NEW CLAROCHIP Series CC9318 Nonvolatile Digital Trimming Potentiometer The CLAROCHIP CC9318 Digital Trimming Potentiometer is an 8-bit non- volatile DAC designed to replace mechanical trimmers. It includes a unity-gain amplifier to buffer the DAC output and enables V to swing OUT from rail to rail. The Digital Trimming Potentiometer operates over a supply voltage range of 2.7V to 5.5V. The simple up/down counter input provides an ideal interface for automatic test equipment to dither and monitor the V voltage. This interface allows for quick and consistent OUT calibration of even the most sophisticated systems. The CC9318 is a pin-compatible performance upgrade for other industry nonvolatile potentiometers. The adjustable CLAROCHIP CC9318 offers double the reso- lution of these devices and provides clickless transitions of V . OUT Features ......................................... Digitally Controlled Electronic Potentiometer Unity Gain Op Amp Drives up to 1mA Operation from +2.7V to +5.5V Supply 8-Bit Digital-to-Analog Converter (DAC) Simple Trimming Adjustment Low Power, 1mW max at +5V Independent Reference Inputs Up/Down Counter Style Operation No Mechanical Wearout Problem Differential Non-Linearity - 0.5LSB max Low Noise Operation 1,000,000 Stores (typical) Integral Non-Linearity - 1LSB max 100 Year Data Retention Make-Before-Break Contact for Clickless V Value in EEPROM for Power-On Recall OUT Fool-proof, Set-and-Forget Calibrations Transitions between DAC Steps Equivalent to 256-Step Potentiometer Functional Block Diagram .............................. V DD V H 2 8-bit E PROM - UP/DN AMP Counter V 8-bit OUT & INC 8-bit DAC Data + Write Register CS Control V L GND 2016 ILL2 1 NEW the Telephone: 800.874.1874 Fax: 800.223.5138 12055 Rojas Drive Suite K El Paso, Texas USA 79936 www.clarostat.comSymbol Description INC Increment Input, High to Low Edge Trigger INC 1 8 V DD UP/DN Up/Down Input controlling relative Vout movement V V+ reference input H UP/DN 2 7 CS GND Analog and Digital Ground V 3 6 V H L V Trimmed Voltage Output OUT V- reference input V L GND 4 5 V OUT CS Active low chip select input V Supply Voltage (2.7V to 5.5V) DD Analog Section voltage will either move toward VH or VL depending upon the state The CC9318 is an 8-bit, voltage output digital-to-analog converter of the UP/DN input. (DAC). The DAC consists of a resistor network that converts an 8-bit Up/Down (UP/DN) is an input that will determine the V move- OUT value into equivalent analog output voltages in proportion to the ment relative to V and V . When CS is low, UP/DN is high and H L applied reference voltage. there is a high to low transition on INC, the V voltage will move OUT Reference Inputs (1/256 th x V -V ) toward V When CS and UP/DN are low, and H L H. The voltage differential between the VL and VH inputs sets the full- there is a high to low transition on INC, the VOUT will move (1/256 scale output voltage range. V must be equal to or greater than th x V -V ) toward V . L H L L ground (i.e. a positive voltage). V must be greater than V and H L PowerUp/PowerDown Conditions less than or equal to V . See table on page 3 for guaranteed DD On powerup the CC9318 loads the value of EEPROM memory into operating limits. the wiper position register. The value in the register is changed Output Buffer Amplifier using the CS, INC, and UP/DN pins. The new data in the register The voltage output is a precision unity-gain follower that can slew will be lost at power-down unless CS was brought high, with INC up to 1V/s. high, to initiate a store operation after the last increment or decre- ment. On the next device powerup, the value of EEPROM memory Digital Interface will be loaded into the wiper position register. During power-up the The interface is designed to emulate a simple up/down counter, but CC9318 is write-protected in two ways: instead of a parallel count output, a ratiometric voltage output is provided. 1) A power-on reset, that trips at approximately 2.5V, holds CS and INC high internally. Chip Select (CS) is an active low input. Whenever CS is high the 2) Resistor pull-ups on all logic inputs prevent data change if the CC9318 is in standby mode and consumes the least power. This inputs are floating. mode is equivalent to a potentiometer that is adjusted to the required setting. When CS is low the CC9318 will recognize transi- Data Retention tions on the INC input and will move the V either toward the V OUT H The CC9318 is guaranteed to perform at least 1,000,000 writes to reference or toward the V reference depending upon the state of L EEPROM before a wearout condition can occur. After EEPROM the UP/DN input. wearout, the CC9318 continues to function as a volatile digital potentiometer. The host may exit an adjustment routine in two ways: deselecting the CC9318 while INC is low will not perform a store operation (a The wiper position can be changed during powered conditions using subsequent power cycle will recall the original data) deselecting the digital interface. However, on powerup the wiper position will the CC9318 while INC is high will store the current V setting OUT be indeterminate. into nonvolatile memory. On shipment from the factory, CLAROSTAT does not specify any EEP- Increment (INC) is an edge triggered input. Whenever CS is low ROM memory value. The value must be set by the customer and a high to low transition occurs on the INC input, the VOUT as needed. ABSOLUTE MAXIMUM RATINGS* *COMMENT Temperature Under Bias -55C to +125C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, Storage Temperature -65C to +150C and functional operation of the device at these or any other condi- Voltage on pins with reference to GND: tions outside those listed in the operation sections of this specifica- tion is not implied. Exposure to any absolute maximum rating for Analog Inputs -0.5V to V +.5V DD extended periods may affect device performance and reliability. Digital Inputs -0.5V to VDD+.5V Analog Outputs -0.5V to V +.5V DD Digital Outputs -0.5V to V +.5V DD Lead Solder Temperature (10 secs) 300C Page 2