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DS3901 Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer DS3901
Beschreibung 8-Bit NV Variable Resistor
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 20 Seiten
DS3901 Datasheet, Funktion
www.DataSheet4U.com
Rev 0; 4/06
Triple, 8-Bit NV Variable Resistor
with Dual Settings and User EEPROM
General Description
The DS3901 is a triple, 8-bit nonvolatile (NV) variable
resistor. Each of the resistors has two setting registers,
which are selectable by software or by pin configura-
tion. The selected register determines the value of the
variable resistor. Additionally, all three resistors have a
high-impedance setting. Resistor R0 has the additional
flexibility of allowing an external shunt resistor to pro-
vide increased dynamic range. Internal address set-
tings allow the DS3901 slave address to be
programmed to one of 128 possible addresses. The
DS3901 also features an optional password-protection
scheme that allows the protection of sensitive data.
Features
o Three 256-Position Linear Digital Resistors
o Full-Scale Resistances 50k, 30k, 20k
o Dual NV Settings for Each Resistor
o Low Temperature-Coefficient Resistors
o I2C* Serial Interface
o Wide Operating Voltage (2.4V to 5.5V)
o Two-Level Password Write Protection
o 232 Bytes of User EEPROM
o Programmable Slave Address
o -40°C to +95°C Operating Temperature Range
Applications
Optical Transceivers
Optical Transponders
Instrumentation and Industrial Controls
RF Power Amps
Audio Power-Amp Biasing
Replacement for Mechanical Variable Resistors
and DIP Switches
Ordering Information
PART
TEMP RANGE
RESISTOR
VALUES FOR
R0, R1, AND R2
PIN-
PACKAGE
DS3901E+ -40°C to +95°C 50k, 30k, 20k14 TSSOP
+Denotes lead-free package.
Pin Configuration
TOP VIEW
SCL 1
SDA 2
ADD_SEL 3
BK_SEL 4
DIS 5
N.C. 6
GND 7
DS3901
TSSOP
14 VCC
13 N.C.
12 H2
11 L2
10 H1
9 H0
8 L0
Typical Operating Circuit appears at end of data sheet.
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
______________________________________________ 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.






DS3901 Datasheet, Funktion
Triple, 8-Bit NV Variable Resistor
with Dual Settings and User EEPROM
Typical Operating Characteristics (continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
0.65
0.45
0.25
0.05
-0.15
-0.35
-0.55
-0.75
0
R2 ABSOLUTE LINEARITY
vs. RESISTOR SETTING
51 102 153 204 255
SETTING (DEC)
0.65
0.45
0.25
0.05
-0.15
-0.35
-0.55
-0.75
0
R2 RELATIVE LINEARITY
vs. RESISTOR SETTING
51 102 153 204 255
SETTING (DEC)
PIN
1
2
3
4
5
6, 13
7
8
9
10
11
12
14
NAME
SCL
SDA
ADD_SEL
BK_SEL
DIS
N.C.
GND
L0
H0
H1
L2
H2
VCC
Pin Description
FUNCTION
I2C Clock Input
I2C Data I/O Pin
I2C Slave Address Select Pin
Bank Select Pin. This pin has an internal pulldown resistor, RBK.
High-Impedance Disable Input. This pin has an internal pullup resistor, RDIS.
No Connection
Ground
Resistor 0 Low Terminal
Resistor 0 High Terminal
Resistor 1 High Terminal
Resistor 2 Low Terminal
Resistor 2 High Terminal
Voltage Supply
6 _____________________________________________________________________

6 Page









DS3901 pdf, datenblatt
Triple, 8-Bit NV Variable Resistor
with Dual Settings and User EEPROM
MEMORY REGISTER 8Fh: STATUS
Factory Default:
Access Without Password:
Access With PW1 Password:
Access With PW2 Password:
Memory Type:
000x000xb
Read only
Read only
Read only
Volatile (SRAM)
bits 75
bit 4
bits 31
bit 0
8Fh 0 0 0 BSS 0 0 0
b7
These bits are 0.
BSS: A status bit that indicates the state of the BK_SEL pin.
0 = BK_SEL pin is low.
1 = BK_SEL pin is high.
These bits are 0.
DISS: A status bit that indicates the state of the DIS pin.
0 = DIS pin is low. Hi-Z control bits can be used to select high-impedance state for each resistor.
1 = DIS pin is high. All resistors are in a high-impedance state.
DISS
b0
MEMORY REGISTERS 90h93h: PW1 PASSWORD SETTING
Factory Default:
Access Without Password:
Access With PW1 Password:
Access With PW2 Password:
Memory Type:
00000000h
None
None
Write only
Nonvolatile (EEPROM)
90h 231 230 229 228 227 226 225 224
91h 223 222 221 220 219 218 217 216
92h 215 214 213 212 211 210
29
28
93h 27 26 25 24 23 22 21 20
b7 b0
These four bytes contain the password used to access
memory that is protected by the PW1 password.
12 ____________________________________________________________________

12 Page





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