High Endurance EEPROM General Description AS1506 linear, 256
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AS1506
High Endurance EEPROM
General Description
AS1506 linear, 256-tap digital potentiometer specifically designed replace discrete/mechanical potentiometers ideal applications requiring low-temperature-coefficient variable resistor, such low-drift, programmable gain, amplifier circuit configurations. device controlled 3-wire SPI-compatible interface features internal EEPROM storing wiper positions. Several device variants available differentiated end-to-end resistance shown Table (see also Ordering Information page 16). Table Standard Products Model AS1506-10 AS1506-50 AS1506-100 End-to-End Resistance
Features
High Endurance: EEPROM cycles High Reliability: EEPROM years data retension 85°C Wiper Position Retained EEPROM loaded Power-Up Positions ±0.5LSB Voltage Divider Mode ±0.5LSB Voltage Divider Mode End-to-End Resistance: 10/50/100k End-to-End Resistance Temperature Coefficient: Low-Power Standby Mode: 100nA 5MHz SPI-Compatible Serial Interface Single-Supply Operation: +2.7 +5.5V 8-pin TDFN 3x3mm Package
3-wire SPI-compatible serial interface allows communication data rates 5MHz.The internal EEPROM stores last wiper position initialization during power-up low-power standby mode.
Applications
devices available 8-pin TDFN 3x3mm package. device ideal mechanical potentiometer replacement, low-drift programmable gain amplifiers, audio volume control, contrast control, low-drift programmable filters.
Figure Block Diagram
8-Bit Shift Register 8-Bit Latch HIGH 256-Position Decoder SCLK SDIO Interface PowerOn Reset 8-Bit EEPROM WIPER
AS1506
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AS1506
Data Sheet
Pinout
Assignments
Figure Assignments (Top View)
HIGH
SCLK
WIPER
AS1506
SDIO
Descriptions
Table Descriptions Number Description 5.5V Supply Voltage. Bypass with 0.1µF capacitor GND. Serial Clock Input Serial Data Input/Output Active-Low Chip Select Ground Terminal. voltage this greater than less than voltage HIGH. Current flow into this pin. Wiper Terminal WIPER High Terminal. voltage this greater than less than voltage HIGH LOW. Current flow into this pin. Exposed exposed internally connected. Leave floating. Name SCLK SDIO
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Data Sheet
Absolute Maximum Ratings
Stresses beyond those listed Table cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated Electrical Characteristics page implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Table Absolute Maximum Ratings Parameter Other Pins AS1506-10 Maximum Continuous Current into Pins HIGH, WIPER, Electrostatic Discharge Latch-Up
-0.3 -0.3
+7.0
Units
Comments
+0.55 +0.55 +0.55 -100 +150 +150 reflow peak soldering temperature (body temperature) specified accordance with IPC/JEDEC J-STD-020C "Moisture/Reflow Sensitivity Classification Non-Hermetic Solid State Surface Mount Devices". lead finish Pb-free leaded packages matte (100% Sn). MIL-Std. 883E 3015.7 methods JEDEC
AS1506-50 AS1506-100
Thermal Resistance Operating Temperature Range Storage Temperature Range Junction Temperature
Package Body Temperature
+260
maximum rating voltage must exceeded during Latch-up test device.
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Electrical Characteristics
+2.7 +5.5V, HIGH VDD, GND, TAMB values +5.0V, TAMB (unless otherwise specified). Table Electrical Characteristics Symbol Power Supply Parameter Condition 2.70 Unit
Standby Current Digital Inputs GND, TAMB Operating Current Includes Non-Volatile Write Memory (CMOS write) Performance (Voltage Divider Mode) Resolution AS1506-10 Integral Linearity AS1506-50 -100 Differential Non-Linearity End-to-End Resistance Temperature Coefficient Full Scale Error
±0.5 ±0.25 ±0.5 ±0.25 ±0.6 ±0.5 ±0.5 ±0.5 ±1.5 ±0.5 ±0.5
Taps
AS1506-10 AS1506-50 -100 TAMB AS1506-10 AS1506-50 AS1506-100 AS1506-10 AS1506-50 AS1506-100 AS1506-10 AS1506-50 -100 AS1506-50 -100 AS1506-10 AS1506-50 -100 AS1506-10 AS1506-50 AS1506-100 37.5
Zero Scale Error Performance (Variable Resistor Mode) Integral Linearity
Differential Non-Linearity
Performance (Resistor Characteristics) Wiper Resistance
12.5 62.5
Wiper Capacitance End-to-End Resistance
