ZSSC3123 Datasheet, PDF (1/63 Pages) List of Unclassifed Manufacturers – Capacitive Sensor Signal Conditioner

cLite^TM Capacitive Sensor
Signal Conditioner
ZSSC3123
Datasheet
Brief Description
The ZSSC3123 is a CMOS integrated circuit for accurate
capacitance-to-digital conversion and sensor-specific
correction of capacitive sensor signals. Digital compen-
sation of sensor offset, sensitivity, and temperature drift is
accomplished via an internal digital signal processor
running a correction algorithm with calibration coefficients
stored in a non-volatile EEPROM.
The ZSSC3123 is configurable for capacitive sensors with
capacitances up to 260pF and a sensitivity of 125aF/LSB
to 1pF/LSB depending on resolution, speed, and range
settings. It is compatible with both single capacitive
sensors (both terminals must be accessible) and
differential capacitive sensors. Measured and corrected
sensor values can be output as I²C™*, SPI, PDM, or
alarms.
The I²C™ interface can be used for a simple PC-controlled
calibration procedure to program a set of calibration
coefficients into an on-chip EEPROM. The calibrated
ZSSC3123 and a specific sensor are mated digitally: fast,
precise, and without the cost overhead of trimming by
external devices or laser.
Features
• Maximum target input capacitance: 260pF
• Sampling rates as fast as 0.7ms at 8-bit resolution;
1.6ms at 10-bit; 5.0ms at 12-bit; 18.5ms at 14-bit
• Digital compensation of sensor: piece-wise 1^st and 2^nd
order sensor compensation or up to 3^rd order single-
region sensor compensation
• Digital compensation of 1^st and 2^nd order temperature
gain and offset drift
• 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 125°C, 3V, 5V, Vsupply ±10%
* I²C™ is a registered trademark of NXP.
† See data sheet section 1.3 for restrictions.
Benefits
• Minimized calibration costs: no laser trimming, one-
pass calibration using a digital interface
• Wide capacitance range to support a broad portfolio of
different sensor elements
• Excellent for low-power battery applications
Interfaces
• I²C™ or SPI interface—easy connection to a µC
• PDM outputs (Filtered Analog Ratiometric) for both
capacitance and temperature
• Up to two alarms that can act as full push-pull or open-
drain switches
Physical Characteristics
• Supply voltage: 2.3V to 5.5V
• Typical current consumption 650μA down to 60μA
depending on configuration
• Typical Sleep Mode current: ≤ 1μA at 85°C
• Operation temperature: –40°C to +125°C
• Die or TSSOP14 package
Available Support
• ZSSC3123 SSC Evaluation Kit available: SSC
Evaluation Board, samples, software, documentation.
• Support for industrial mass calibration available.
• Quick circuit customization option for large production
volumes.
Application: Digital Output, Alarms
V_SUPPLY
(2.3V to 5.5V)
0.1µF
0.1µF
GND
VDD
Vcore
VSS
C0
CC
cLite^™
ZSSC3123
Ready
SDA/MISO
SCL/SCLK
SS
Alarm_High
Alarm_Low
© 2016 Integrated Device Technology, Inc.
1
January 26, 2016