s 32-position, linear-taper potentiometer s Low power CMOS technology s Single supply operation: 2.5V-5.5V s Increment up/down serial interface s Resistance values: 10k, 50k and 100k s Available in PDIP, SOIC, TSSOP and MSOP packagesAPPLICATIONS
s Automated product calibration s Remote control adjustments s Offset, gain and zero control s Tamper-proof calibrations
s Contrast, brightness and volume controls s Motor controls and feedback systems s Programmable analog functionsDESCRIPTION
The is a single digitally programmable potentiometer (DPPTM) 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 CAT5115 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 wiper is always set to the mid point, tap 15 at power up. The tap position is not stored in memory. Wiper-control of the CAT5115 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. The digitally programmable potentiometer can be used as a three-terminal resistive divider as a two-terminal variable resistor. DPPs bring variability and programmability to a wide variety of applications including control, parameter adjustments, and signal processing. For a pin-compatible device that recalls a stored tap position on power-up refer to the CAT5114 data sheet.UP/DOWN (U/D) INCREMENT (INC) DEVICE SELECT (CS)
2004 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Function Increment Control Up/Down Control Potentiometer High Terminal Ground Potentiometer Wiper Terminal Potentiometer Low Terminal Chip Select Supply Voltage
INC: Increment Control Input The INC input moves the wiper in the up or down direction determined by the condition of the U/D input. U/D: Up/Down Control Input 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. 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. 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. R L and R H are electrically interchangeable. CS: Chip Select The chip select input is used to activate the control input of the CAT5115 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 CAT5115 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 RL 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. With CS set LOW the CAT5115 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. When the CAT5115 is powereddown, the wiper position is reset. When power is restored, the counter is set to the mid point, tap 15.
OPERATION MODES INC High to Low High to Low X CS Low High U/D High Low X Operation Wiper toward H Wiper toward L Standby
ABSOLUTE MAXIMUM RATINGS Supply Voltage VCC to GND...................................... 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 H to GND................................ �0.5V to VCC L to GND................................ �0.5V to VCC W to GND............................... �0.5V to VCC +0.5V RELIABILITY CHARACTERISTICS Symbol
Operating Ambient Temperature Industrial (`I' suffix)...................... to +85�C Junction Temperature..................................... +150�C Storage Temperature....................... to +150�C Lead Soldering (10 sec max).......................... +300�C
* 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.
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 to +5.5V unless otherwise specified Power Supply Symbol Parameter Conditions Min
VCC ISB1 (2) Operating Voltage Range Supply Current (Increment) Supply Current (Write) Supply Current (Standby) VCC 1MHz, IW=0 VCC 250kHz, IW=0 Programming, VCC = 5.5V VCC 3V CS=VCC-0.3V U/D, INC=VCC-0.3V or GND 2.5
Input Leakage Current Input Leakage Current TTL High Level Input Voltage TTL Low Level Input Voltage CMOS High Level Input Voltage CMOS Low Level Input Voltage
This parameter is tested initially and after a design or process change that affects the parameter. Latch-up protection is provided for stresses 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.