Advance Information CAT5112 32-Tap Digitally Programmable Potentiometer (DPP™) FEATURES APPLICATIONS ■ 32 Position Linear Taper Potentiometer ■ Automated Product Calibration ■ Non-volatile NVRAM Wiper Storage ■ Remote Control Adjustments ■ Low Power CMOS Technology ■ Offset, Gain and Zero Control Systems ■ Single Supply Operation: 2.5V-6.0V ■ Tamper-Proof Calibrations ■ Increment Up/Down Serial Interface ■ Contrast, Brightness and Volume Controls ■ Resistance Values: 10K, 20K, 50K and 100K Ω ■ Motor Controls and Feedback Systems ■ Available in PDIP, SOIC, TSSOP and MSOP packages ■ Programmable Analog Functions DESCRIPTION when power is returned. The wiper can be adjusted to test new system values without effecting the stored setting. Wiper-control of the CAT5112 is accomplished with three input control pins, CS, U/D, and INC. The INC input increments the wiper in the direction which is determined by the logic state of the U/D input. The CS input is used to select the device and also store the wiper position prior to power down. The CAT5112 is a single digitally programmable potentiometer (DPP™) designed as a electronic replacement for mechanical potentiometers and trim pots. Ideal for automated adjustments on high volume production lines, they are also well suited for applications where equipment requiring periodic adjustment is either difficult to access or located in a hazardous or remote environment. The CAT5112 contains a 32-tap series resistor array connected between two terminals RH and RL. An up/ down counter and decoder that are controlled by three input pins, determines which tap is connected to the wiper, RW. The CAT5112 wiper is buffered by an OP AMP that operates rail to rail. The wiper setting, stored in non-volatile NVRAM memory, is not lost when the device is powered down and is automatically recalled The digitally programmable potentiometer can be used as a three-terminal resistive divider or as a two-terminal variable resistor. DPPs bring variability and programmability to a wide variety of applications including control, parameter adjustments, and signal processing. FUNCTIONAL DIAGRAM VCC VH /R H RH U/D INC Control and Memory + – VW / R W R WB CS RL VL / R L Implementation of the Electronic Potentiometer VSS © 2001 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 25091-00 Rev. 3/28/01 M-1 CAT5112 Advance Information PIN CONFIGURATION PIN FUNCTIONS DIP/SOIC Package INC U/D RH GND VCC CS RL RW Pin Name TSSOP Package CS RL VCC RW GND RH INC U/D MSOP Package INC U/D RH GND VCC CS RL RW Function INC Increment Control U/D Up/Down Control RH Potentiometer High Terminal GND Ground RW Potentiometer Wiper Terminal RL Potentiometer Low Terminal CS Chip Select VCC Supply Voltage PIN DESCRIPTIONS INC INC: Increment Control Input of the CAT5112 and is active low. When in a high state, activity on the INC and U/D inputs will not affect or change the position of the wiper. The INC input moves the wiper in the up or down direction determined by the condition of the U/D input. U/D D: Up/Down Control Input DEVICE OPERATION The U/D input controls the direction of the wiper movement. When in a high state and CS is low, any highto-low transition on INC will cause the wiper to move one increment toward the RH terminal. When in a low state and CS is low, any high-to-low transition on INC will cause the wiper to move one increment towards the RL terminal. The CAT5112 operates like a digitally controlled potentiometer with RH and RL equivalent to the high and low terminals and RW equivalent to the mechanical potentiometer's wiper. There are 32 available tap positions including the resistor end points, RH and RL. There are 31 resistor elements connected in series between the RH and R L