Inputs Outputs WIPER Voltage Range HIGH Voltage Range Voltage Range ILEAK ICONT Digital Input High Voltage Digital Input Voltage
GND0.3
VDD+
Digital Input Leakage Current Digital Input Capacitance Continuous current
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Data Sheet
Table Electrical Characteristics (Continued) Symbol Parameter Condition AS1506-10 AS1506-50 AS1506-100 AS1506-10 AS1506-50 AS1506-100 TAMB TAMB TAMB 1200 1100 1600 2200 Unit Dynamic Characteristics Wiper -3dB Bandwidth
Wiper Settling Time
Non-Volatile Memory Reliability Data Retention Endurance tBUSY
Years Write Cycles
Write Non-Volatile Register Busy Time
programming current operates only during power-up non-volatile memory writes. measured with potentiometer configured voltage-divider with HIGH GND. wiper terminal unloaded measured with high-input-impedance voltmeter. measured with potentiometer configured variable resistor. HIGH unconnected GND. condition, wiper terminal driven with source current 400µA 10k, 80µA 50k, 40µA 100k. conditions, wiper terminal driven with source current 200µA 10k, 40µA 50k, 20µA 100k. wiper resistance measured using source currents given Note number worst case resistance over positions. device draws higher supply current when digital inputs driven with voltages between (VDD 0.5V) (GND 0.5V). Wiper midscale with 10pF load measurement) GND. source peak peak sinus signal) applied HIGH WIPER output measured. bandwidth occurs when WIPER/HIGH value lower than WIPER/HIGH value. Wiper-settling time worst-case rise-time measured between successive wiper positions. HIGH VDD, GND; WIPER unloaded measured with 10pF load. This parameter tested ensured characterization.
Timing Characteristics
+2.7 +5.5V, HIGH VDD, GND, TAMB values +5.0V, TAMB (unless otherwise specified). Figure page Digital timing data guaranteed design characterization, production tested. Table Timing Characteristics Symbol fSCLK tCL80 tCSS tCSH tCS0 tCS1 tCSW tBUSY Parameter SCLK Frequency SCLK Clock Period SCLK Pulse-Width High SCLK Pulse-Width CSN-Fall SCLK Rise Setup SCLK-Rise CSN-Rise Hold SDIO SCLK Setup SDIO Hold after SCLK SCLK-Rise CSN-Fall Delay CSN-Rise SCLK-Rise Hold Pulse-Width High Write Non-Volatile Register Busy Time Condition Unit
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Data Sheet
Typical Operating Characteristics
(unless otherwise specified). Figure Position 10k, Divider Mode
Figure Position 10k, Divider Mode
(LSB)
(LSB)
-0.2 -0.4 -0.6 -0.8
-0.2 -0.4 -0.6 -0.8
Position
Position
Figure Position 50k, Divider Mode
Figure Position 50k, Divider Mode
(LSB)
-0.1 -0.2 -0.3 -0.4 -0.5
(LSB)
-0.1 -0.2 -0.3 -0.4 -0.5
Position
Position
Figure Position 100k, Divider Mode
Figure Position 100k, Divider Mode
(LSB)
-0.1 -0.2 -0.3 -0.4 -0.5
(LSB)
-0.1 -0.2 -0.3 -0.4 -0.5
Position
Position
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Figure Position 10k, Varistor Mode
Figure Position 10k, Varistor Mode
(LSB)
-0.2 -0.4 -0.6 -0.8
(LSB)
-0.4 -0.8 -1.2 -1.6
Position
Position
Figure Position 50k, Varistor Mode
Figure Position 50k, Varistor Mode
(LSB)
-0.2 -0.4 -0.6 -0.8
(LSB)
-0.2 -0.4 -0.6 -0.8
Position
Position
Figure Position 100k, Varistor Mode Mode
Figure Position 100k, Varistor
(LSB)
(LSB)
-0.2 -0.4 -0.6 -0.8
-0.2 -0.4 -0.6 -0.8
Position
Position
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Data Sheet
Figure Wiper Resistance TAP;
Figure Wiper Resistance TAP;
Resistance
Resistance
Position
Position
Figure Resistor Temperature
Figure Gain Bandwidth
100k
Resistance
Gain (dB)
1000 10000
Temperature (°C)
Frequency (kHz)
Figure EEPROM Data Retention Temperature
10000
Data Retension (years)
1000
Temperature (°C)
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Detailed Description
AS1506 contains resistor array with resistive elements (tap points), total end-to-end resistance 100k (see Ordering Information page 16). device provides high, low, wiper terminals standard voltage-divider configuration. Pins HIGH, LOW, WIPER connected configuration long their voltages fall between VDD. 3-wire, SPI-compatible serial interface controls movement wiper among points. EEPROM stores wiper position recalls stored wiper position upon power-up. EEPROM typically holds wiper data years wiper store cycles.
