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PDF ZSSC3123 Data sheet ( Hoja de datos )
| Número de pieza | ZSSC3123 | |
| Descripción | Capacitive Sensor Signal Conditioner | |
| Fabricantes | IDT | |
| Logotipo |  |
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cLiteTM 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 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@ -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
VSUPPLY
(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
1 page  
ZSSC3123 Datasheet
Figure 1.7 Second Order Fit (Typical Part) ...........................................................................................................13
Figure 2.1 ZSSC3123 Block Diagram...................................................................................................................14
Figure 3.1 General Operation ...............................................................................................................................22
Figure 3.2 Power-On Sequence with Fast Startup Bit Set in EEPROM ...............................................................23
Figure 3.3 Measurement Cycle Timing ................................................................................................................24
Figure 3.4
Figure 3.5
Figure 3.6
Figure 3.7
Figure 3.8
Measurement Sequence in Update Mode ...........................................................................................25
I2C™ and SPI Data Fetching in Update Mode ....................................................................................27
Measurement Sequence in Sleep Mode (Only I2C™, SPI, or Alarms)................................................28
I2C™ and SPI Data Fetching in Sleep Mode .......................................................................................29
I2C™ Timing Diagram .........................................................................................................................32
Figure 3.9 SPI Timing Diagram.............................................................................................................................33
Figure 3.10 I2C™ Measurement Packet Reads ......................................................................................................34
Figure 3.11 SPI Output Packet with Positive Edge Sampling.................................................................................35
Figure 3.12 I2C™ MR ..............................................................................................................................................36
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 ZSSC3123 Pin-Out Diagram ...............................................................................................................59
List of Tables
Table 2.1
Table 2.2
Table 3.1
Table 3.2
Table 3.3
Table 3.4
Table 3.5
Table 3.6
Table 3.7
Table 3.8
CDC Multiplier......................................................................................................................................17
Selection Settings for CREF, and COFF, and Mult (Capacitance ranges are nominal values) ...............18
CDC Resolution and Conversion Times..............................................................................................24
Update Rate Settings ..........................................................................................................................25
Time Periods between Capacitance Measurements and Temperature Measurements for Different
Mult, Resolution and Update Rates .....................................................................................................26
Status Table.........................................................................................................................................30
Diagnostic Detection ............................................................................................................................30
Normal Operation Diagnostic Table ....................................................................................................30
Output Modes ......................................................................................................................................31
Pin Assignment for Output Selections .................................................................................................31
© 2016 Integrated Device Technology, Inc.
5
January 26, 2016
5 Page 
ZSSC3123 Datasheet
1.4 Current Consumption Graphs
Part current consumption depends on a number of different factors including voltage, temperature, capacitive input, Mult,
resolution, and power down time. The best way to calculate the ZSSC3123’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)
1.4.2 Sleep Mode Current Consumption
Figure 1.3 Typical Current Consumption during Sleep Mode (No Measurements)
© 2016 Integrated Device Technology, Inc.
11
January 26, 2016
11 Page | ||
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