terminals. The wiper terminal is connected to one of the 32 taps and controlled by three inputs, INC, U/D and CS. These inputs control a five-bit up/down counter whose output is decoded to select the wiper position. The selected wiper position can be stored in nonvolatile memory using the INC and CS inputs. RH: High End Potentiometer Terminal RH is the high end terminal of the potentiometer. It is not required that this terminal be connected to a potential greater than the RL terminal. Voltage applied to the RH terminal cannot exceed the supply voltage, VCC or go below ground, GND. With CS set LOW the CAT5112 is selected and will respond to the U/D and INC inputs. HIGH to LOW transitions on INC wil increment or decrement the wiper (depending on the state of the U/D input and fivebit counter). The wiper, when at either fixed terminal, acts like its mechanical equivalent and does not move beyond the last position. The value of the counter is stored in nonvolatile memory whenever CS transitions HIGH while the INC input is also HIGH. When the CAT5112 is powered-down, the last stored wiper counter position is maintained in the nonvolatile memory. When power is restored, the contents of the memory are recalled and the counter is set to the value stored. RW: Wiper Potentiometer Terminal RW is the wiper terminal of the potentiometer. Its position on the resistor array is controlled by the control inputs, INC, U/D and CS. Voltage applied to the RW terminal cannot exceed the supply voltage, VCC or go below ground, GND. RL: Low End Potentiometer Terminal RL is the low end terminal of the potentiometer. It is not required that this terminal be connected to a potential less than the RH terminal. Voltage applied to the RL terminal cannot exceed the supply voltage, VCC or go below ground, GND. RL and RH are electrically interchangeable. With INC set low, the CAT5112 may be de-selected and powered down without storing the current wiper position in nonvolatile memory. This allows the system to always power up to a preset value stored in nonvolatile memory. CS CS: Chip Select The chip select input is used to activate the control input Doc. No. 25091-00 Rev. 3/01 M-1 2 CAT5112 Advance Information OPERATION MODES RH INC CS U/D Operation High to Low Low High W toward H High to Low Low Low W toward L High Low to High X Store Wiper Position Low Low to High X No Store, Return to Standby X High X Standby Supply Voltage VCC to GND ...................................... –0.5V to +7V Inputs CS to GND .............................–0.5V to VCC +0.5V INC to GND ............................–0.5V to VCC +0.5V U/D to GND ............................–0.5V to VCC +0.5V H to GND ................................–0.5V to VCC +0.5V L to GND ................................–0.5V to VCC +0.5V W to GND ............................... –0.5V to VCC +0.5V Parameter ESD Susceptibility Latch-Up Data Retention Endurance TDR NEND Min RW CW CL Max 2000 100 100 1,000,000 Units Test Method Volts mA Years Stores MIL-STD-883, Test Method 3015 JEDEC Standard 17 MIL-STD-883, Test Method 1008 MIL-STD-883, Test Method 1003 DC Electrical Characteristics: VCC = +2.5V to +6.0V unless otherwise specified Power Supply Symbol Parameter Conditions Min VCC ICC1 Operating Voltage Range Supply Current (Increment) CAT5114 ICC2 Supply Current (Write) ISB1 (2) Supply Current (Standby) CAT5114 Potentiometer Equivalent Circuit RL * Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Absolute Maximum Ratings are limited values applied individually while other parameters are within specified operating conditions, and functional operation at any of these conditions is NOT implied. Device performance and reliability may be impaired by exposure to absolute rating conditions for extended periods of time. RELIABILITY CHARACTERISTICS VZAP(1) ILTH(1)(2) Rwi Operating Ambient Temperature Commercial (‘C’ suffix) .................... 