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ZSSC3122 Datasheet

Low-Voltage Capacitive Sensor Signal Conditioner

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cLite™ Low-Voltage Capacitive
Sensor Signal Conditioner
ZSSC3122
Datasheet
Brief Description
The ZSSC3122 is a CMOS integrated circuit for accurate
capacitance-to-digital conversion and sensor-specific correction of
capacitive sensor signals. Digital compensation 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 ZSSC3122 is configurable for capacitive sensors with capaci-
tances up to 10pF and a sensitivity of 125aF/LSB. 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 cali-
bration procedure to program a set of calibration coefficients into
an on-chip EEPROM. The calibrated ZSSC3122 and a specific
sensor are mated digitally: fast, precise, and without the cost
overhead of trimming by external devices or laser.
Available Support
ZSSC3122 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 Circuit:
Digital Output, Alarms
VSUPPLY
(+1.8V to 5.5V)
0.1µF
0.1µF
GND
VDD
Vc ore
VS S
C0
CC
cLite
ZSSC3122
Re ad y
SDA / MIS O
SCL / SCL K
SS
Al a rm _ Hi gh
Al a rm _L ow
Features
Maximum target input capacitance: 10pF
Sampling rates as fast as 0.7ms at 8-bit resolution;
1.6ms at 10-bit; 5.0ms at 12-bit; 18.5ms at14-bit
Digital compensation of sensor: piece-wise 1st and 2nd order
sensor compensation or up to 3rd order single-region sensor
compensation
Digital compensation of 1st and 2nd 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@ -20 to 125°C, 3V, 5V,
Vsupply ±10% (see data sheet section 1.3 for restrictions)
Minimized calibration costs: no laser trimming, one-pass
calibration using a digital interface
Excellent for low-power battery applications
Two interface options
I2C or SPI interfaceeasy connection to a microcontroller
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
Supply voltage: 1.8 to 5.5V
Typical current consumption 650μA down to 60μA depending
on configuration
Typical Sleep Mode current: ≤ 1μA at 85°C
Operation temperature: 20°C to +125°C
Die or TSSOP14 package
© 2018 Integrated Device Technology, Inc.
1
June 8, 2018


Renesas Electronics Components Datasheet

ZSSC3122 Datasheet

Low-Voltage Capacitive Sensor Signal Conditioner

No Preview Available !

ZSSC3122 Datasheet
Contents
1. Pin Assignments...........................................................................................................................................................................................6
2. Pin Descriptions............................................................................................................................................................................................6
3. Absolute Maximum Ratings..........................................................................................................................................................................7
4. Operating Conditions....................................................................................................................................................................................7
5. Electrical Characteristics ..............................................................................................................................................................................8
6. Current Consumption Graphs.....................................................................................................................................................................11
6.1 Update Mode Current Consumption ..................................................................................................................................................11
6.2 Sleep Mode Current Consumption ....................................................................................................................................................11
7. Output Pad Drive Strength .........................................................................................................................................................................12
8. Temperature Sensor Nonlinearity...............................................................................................................................................................13
9. Circuit Description ......................................................................................................................................................................................14
9.1 Signal Flow and Block Diagram.........................................................................................................................................................14
9.2 Analog Front-End ..............................................................................................................................................................................15
9.2.1 Capacitance-to-Digital Converter .......................................................................................................................................15
9.2.2 Temperature Measurement ................................................................................................................................................18
9.3 Digital Core........................................................................................................................................................................................19
10. Normal Operation Mode .............................................................................................................................................................................20
10.1 Power-On Sequence .........................................................................................................................................................................21
10.2 Measurement Cycle...........................................................................................................................................................................21
10.3 Measurement Modes.........................................................................................................................................................................22
10.3.1 Update Mode ......................................................................................................................................................................22
10.3.2 Sleep Mode ........................................................................................................................................................................25
10.4 Status and Diagnostics......................................................................................................................................................................26
10.4.1 EEPROM Error Detection and Correction ..........................................................................................................................27
10.4.2 Alarm Diagnostics...............................................................................................................................................................27
10.5 Output Modes ....................................................................................................................................................................................28
10.6 I2C and SPI .......................................................................................................................................................................................28
10.6.1 I2C Features and Timing ....................................................................................................................................................28
10.6.2 SPI Features and Timing....................................................................................................................................................30
10.6.3 I2C and SPI Commands.....................................................................................................................................................30
10.6.4 Data Fetch (DF)..................................................................................................................................................................31
10.6.5 Measurement Request (MR) ..............................................................................................................................................32
10.6.6 Ready Pin ...........................................................................................................................................................................33
10.7 PDM (Pulse Density Modulation).......................................................................................................................................................33
10.8 Alarm Output .....................................................................................................................................................................................34
10.8.1 Alarm Registers ..................................................................................................................................................................35
10.8.2 Alarm Operation .................................................................................................................................................................35
10.8.3 Alarm Output Configuration ................................................................................................................................................36
10.8.4 Alarm Polarity .....................................................................................................................................................................36
© 2018 Integrated Device Technology, Inc.
2
June 8, 2018



Part Number ZSSC3122
Description Low-Voltage Capacitive Sensor Signal Conditioner
Maker Renesas
Total Page 3 Pages
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