Datasheet

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General Description

The DS3501 is a 7-bit, nonvolatile (NV) digital poten-

tiometer featuring an output voltage range of up to 15.5V.

Programming is accomplished by an I

C-compatible

interface, which can operate at speeds of up to 400kHz.

External voltages are applied at the RL and RH inputs to

define the lowest and highest potentiometer outputs.

The DS3501 contains an on-chip temperature sensor

and associated analog-to-digital converter (ADC). The

ADC output addresses a 36-byte NV lookup table

(LUT). The LUT output can drive the pot directly or be

added to an NV initial-value register (IVR) to drive the

pot. This flexible LUT-based architecture allows the

DS3501 to provide a temperature-compensated poten-

tiometer output with arbitrary slope.

Applications

TFT-LCD V

COM

Calibration

Linear and Nonlinear Compensation

Instrumentation and Industrial Controls

Mechanical POT Replacement

Optical Transceivers

Features

♦ 128 Wiper Tap Points

♦ Full-Scale Resistance: 10kΩ

♦ On-Chip Temperature Sensor and ADC

♦ 36-Byte Lookup Table (LUT)

♦ I

C-Compatible Serial Interface

♦ Address Pins Allow Up to Four DS3501s to Share

the Same I

C Bus

♦ Digital Operating Voltage: 2.7V to 5.5V

♦ Analog Operating Voltage: 4.5V to 15.5V

♦ Operating Temperature: -40°C to +100°C

♦ Pin and Software Compatible with ISL95311

(Default Mode)

♦ 10-Pin μSOP Package

DS3501

High-Voltage, NV, I

C POT with Temp Sensor

and Lookup Table

______________________________________________

Maxim Integrated Products

Rev 0; 1/07

Denotes a lead-free package.

T&R denotes tape-and-reel.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

DS3501U+ -40°C to +100°C 10 µSOP

DS3501U+T&R -40°C to +100°C 10 µSOP

VOLATILE

WIPER REGISTER

NV IVR

36-BYTE

LUT

MEMORY

CONTROL

CIRCUITRY

AND ADDRESS

DECODE

TEMP

SENSOR

AND ADC

SDA

SCL

∑

DECODER

LEVEL

SHIFTER

127

126

125

DS3501

Functional Diagram

Pin Configuration and Typical Operating Circuit appear at

end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

Summary of content (14 pages)