0°C to +70°C Industrial (‘I’ suffix) ...................... – 40°C to +85°C Junction Temperature ..................................... +150°C Storage Temperature ....................... –65°C to +150°C Lead Soldering (10 sec max) .......................... +300°C ABSOLUTE MAXIMUM RATINGS Symbol CH Typ Max Units V µA VCC = 6V, f = 1MHz, IW=0 VCC = 6V, f = 250KHz, IW=0 Programming, VCC = 6V VCC = 3V 2.5 — — — — — — — — — 6.0 100 50 1 500 mA µA CS=VCC-0.3V — — 1 µA U/D, INC=VCC-0.3V or GND Logic Inputs Symbol Parameter Conditions IIH IIL VIH1 VIL1 Input Leakage Current Input Leakage Current TTL High Level Input Voltage TTL Low Level Input Voltage VIH2 CMOS High Level Input Voltage VIL2 CMOS Low Level Input Voltage NOTES: (1) (2) (3) (4) Min Typ Max Units VIN = VCC VIN = 0V 4.5V ≤ VCC ≤ 5.5V — — 2 0 — — — — 10 –10 VCC 0.8 µA µA V V 2.5V ≤ VCC ≤ 6V VCC x 0.7 — VCC + 0.3 V -0.3 — VCC x 0.2 V This parameter is tested initially and after a design or process change that affects the parameter. Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to VCC + 1V IW=source or sink These parameters are periodically sampled and are not 100% tested. 3 Doc. No. 25091-00 Rev. 3/01 M-1 CAT5112 Advance Information Potentiometer Parameters Symbol RPOT Parameter Conditions Min Potentiometer Resistance Typ Max Units 10KΩ 20KΩ 50KΩ 100KΩ Pot Resistance Tolerance ±15 % VRH Voltage on RH pin OV VCC V VRL Voltage on RL pin OV VCC V Resolution 3.2 % INL Integral Linearity Error IW ≤ 2µA 0.5 1 LSB DNL Differential Linearity Error IW ≤ 2µA 0.25 .5 LSB RWi Wiper Resistance VCC = 5V, IW = 1mA 400 Ω VCC = 2.5V, IW = 1mA 1K Ω 1 mA IW Wiper Current TCRPOT TC of Pot Resistance ppm/oC TCRATIO Ratiometric TC ppm/oC RISO Isolation Resistance VN Noise CH/CL/CW Ω nV/√Hz Potentiometer Capacitances Doc. No. 25091-00 Rev. 3/01 M-1 10/10/25 4 pF CAT5112 Advance Information AC CONDITIONS OF TEST VCC Range 2.5V ≤ VCC ≤ 6V Input Pulse Levels 0.2VCC to 0.7VCC Input Rise and Fall Times 10ns Input Reference Levels 0.5VCC AC OPERATING CHARACTERISTICS: VCC = +2.5V to +6.0V, VH = VCC, VL = 0V, unless otherwise specified Symbol tCI tDI tID tIL tIH tIC tCPH tCPH tIW tCYC tR, tF(2) tPU(2) tR VCC(2) tWR Limits Parameter CS to INC Setup U/D to INC Setup U/D to INC Hold INC LOW Period INC HIGH Period INC Inactive to CS Inactive CS Deselect Time (NO STORE) CS Deselect Time (STORE) INC to VOUT Change INC Cycle Time INC Input Rise and Fall Time Power-up to Wiper Stable VCC Power-up Rate Store Cycle Min Typ(1) Max Units 100 50 100 250 250 1 100 10 — 1 — — 0.2 — — — — — — — — — 1 — — — — 5 — — — — — — — — 5 — 500 1 msec 50 10 ns ns ns ns ns µs ns ms µs µs µs msec V/ms ms A. C. TIMING CS (store) tCYC tCI tIL tIC tIH tCPH 90% INC 90% 10% tDI tID tF U/D tR MI (3) tIW W (1) Typical values are for TA=25oC and nominal supply voltage. (2) This parameter is periodically sampled and not 100% tested. (3) MI in the A.C. Timing diagram refers to the minimum incremental change in the W output due to a change in the wiper position. 5 Doc. No. 25091-00 Rev. 3/01 M-1 CAT5112 Advance Information ORDERING INFORMATION Prefix CAT Optional Company ID Device # 5112 Product Number 5112: Buffered 5114: Unbuffered Suffix S I Package P: PDIP S: SOIC U: TSSOP R: MSOP -10 Resistance -10: 10K Ohms -20: 20K Ohms -50: 50K Ohms -00: 100K Ohms TE13 Tape & Reel TE13: 2000/Reel Temperature Range Blank = Commercial (0°C to +70°C) I = Industrial (-40°C to +85°C) Notes: (1) The device used in the above example is a CAT5112 SI-10TE13 (SOIC, 10K Ohms, Industrial Temperature, Tape & Reel) Doc. No. 25091-00 Rev. 3/01 M-1 6