Data Sheet Rev. 1.20/ August 2011 ZSSC3122 cLite Low Voltage Capacitive Sensor Signal Conditioner ZSSC3122 cLite Low Voltage Capacitive Sensor Signal Conditioner Brief Description Benefits The ZSSC3122 cLite is a CMOS integrated circuit Minimized calibration costs: no laser trimming, for accurate capacitance-to-digital conversion and one-pass calibration using a digital interface sensor-specific correction of capacitive sensor sig- Excellent for low-power battery applications nals. Digital compensation of sensor offset, sensiti- vity and temperature drift is accomplished via an Interfaces internal digital signal processor running a correction algorithm with calibration coefficients stored in a IC or SPI interfaceeasy connection to a C non-volatile EEPROM. PDM outputs (Filtered Analog Ratiometric) for The ZSSC3122 is configurable for capacitive sen- both capacitance and temperature sors with capacitances up to 10pF and a sensitivity Up to two alarms that can act as full push-pull or of 125aF/LSB. It is compatible with both single capa- open-drain switches citive sensors (both terminals must be accessible) and differential capacitive sensors. Measured and 2 * corrected sensor values can be output as I C , Physical Characteristics SPI, PDM, or alarms. Supply voltage: 1.8 to 5.5V 2 The I C interface can be used for a simple PC- Typical current consumption 650 A down to controlled calibration procedure to program a set of 60 A depending on configuration calibration coefficients into an on-chip EEPROM. Typical Sleep Mode current: 1 A at 85C The calibrated ZSSC3122 and a specific sensor are mated digitally: fast, precise, and without the cost Operation temperature: 40C to +125C overhead of trimming by external devices or laser. Die or TSSOP14 package Features Available Support Maximum target input capacitance: 10pF ZSSC3122 SSC Evaluation Kit available: SSC Sampling rates as fast as 0.7ms 8-bit 1.6ms Evaluation Board, samples, software, 10-bit 5.0ms 12-bit 18.5ms 14-bit st documentation. Digital compensation of sensor: piece-wise 1 nd Support for industrial mass calibration available. order sensor compensation or up to and 2 rd 3 order single-region sensor compensation Quick circuit customization option for large st nd production volumes. Digital compensation of 1 and 2 order temperature gain and offset drift Application: Digital Output, Alarms Internal temperature compensation reference (no external components) Programmable capacitance span and offset Layout customized for die-die bonding with sensor for low-cost, high-density chip-on-board assembly Accuracy as high as 0.25% FSO -40 to 125C, 3V, 5V, Vsupply 10% * 2 I C is a registered trademark of NXP. See data sheet section 1.3 for restrictions. 2011 Zentrum Mikroelektronik Dresden AG Rev. 1.20 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.