists of a 4-bit device identifier. For the DS3904, the
identifier is followed by the device-select bits 0, 0,
and A0. For the DS3905, the identifier is followed by
the device-select bits A2, A1, A0. The device identi-
fier is used by the master device to select which
device is to be accessed. When reading or writing
the DS3904/DS3905, the device-select bits must
match the device-select pin(s). The last bit of the
command/control byte (R/W) defines the operation
to be performed. When set to a ‘1’, a read operation
is selected, and when set to a ‘0’, a write operation
is selected.
Following the start condition, the DS3904/DS3905 moni-
tor the SDA bus checking the device-type identifier
being transmitted. Upon receiving the control code, the
appropriate device address bit, and the read/write bit,
the slave device outputs an acknowledge signal on the
SDA line.
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS3904/
DS3905, decouple the power supply with a 0.01µF or
0.1µF capacitor. Use a high-quality ceramic surface-
mount capacitor. Surface-mount components minimize
lead inductance, which improves performance, and
ceramic capacitors tend to have adequate high-fre-
quency response for decoupling applications.
High Resistor Terminal Voltage
It is possible to have a voltage on the resistor-high termi-
nals that is higher than the voltage connected to VCC.
For instance, connecting VCC to 3.0V while one or more
of the resistor high terminals are connected to 5.0V
allows a 3V system to control a 5V system. The 5.5V
maximum still applies to the limit on the resistor high ter-
minals regardless of the voltage present on VCC.
Chip Information
TRANSISTOR COUNT: DS3904: 6905
DS3905: 6921
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information, go to www.maxim-ic.
com/packages.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet DS3905U-020.PDF ] | |
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