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Número de pieza ZSSC3122
Descripción Low-Voltage Capacitive Sensor Signal Conditioner
Fabricantes IDT　
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No Preview Available ! ZSSC3122 Hoja de datos, Descripción, Manual

cLiteTM 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 sig-
nals. Digital compensation of sensor offset, sensiti-
vity, 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 sen-
sors with capacitances 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 calibration 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.
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%
Benefits
• Minimized calibration costs: no laser trimming,
one-pass calibration using a digital interface
• Excellent for low-power battery applications
Interfaces
• I²C™ or SPI interface—easy 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
Physical Characteristics
• 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
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: Digital Output, Alarms
VSUPPLY
(+1.8V to 5.5V)
0.1µF
0.1µF
GND
VDD
Vcore
VSS
C0
CC
cLite™
ZSSC3122
Ready
SDA/MISO
SCL/SCLK
SS
Alarm_High
Alarm_Low
* I2C™ is a registered trademark of NXP.
† See data sheet section 1.3 for restrictions.
© 2016 Integrated Device Technology, Inc.
1
January 25, 2016

1 page




ZSSC3122 pdf
ZSSC3122 Datasheet
Figure 3.4
Figure 3.5
Figure 3.6
Figure 3.7
Figure 3.8
Measurement Sequence in Update Mode ........................................................................................ 24
I2C™ and SPI Data Fetching in Update Mode ................................................................................. 26
Measurement Sequence in Sleep Mode (Only I2C™, SPI, or Alarms)............................................. 27
I2C™ and SPI Data Fetching in Sleep Mode .................................................................................... 28
I2C™ Timing Diagram ...................................................................................................................... 31
Figure 3.9 SPI Timing Diagram.......................................................................................................................... 32
Figure 3.10 I2C™ Measurement Packet Reads ................................................................................................... 34
Figure 3.11 SPI Output Packet with Positive Edge Sampling.............................................................................. 35
Figure 3.12 I2C MR............................................................................................................................................... 35
Figure 3.13 SPI MR.............................................................................................................................................. 36
Figure 3.14 Example of Alarm Function............................................................................................................... 39
Figure 3.15 Alarm Output Flow Chart .................................................................................................................. 39
Figure 4.1 I2C™ Command Format ................................................................................................................... 41
Figure 4.2 Command Mode Data Fetch............................................................................................................. 44
Figure 7.1 Digital Output with Optional Alarms Example................................................................................... 54
Figure 7.2 Analog Output with Optional Alarms Example.................................................................................. 55
Figure 7.3 Bang-Bang Control System Example ............................................................................................... 56
Figure 7.4 Differential Input Capacitance Example ........................................................................................... 57
Figure 7.5 Ext. Reference Input Capacitance Example..................................................................................... 58
Figure 9.1 ZSSC3122 Pin-Out Diagram ............................................................................................................ 59
List of Tables
Table 2.1
Table 3.1
Table 3.2
Table 3.3
Table 3.4
Table 3.5
Table 3.6
Table 3.7
Table 3.8
Table 3.9
Table 3.10
Table 3.11
Table 3.12
Table 4.1
Table 4.2
Table 4.3
Table 5.1
Table 5.2
Selection Settings for CREF, and COFF (Capacitance ranges are nominal values) ............................ 18
CDC Resolution and Conversion Times........................................................................................... 23
Update Rate Settings ....................................................................................................................... 24
Time Periods between Capacitance Measurements and Temperature Measurements for Different
Resolution and Update Rates........................................................................................................... 25
Status Table...................................................................................................................................... 29
Diagnostic Detection ......................................................................................................................... 29
Normal Operation Diagnostic Table ................................................................................................. 29
Output Modes ................................................................................................................................... 30
Pin Assignment for Output Selections .............................................................................................. 30
I2C™ Parameters.............................................................................................................................. 31
SPI Parameters................................................................................................................................. 32
I2C™ and SPI Command Types ....................................................................................................... 33
Low Pass Filter Example for R = 10kΩ............................................................................................. 37
Command List and Encodings.......................................................................................................... 42
Response Bits................................................................................................................................... 43
Command Diagnostic Bits ................................................................................................................ 43
EEPROM Word Assignments ........................................................................................................... 45
IDT_Config Bit Assignments............................................................................................................. 47
© 2016 Integrated Device Technology, Inc.
5
January 25, 2016

5 Page





ZSSC3122 arduino
ZSSC3122 Datasheet
1.4 Current Consumption Graphs
Part current consumption depends on a number of different factors including voltage, temperature, capacitive
input, resolution, and power down time. The best way to calculate the ZSSC3122’s power consumption is to
measure the current consumption with the actual setup. If measurement is not possible, then the graphs in this
section can provide a starting point for estimating the current consumption.
1.4.1 Update Mode Current Consumption
Figure 1.1 Best Case Settings (Typical Part)
Figure 1.2 Worst Case Settings (Typical Part)
* Parameter not within required temperature specifications (-40°C)
* Parameter not within required temperature specifications (-40°C)
1.4.2 Sleep Mode Current Consumption
Figure 1.3 Typical Current Consumption during Sleep Mode (No Measurements)
* Parameter not within required temperature specifications (-40°C)
© 2016 Integrated Device Technology, Inc.
11
January 25, 2016

11 Page







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