Signal Conditioner. ZSSC3123 Datasheet

ZSSC3123 Conditioner. Datasheet pdf. Equivalent

ZSSC3123 Datasheet
Recommendation ZSSC3123 Datasheet
Part ZSSC3123
Description Capacitive Sensor Signal Conditioner
Feature ZSSC3123; cLiteTM Capacitive Sensor Signal Conditioner ZSSC3123 Datasheet Brief Description The ZSSC3123 is .
Manufacture IDT
Datasheet
Download ZSSC3123 Datasheet




IDT ZSSC3123
cLite™ Capacitive Sensor Signal Conditioner
ZSSC3123
Datasheet
Description
The ZSSC3123 is a CMOS integrated circuit for accurate capaci-
tance-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 cali-
bration coefficients stored in a non-volatile EEPROM.
The ZSSC3123 is configurable for capacitive sensors with capaci-
tances up to 260pF and a sensitivity of 125aF/LSB to 1pF/LSB
depending on resolution, speed, and range settings. It is com-
patible 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, pulse density
modulation (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 ZSSC3123 and a specific
sensor are mated digitally: fast, precise, and without the cost
overhead of trimming by external devices or laser.
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
VSUPPLY
(2.3V to 5.5V)
0.1µF
0.1µF
GND
VDD
Vcore
VSS
C0
CC
cLite
ZSSC3123
Re ady
SDA/MIS O
SC L/SC LK
SS
Alarm_High
Alarm_Low
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 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 at -40°C to 125°C, 3V, 5V,
Vsupply ±10% (see data sheet section 5 for restrictions)
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
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: 2.3V to 5.5V
Typical current consumption 750μA down to 60μA depending
on configuration
Typical Sleep Mode current: ≤ 1μA at 85°C
Operation temperature: 40°C to +125°C depending on part
code
Die or 4.4 5.0 mm 14-TSSOP package
© 2018 Integrated Device Technology, Inc.
1
August 16, 2018



IDT ZSSC3123
ZSSC3123 Datasheet
Block Diagram
VDD (2.3V to 5.5V)
Vcore
0.1µF
0.1µF
Sensor C0
C0 CC
C1 C1
(Optional)
VSS
ZSSC3123 cLite Capacitive Sensor Signal Conditioner
Temp
Sensor
Ref Offset
Cap Cap
EEPROM
CLK/Reset
C/A
D
CDC
MUX
Analog Core
DSP
ROM
Digital Core
Ready
PDM
I2C / SPI
Low Alarm
High Alarm
Output
Communication
SCL/SCLK
SDA/MISO
Ready/PDM_C
Alarm_Low/PDM_T
SS
Alarm_High
Application: Analog Output
0.1µF 0.1µF
GND
VDD
Vcore
VSS
C0
cLite
ZSSC3123
PDM_C
PDM_T
CC Alar m_High
VSUPPLY
(+2.3V to 5.5V)
Cap.
Analog
Output
Temp
Analog
Output
LED
Application: Differential Capacitance Input
VSUPPLY
(+2.3V to 5.5V)
0.1µF
0.1µF
GND
VDD
Vcore
VSS
C0
CC
C1
cLite
ZSSC3123
Ready
SDA/MIS O
SCL/SCLK
SS
Alar m_High
Alar m_Low
© 2018 Integrated Device Technology, Inc.
2
August 16, 2018



IDT ZSSC3123
ZSSC3123 Datasheet
Contents
1. Pin Assignments...........................................................................................................................................................................................7
2. Pin Descriptions............................................................................................................................................................................................7
3. Absolute Maximum Ratings..........................................................................................................................................................................8
4. Recommended Operating Conditions ..........................................................................................................................................................9
5. Electrical Characteristics ............................................................................................................................................................................10
6. Current Consumption Graphs.....................................................................................................................................................................12
6.1 Update Mode Current Consumption..................................................................................................................................................12
6.2 Sleep Mode Current Consumption ....................................................................................................................................................13
7. Output Pad Drive Strength .........................................................................................................................................................................14
8. Temperature Sensor Nonlinearity...............................................................................................................................................................15
9. Circuit Description ......................................................................................................................................................................................16
9.1 Signal Flow and Block Diagram.........................................................................................................................................................16
9.2 Analog Front End...............................................................................................................................................................................16
9.2.1 Capacitance-to-Digital Converter .......................................................................................................................................16
9.2.2 Temperature Measurement ................................................................................................................................................22
9.3 Digital Core........................................................................................................................................................................................23
10. Normal Operation Mode .............................................................................................................................................................................24
10.1 Power-On Sequence .........................................................................................................................................................................25
10.2 Measurement Cycle...........................................................................................................................................................................26
10.3 Measurement Modes.........................................................................................................................................................................27
10.3.1 Update Mode ......................................................................................................................................................................27
10.3.2 Sleep Mode ........................................................................................................................................................................30
10.4 Status and Diagnostics......................................................................................................................................................................32
10.4.1 EEPROM Error Detection and Correction ..........................................................................................................................33
10.4.2 Alarm Diagnostics...............................................................................................................................................................33
10.5 Output Modes ....................................................................................................................................................................................33
10.6 I2C and SPI .......................................................................................................................................................................................34
10.6.1 I2C Features and Timing ....................................................................................................................................................34
10.6.2 SPI Features and Timing....................................................................................................................................................35
10.6.3 I2C and SPI Commands.....................................................................................................................................................35
10.6.4 Data Fetch (DF)..................................................................................................................................................................36
10.6.5 Measurement Request (MR) ..............................................................................................................................................37
10.6.6 Ready Pin ...........................................................................................................................................................................38
10.7 Pulse Density Modulation (PDM).......................................................................................................................................................38
10.8 Alarm Output .....................................................................................................................................................................................39
10.8.1 Alarm Registers ..................................................................................................................................................................40
10.8.2 Alarm Operation .................................................................................................................................................................40
10.8.3 Alarm Output Configuration ................................................................................................................................................41
© 2018 Integrated Device Technology, Inc.
3
August 16, 2018







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