DS3906U+ Maxim Integrated Products, DS3906U+ Datasheet - Page 13

• Manufacturer Part Number: DS3906U+
• Description: IC RESIST VAR TRPL 10USOP
• Manufacturer: Maxim Integrated Products

Specifications of DS3906U+

• Taps: 64
• Resistance (ohms): 1.45K, 2.54K, 2.54K
• Number Of Circuits: 3
• Temperature Coefficient: 60 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resistance In Ohms: 1.45K, 2.54K, 2.54K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Reading Multiple Bytes from a Slave: The read oper-
ation can be used to read multiple bytes with a single
transfer. When reading bytes from the slave, the master
simply ACKs the data byte if it desires to read another
byte before terminating the transaction. After the mas-
ter reads the last byte it must NACK to indicate the end
of the transfer and generates a stop condition.
To achieve best results, it is highly recommended that a
decoupling capacitor is used on the I.C. power supply
pins. Typical values of decoupling capacitors are 0.01µF
FROM SYSTEM
CONTROLLER
DESIGN NOTES:
1. IN THIS APPLICATION A NUMBER OF LED DRIVERS ARE SET USING THE DS3906'S VARIABLE RESISTORS.
2. THE PARALLEL COMBINATION OF THE DS3906 VARIABLE RESISTOR R0 AND 105Ω (R
3. VALUES LARGER THAN THE SHOWN EXTERNAL RESISTORS (R
RESISTOR WITH LINEAR STEP INCREMENTS OF 0.6Ω RANGING FROM 66Ω TO 101Ω. THE SAME APPLIES FOR RESISTOR 1 (R1).
THE PARALLEL COMBINATION OF R2 AND 310Ω (R
1Ω RANGING FROM 187Ω TO 255Ω.
RESISTOR VALUES LOWER THAN THE SHOWN VALUES RESULT IN SMALLER STEP INCREMENTS. REFER TO THE RESISTOR TABLES AND
COMPUTE EQUIVALENT RESISTANCE TO FIND OUT THE RANGES.
0.1µF
4.7kΩ
Application Information
V
CC
Power Supply Decoupling
4.7kΩ
V
SCL
SDA
A0
A1
A2
GND
CC
RED LED PANEL
Triple NV Low Step Size Variable
DRIVERS
____________________________________________________________________
LED
EXT2
DS3906
) IS EQUIVALENT TO A VARIABLE RESISTOR WITH LINEAR STEP INCREMENTS OF
EXT0
R0
R1
R2
, R
EXT1
, AND R
H0
H1
H2
EXT2
GREEN LED PANEL
and 0.1µF. Use a high-quality, ceramic, surface-mount
capacitor, and mount it as close as possible to the V
and GND pins of the I.C. to minimize lead inductance.
It is permissible to have a voltage on the resistor-high
terminals that is higher than the voltage connected to
V
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 terminals regardless of the voltage present on V
EXT0
) RESULT IN LARGER STEP INCREMENTS AND
CC
Resistor Plus Memory
DRIVERS
R
R
) IS EQUIVALENT TO A VARIABLE
EXT0
EXT2
. For instance, connecting V
LED
= 105Ω
= 310Ω
High Resistor Terminal Voltage
Typical Operating Circuit
R
EXT1
= 105Ω
BLUE LED PANEL
DRIVERS
LED
CC
to 3.0V while one or
CC
CC
13
.