Analog Circuit
points accessible wiper along resistor string between pins HIGH (similar terminals mechanical potentiometer). wiper point selected programming data bits control byte 3-wire serial interface (see Programming Device page 10). Note: Integrated power-on reset circuitry loads wiper position from EEPROM power-up.
Digital Interface
AS1506 uses SPI-compatible 3-wire interface command settings device consisting input signals (chip-select CSN, data clock SCLK) bi-directional data (SDIO). Driving enables serial interface command/data passed into device synchronously each SCLK rising edge. There 16-bit commands write data into wiper register non-volatile memory, 8-bit commands transferring data between wiper register non-volatile memory read data stored wiper register non-volatile memory. 8-bit commands implemented 16-bit command structure alternatively. this case first bits shifted through interface significant. data byte passed writing commands represents position wiper. After loading 16-bit command while low, loaded command executed next rising edge CSN, simultaneously serial interface disabled. signal must during whole serial input stream through SPI, otherwise data interface corrupted. Note: data-in stream does exactly contain digits, command executed rising edge CSN. Figure Serial Data Timing
tCS0 tCSS SCLK
tCSW tCS1 tCSH
SDIO
Standby Mode
Low-power standby mode enable high. After read access standby mode entered cycles SCLK after issuing last data wiper non-volatile register. digital inputs stable there only leakage power dissipation device. This power dissipation defined with 0.1uA (typ)
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Data Sheet
EEPROM (Non-Volatile Register)
There internal EEPROM register implemented retain wiper position after power down. During ongoing write cycle non-volatile register (tBUSY time) system must powered down. Data retention defines ability EEPROM retain data over time. qualification been done according JEDEC Retention Lifetime Specification (A117). EEPROM cycled specified endurance limit before data retention test done. Based activation energy 0.6eV data retention time derates over temperature shown Figure page non-volatile register endurance cycles data retention years typical non-volatile register factory trimmed mid-scale.
Power-Up
AS1506 contains integrated power-up circuit. power data transferred from non-volatile memory wiper register. wiper register moves stored position. This data transfer takes after supply reached trigger level.
Programming Device
Write commands (see Table require clock cycles (see Figure page clock command data. Copy Read commands (see Table clock cycles clock command (see Figure page clock cycles. clock cycle commands data bits (D7:D0) insignificant. Table Command/Data Word Format Command Write Wiper Register Write Non-Volatile Register Copy Wiper Register NonVolatile Register Copy Non-Volatile Register Wiper Register Read Non-Volatile Register Read Wiper Register
Commands
Write Wiper Register
This 16-bit command (see Figure page 12). first byte represents command word starting with command, second byte represents data written wiper register (starting with MSB). Data 0000 0000 wiper moves closest position LOW, with data 1111 1111 wiper moves closest position HIGH. Note: power-up wiper position stored non-volatile memory automatically loaded into wiper register, wiper moves related position.
Write Non-Volatile Register
This 16-bit command (see Figure page 12). first byte represents command word starting with command, second byte represents data written non-volatile memory. wiper position changed this command, since wiper register affected. There write non-volatile register time defined timing specification, which required storing data non-volatile register. During this time device must powered down, otherwise data stored non-volatile register corrupted.
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Copy Wiper Register Non-Volatile Register
This command implemented 16-bit command. data stored wiper register transferred non-volatile memory, keep data during power-down. There automatic trigger this command during power-down device. This command must triggered before powering down device. There write non-volatile register time defined timing specification, which required storing data non-volatile register. During this time device must powered down, otherwise data stored non-volatile register corrupted.
Copy Non-Volatile Register Wiper Register
This command implemented 16-bit command. data stored non-volatile register transferred wiper register, wiper register moves stored position. This command automatically executed during power system.
Read Non-Volatile Register
AS1506 features capability read data from non-volatile register interface (see Figure page 12). This command implemented 16-bit command. SDIO bi-directional pin. During phase sequence SDIO used input command byte. After rising edge SDIO output pin, data stored non-volatile register read serially, first. data propagation starts second rising edge SCLK after rising edge CSN. must high during read operation. With next falling edge SDIO input again.
Read Wiper Register
AS1506 features capability read data from wiper register interface (see Figure page 12). This command implemented 16-bit command. SDIO bi-directional pin. During phase sequence, SDIO used input command byte. After rising edge SDIO output pin, data stored wiper register read serially, first. wiper position unchanged. data propagation starts second rising edge SCLK after rising edge CSN. must high during read operation. With next falling edge SDIO input again. Figure 8-Bit Command Word
SCLK
SDIO
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Data Sheet
Figure 16-Bit Command/Data Word
SCLK
SDIO
Figure 16-Bit Read Command Word
SCLK
SDIO
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Application Information
AS1506 intended circuits requiring digitally controlled adjustable resistance, such contrast control (where voltage biasing adjusts display contrast), programmable filters with adjustable gain and/or cutoff frequency.
