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PDF DS3901 Data sheet ( Hoja de datos )
| Número de pieza | DS3901 | |
| Descripción | 8-Bit NV Variable Resistor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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 50kΩ, 30kΩ, 20kΩ
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 50kΩ, 30kΩ, 20kΩ 14 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.
1 page  
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.)
CHANGE IN RESISTANCE
vs. TEMPERATURE
1.400
RESISTOR SETTING = FFh
1.200
R2
1.000
0800
0.600
0.400
0.200
R1
0.000
R0
-0.200
-0.400
-0.600
-40
-13 14 41 68
TEMPERATURE (°C)
95
RESISTANCE vs. SUPPLY VOLTAGE
0.10
RESISTOR SETTING = 7Fh
0.08
0.06
0.04 R2
0.02
R0
0
-0.02
-0.04 R1
-0.06
-0.08
-0.10
2.400
3.175 3.950 4.725
SUPPLY VOLTAGE (V)
5.500
RESISTANCE vs. POWER-UP
SUPPLY VOLTAGE
> 1MΩ
59
RESISTOR SETTING = FFh
57
55
53
51 R0
49
47
0 2.75 5.50
SUPPLY VOLTAGE (V)
RESISTANCE vs. POWER-DOWN
SUPPLY VOLTAGE
59 > 1MΩ
RESISTOR SETTING = FFh
57
55
53
51 R0
49
47
0 2.75 5.50
SUPPLY VOLTAGE (V)
0.65
0.45
0.25
0.05
-0.15
-0.35
-0.55
-0.75
0
R0 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
R0 RELATIVE LINEARITY
vs. RESISTOR SETTING
51 102 153 204 255
SETTING (DEC)
R1 ABSOLUTE LINEARITY
vs. RESISTOR SETTING
R1 RELATIVE LINEARITY
vs. RESISTOR SETTING
0.65
0.45
0.25
0.05
-0.15
-0.35
-0.55
-0.75
0
51 102 153 204 255
SETTING (DEC)
0.65
0.45
0.25
0.05
-0.15
-0.35
-0.55
-0.75
0
51 102 153 204 255
SETTING (DEC)
_____________________________________________________________________ 5
5 Page 
Triple, 8-Bit NV Variable Resistor
with Dual Settings and User EEPROM
MEMORY REGISTERS 85h–87h: PW1 EEPROM
Factory Default:
Access Without Password:
Access With PW1 Password:
Access With PW2 Password:
Memory Type:
00h
Read only
Read and Write
Read and Write
Nonvolatile (EEPROM)
85h–87h
EEPROM
MEMORY REGISTERS 88h-8Bh: PASSWORD ENTRY
Factory Default:
Access Without Password:
Access With PW1 Password:
Access With PW2 Password:
Memory Type:
00000000h
Write only
Write only
Write only
Volatile (SRAM)
88h 231 230 229 228 227 226 225 224
89h 223 222 221 220 219 218 217 216
8Ah 215 214 213 212 211 210
29
28
8Bh 27 26 25 24 23 22 21 20
b7 b0
There are two passwords for the DS3901, the PW1
password and the PW2 password. The memory map
register descriptions indicate the type of access granted
for each level of password used. See the Password
Protection section for details on password access.
MEMORY REGISTERS 8Ch–8Eh: SRAM
Factory Default:
Access Without Password:
Access With PW1 Password:
Access With PW2 Password:
Memory Type:
00h
Read and Write
Read and Write
Read and Write
Volatile (SRAM)
8Ch-8Eh
SRAM
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet DS3901.PDF ] | |
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