NEW CLAROCHIP Series CC9317 Nonvolatile Digital Trimming Potentiometer The CLAROCHIP CC9317 digital trimmer is a 7-bit nonvolatile DAC designed to replace mechanical trimmers. It includes a unity-gain amplifier to buffer the DAC output and enables V to swing from OUT rail to rail. The trimmer operates over a supply voltage range of 2.7V to 5.5V. Its simple up/down counter input provides an ideal interface for automatic test equipment to dither and monitor the V voltage. OUT This interface allows for quick and consistent calibration of even the most sophisticated systems. The CLAROCHIP CC9317 is a pin-compatible performance upgrade for other industry nonvolatile potentiometers. It offers higher resolution than these devices and provides clickless transitions of VOUT. Features ......................................... Digitally Controlled Electronic Potentiometer Unity Gain Op Amp Drives up to 1mA No Mechanical Wearout Problem 1,000,000 Stores (typical) 7-Bit Digital-to-Analog Converter (DAC) Low Power, 1mW max at +5V 100 Year Data Retention Independent Reference Inputs Simple Trimming Adjustment Differential Non-Linearity 0.5LSB Operation from +2.7V to +5.5V Supply Up/Down Counter Style Operation Integral Non-Linearity 1LSB Fool-proof, Set-and-Forget Calibrations Low Noise Operation V Value in EEPROM for Power-On Recall OUT Make-Before-Break Contact for Clickless Equivalent to 128-Step Potentiometer Transitions between DAC Steps Functional Block Diagram .............................. V DD V H 2 7-bit E PROM - UP/DN AMP Counter V 7-bit OUT & INC 7-bit DAC Data + Write Register CS Control V L GND 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 V Trimmed Voltage Output H L OUT V V- reference input 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 V or V depending upon the state H L The CC9317 is a 7-bit, voltage output digital-to-analog converter of the UP/DN input. (DAC). The DAC consists of a resistor network that converts a 7-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 (1/128 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 scale output voltage range. V must be equal to or greater than (1/128 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 CC9317 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 from a precision unity-gain follower that can will be lost at power-down unless CS was brought high, with INC slew 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 CC9317 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 CC9317 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 CC9317 will recognize transi- Data Retention tions on the INC input and will move the V either toward the V The CC9317 is guaranteed to perform at least 1,000,000 writes to OUT H reference or toward the V reference depending upon the state of EEPROM before a wearout condition can occur. After EEPROM L the UP/DN input. wearout, the CC9317 continues to function as a volatile digital potentiometer. The host may exit an adjustment routine in two ways: deselecting the CC9317 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 CC9317 while INC is high will store the current VOUT setting into be indeterminate. non-volatile memory. On shipment from the factory, CLAROSTAT does not specify any EEPROM Increment (INC) is an edge triggered input. Whenever CS is low 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 Stresses above those listed under Absolute Maximum Ratings may Temperature Under Bias -55C to +125C cause permanent damage to the device. These are stress ratings Storage Temperature -65C to +150C only, and functional operation of the device at these or any other conditions outside those listed in the operation sections of this Voltage on pins with reference to GND: specification is not implied. Analog Inputs -0.5V to V +.5V DD Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. Digital Inputs -0.5V to V +.5V DD Analog Outputs -0.5V to VDD+.5V Digital Outputs -0.5V to V +.5V DD Lead Solder Temperature (10 secs) 300C Page 2