Programmable Filter
Figure shows configuration 1st-order programmable filter. gain filter adjusted calculated (R1/R2) cutoff frequency (fC) adjusted calculated 1/(2 Figure Programmable Filter Circuit
HIGH VOUT WIPER
AS1506
HIGH
AS1506
WIPER
Offset Voltage Gain Adjustment
Connect AS1506 nullify offset voltage over operating temperature range. Install another AS1506 potentiometer feedback path adjust gain (Figure 25). Figure Offset Voltage Adjustment Circuit
AS1506
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Data Sheet
Positive Bias Control
device used applications where voltage-divider variable resistor used make adjustable, positive LCD-bias voltage, such AS1120 Driver. provides buffering gain resistordivider network made potentiometer (Figure fixed resistor variable resistor (Figure 27). Figure Positive Bias Control using Voltage Divider
HIGH
VOUT
AS1506
WIPER
Figure Positive Bias Control using Variable Resistor
VOUT HIGH
AS1506
WIPER
Adjustable Voltage Reference
Figure shows device used feedback resistor adjustable voltage-reference application. Output voltages external voltage references, supervisory reset thresholds, brightness control independently adjusted changing wiper position AS1506. Figure Adjustable Voltage Reference Circuit VOUT 1.23V(50k/R2(k)
HIGH VOUTREF
WIPER
AS1506
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Data Sheet
Package Drawings Markings
device available 8-pin TDFN 3x3mm package. Figure 8-pin TDFN 3x3mm Package
E2/2
INDEX AREA (D/2 xE/2)
INDEX AREA (D/2 xE/2) VIEW
BVIEW
Term inal
atum RMINA SIDE
Symbol
0.70 0.00
0.75 0.02 0.20
0.80 0.05 0.15 0.13
0.15 0.10 0.10 0.05 0.08 0.10
Notes
Symbol
3.00 3.00
D2/2
SEATING PLANE 0.08
1.60 1.35 0.30 0.20 0.25
0.40
2.50 1.75 0.50 0.35
0.30 0.65
Notes
Notes: Dimensioning tolerancing conform ASME Y14.5M-1994. dimensions millimeters, angle degrees. total number terminals. Terminal identifier terminal numbering convention shall conform JESD 95-1 SPP-012. Details terminal identifier optional, must located within area indicated. terminal identifier either mold, embedded metal mark feature. Dimension applies metallized terminal measured between 0.15 0.30mm from terminal tip. refers maximum number terminals side. Unilateral coplanarity zone applies exposed heat sink slug well terminals.
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Data Sheet
Ordering Information
device available standard products shown Table Table Ordering Information Model AS1506-BTDT-10 AS1506-BTDT-50 AS1506-BTDT-100 Marking ASMO ASMN ASMM Description 256-Tap, Non-Volatile, Digital Potentiometer 256-Tap, Non-Volatile, Digital Potentiometer 256-Tap, Non-Volatile, Digital Potentiometer End-to-End Resistance 100k Delivery Form Tape Reel Tape Reel Tape Reel Package 8-pin TDFN 3x3mm 8-pin TDFN 3x3mm 8-pin TDFN 3x3mm
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Copyrights
Copyright 1997-2007, austriamicrosystems Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered rights reserved. material herein reproduced, adapted, merged, translated, stored, used without prior written consent copyright owner. products companies mentioned trademarks registered trademarks their respective companies.
Disclaimer
Devices sold austriamicrosystems covered warranty patent indemnification provisions appearing Term Sale. austriamicrosystems makes warranty, express, statutory, implied, description regarding information forth herein regarding freedom described devices from patent infringement. austriamicrosystems reserves right change specifications prices time without notice. Therefore, prior designing this product into system, necessary check with austriamicrosystems current information. This product intended normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, high reliability applications, such military, medical life-support lifesustaining equipment specifically recommended without additional processing austriamicrosystems each application. shipments less than parts manufacturing flow might show deviations from standard production flow, such test flow test location. information furnished here austriamicrosystems believed correct accurate. However, austriamicrosystems shall liable recipient third party damages, including limited personal injury, property damage, loss profits, loss use, interruption business indirect, special, incidental consequential damages, kind, connection with arising furnishing, performance technical data herein. obligation liability recipient third party shall arise flow austriamicrosystems rendering technical other services.
Contact Information
Headquarters austriamicrosystems A-8141 Schloss Premstaetten, Austria Tel: 3136 Fax: 3136
Sales Offices, Distributors Representatives, please visit:
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