PAGE 1
Rev 0; 1/07 High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table The DS3501 is a 7-bit, nonvolatile (NV) digital potentiometer featuring an output voltage range of up to 15.5V. Programming is accomplished by an I2C-compatible interface, which can operate at speeds of up to 400kHz. External voltages are applied at the RL and RH inputs to define the lowest and highest potentiometer outputs. The DS3501 contains an on-chip temperature sensor and associated analog-to-digital converter (ADC).
PAGE 2
DS3501 High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Relative to GND ...............-0.5V to +6.0V Voltage Range on V+ Relative to GND ..................-0.5V to +17V Voltage Range on SDA, SCL, A0, A1 Relative to GND..........-0.5V to (VCC + 0.5V), not to exceed 6.0V Voltage Range on RH, RL, RW...................................-0.5V to V+ Voltage Range Across RH and RL Pins .....................-0.5V to V+ Operating Temperature Range ...........
PAGE 3
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table (VCC = +2.7V to +5.5V, TA = -40°C to +100°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP Temperature Error Update Rate (Temperature and Supply Conversion Time) MAX UNITS ±5 °C 16 tFRAME ms ANALOG VOLTAGE MONITORING CHARACTERISTICS (VCC = +2.7V to +5.5V, TA = -40°C to +100°C, unless otherwise noted.
PAGE 4
DS3501 High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table I2C AC ELECTRICAL CHARACTERISTICS (continued) (VCC = +2.7V to +5.5V, TA = -40°C to +100°C, timing referenced to VIL(MAX) and VIH(MIN). See Figure 3.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 0.9 µs Data Hold Time tHD:DAT 0 Data Setup Time tSU:DAT 100 ns START Setup Time tSU:STA 0.6 µs SDA and SCL Rise Time tR (Note 13) 20 + 0.1CB 300 ns SDA and SCL Fall Time tF (Note 13) 20 + 0.
PAGE 5
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table 120 DEFAULT MODE LUT MODE 170 120 70 DEFAULT MODE 70 V+ = 15.5V, VCC = 5V SDA = SCL = VCC; RH, RL, RW ARE FLOATING 20 -40 -20 0 20 40 60 80 20 V+ = 15.5V SDA = SCL = VCC; RL, RH, RW ARE FLOATING 2.7 100 35 DEFAULT MODE 34 33 32 31 V+ = 15.5V, VCC = 5V SDA = SCL = VCC; RH, RL, RW ARE FLOATING 30 4.1 TEMPERATURE (°C) 5.5 -40 -20 0 SUPPLY VOLTAGE (V) 40 60 80 100 DIFFERENTIAL NONLINEARITY vs. POTENTIOMETER SETTING 0.
PAGE 6
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table DS3501 Block Diagrams V+ VCC RH GND POS 7Fh DS3501 SCL I2C INTERFACE SDA CONTROL LOGIC/ REGISTERS SEE BIT A0 WIPER REGISTER/ INITIAL VALUE REGISTER RW (WR/IVR) A1 00h POS 00h RL Default Mode Block Diagram (Update Mode bit = 0) VCC GND V+ SCL DS3501 I2C INTERFACE ONLY WHEN IN LUT-ADDER MODE SDA CONTROL INITIAL VALUE REGISTER (IVR) 00h* IVR DATA A0 LUT ADDRESS REGISTER A1 (LUTAR) TEMP SENSOR ADC VCC VOLTAGE TEMP 0Ch 36 BY
PAGE 7
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table The DS3501 operates in one of three operating modes: Default Mode, LUT Mode, or LUT Adder Mode. In Default Mode, the DS3501 is pin and software compatible with the ISL95311. The potentiometer’s wiper position is controlled by the Wiper Register (WR) and the NV Initial Value Register (IVR) via the I2C interface.
PAGE 8
DS3501 High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table Table 2. Default Mode Memory Map REGISTER NAME ADDRESS (HEX) VOLATILE/NONVOLATILE FACTORY/POWER-UP DEFAULT WR/IVR Wiper Register/Initial Value 00h* NV (Shadowed) 40h CR0 Control Register 0 02h V 00h CR1 Control Register 1 03h NV (Shadowed) 00h CR2 Control Register 2 0Ah V 00h *In Default Mode, both WR and IVR are accessed through memory location 00h. Refer to the Default Mode section for additional information.
PAGE 9
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table MEMORY LOCATION DECREASING TEMPERATURE LUT19 LUT Adder Mode LUT18 LUT Adder Mode is selected by setting the Update Mode bit (CR1.0) to 1 and the Adder Mode bit (CR1.1) to 1. This mode operates similar to LUT Mode with one major difference (see the LUT Mode and LUT Adder Mode Block Diagram). The Wiper Register is loaded with the sum of LUTVAL and IVR. Furthermore, in this mode, the values programmed into the LUT are signed two’s complement.
PAGE 10
DS3501 High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table Control Register 2 (CR2) POWER-UP DEFAULT 00h MEMORY TYPE Volatile 0Ah Reserved Reserved Reserved Reserved TEN Reserved AEN Standby bit7 bit0 bit7:3 Reserved bit2 TEN: Temperature Update Enable bar. This bit is valid only in LUT Mode and LUT Adder Mode. 0 = Normal LUT operation. The WR is automatically loaded with LUTVAL+IVR or LUTVAL following each temperature conversion.
PAGE 11
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table DS3501 SDA tBUF tHD:STA tLOW tR tSP tF SCL tHD:STA STOP tSU:STA tHIGH tSU:DAT START REPEATED START tSU:STO tHD:DAT NOTE: TIMING IS REFERENCE TO VIL(MAX) AND VIH(MIN). Figure 3. I2C Timing Diagram Slave devices: Slave devices send and receive data at the master’s request. Bus idle or not busy: Time between STOP and START conditions when both SDA and SCL are inactive and in their logic-high states.
PAGE 12
DS3501 High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table minate communication so the slave will return control of SDA to the master. Slave address byte: Each slave on the I 2 C bus responds to a slave address byte sent immediately following a START condition. The slave address byte contains the slave address in the most significant 7 bits and the R/W bit in the least significant bit. The slave address byte of the DS3501 is shown in Figure 2.
PAGE 13
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table DS3501 TYPICAL I2C WRITE TRANSACTION MSB START 0 LSB 1 0 1 SLAVE ADDRESS* 0 A1 A0 R/W MSB SLAVE ACK b7 LSB b6 READ/ WRITE b5 b4 b3 b2 b1 b0 MSB SLAVE ACK b7 LSB b6 b5 b4 REGISTER ADDRESS b3 b2 b1 b0 SLAVE ACK STOP DATA *THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PINS A0 AND A1. EXAMPLE I2C TRANSACTIONS (WHEN A0 AND A1 ARE CONNECTED TO GND).
PAGE 14
High-Voltage, NV, I2C POT with Temp Sensor and Lookup Table DS3501 Typical Operating Circuit R1 B1 G1 GATE 1 TFT CLCD CSTOR GATE 2 GATE 3 VCOM SDA I2C 2.7V 15.0V VCC V+ RH RW SCL DS3501 A0 A1 GND RL Pin Configuration Package Information For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.