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PDF ZSSC3135 Data sheet ( Hoja de datos )
| Número de pieza | ZSSC3135 | |
| Descripción | Sensor Signal Conditioner | |
| Fabricantes | IDT | |
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Sensor Signal Conditioner for
Piezoresistive Bridge Sensors
ZSSC3135
Datasheet
Brief Description
The ZSSC3135 is a member of the ZSSC313x
family of CMOS integrated circuits designed for
automotive/industrial sensor applications. All family
members are well suited for highly accurate amp-
lification and sensor-specific correction of resistive
bridge sensor signals. An internal 16-bit RISC
microcontroller running a correction algorithm
compensates sensor offset, sensitivity, temperature
drift, and non-linearity of the connected sensor
element. The required calibration coefficients are
stored by the one-pass calibration procedure in an
on-chip EEPROM.
The ZSSC3135 is specially designed for piezo-
resistive bridge sensor elements. The amplification
stage with an analog gain of 105 in combination with
optional temperature compensation via an external
temperature sensor meets or exceeds the require-
ments of piezoresistive sensor applications.
Features
• Adjustable to nearly all resistive bridge sensor
types: analog gain of up to 105, maximum overall
gain of 420
• Sample rate up to 200 Hz
• ADC resolution 13/14 bit
• Safety functionality sensor connection
• External temperature sensor
• Digital compensation of sensor offset, sensitivity,
temperature drift, and non-linearity
• Output options: ratiometric analog voltage output
(5 - 95% maximum, 12.4 bit resolution) or
ZACwire™ (digital One-Wire Interface (OWI))
• Sensor biasing by voltage
• High voltage protection up to 33 V
• Supply current: max. 5.5mA
• Reverse polarity and short circuit protection
• Wide operation temperature range:
-40 to +150°C
• Traceability by user-defined EEPROM entries
* Note: I2C™ is a trademark of NXP.
** FSO = Full Scale Output.
Benefits
• Family approach offers the best fitting IC selec-
tion to build cost-optimized applications
• No external trimming components required
• Low number of external components needed
• PC-controlled configuration and one-pass/
end-of-line calibration via I²C™* or ZACwireTM
interface: simple, cost-efficient, quick, and pre-
cise
• High accuracy: 0.25% FSO** @ -25 to +85°C;
0.5% FSO @ -40 to +125°C
• Optimized for automotive/industrial environments
due to robust protection circuitries, excellent
electromagnetic compatibility and AEC-Q100
qualification
Available Support
• Evaluation Kits
• Application Notes
• Mass Calibration System
Physical Characteristics
• Supply voltage: 4.5 to 5.5 V
• Operation temperature: -40°C to +125°C
(-40°C to +150°C extended temperature range
depending on product version)
• Available in RoHS-compliant JEDEC-SSOP14
package or delivery as die
ZSSC3135 Minimum Application Requirements
Sensor
Module
VCC
ZSSC3135
OUT
GND
© 2016 Integrated Device Technology, Inc.
1
January 27, 2016
1 page  
ZSSC3135 Datasheet
1 Electrical Characteristics
1.1. Absolute Maximum Ratings
Note: The absolute maximum ratings are stress ratings only. The device might not function or be operable above
the operating conditions given in section 1.2. Stresses exceeding the absolute maximum ratings might also
damage the device. In addition, extended exposure to stresses above the recommended operating conditions
might affect device reliability. IDT does not recommend designing to the “Absolute Maximum Ratings.”
Parameters apply in operation temperature range and without time limitations.
Table 1.1 Absolute Maximum Ratings
No.
1.1.1
Parameter
Supply voltage 1)
1.1.2
1.1.3
Potential at AOUT pin 1)
Analog supply voltage 1)
Symbol
VDDEAMR
VOUT
VDDAAMR
Conditions
To VSSE, refer to
section 3 for application
circuits
Referenced to VSSE
Referenced to VSSA,
VDDE - VDDA < 0.35V
Min
-33
-33
-0.3
Max Unit
33 VDC
33 VDC
6.5 VDC
1.1.4
1.1.5
Voltage at all analog and
digital IO pins
Storage temperature
VA_IO
VD_IO
TSTG
Referenced to VSSA
-0.3 VDDA + 0.3 VDC
-55 150 °C
1) Refer to the ZSSC313x High Voltage Protection Description for specification and detailed conditions.
1.2. Operating Conditions
All voltages are referenced to VSSA.
Table 1.2 Operating Conditions
No.
1.2.1
Parameter
Ambient temperature 1) 2)
Symbol
TAMB_TQE
Conditions
Extended Temperature
Range (TQE)
Min Typ Max Unit
-40 150 °C
TAMB_TQA
Advanced-Performance
Temperature Range
(TQA)
-40
125 °C
TAMB_TQI
Best-Performance
Temperature Range (TQI)
-25
85 °C
1.2.2
1.2.3
Supply voltage
Bridge resistance 3) 4)
VDDE
RBR
4.5 5.0 5.5 VDC
2 25 kΩ
1) Maximum operation temperature range depends on product version (refer to section 8).
2) See the temperature profile description in the ZSSC313x Technical Note—Die & Package Dimensions.
3) No measurement in mass production; parameter is guaranteed by design and/or quality observation.
4) Symmetric behavior and identical electrical properties (especially the low pass characteristic) of both sensor inputs of the ZSSC3135 are required.
Unsymmetrical conditions of the sensor and/or external components connected to the sensor input pins of the ZSSC3135 can generate a failure in
signal operation.
© 2016 Integrated Device Technology, Inc.
5
January 27, 2016
5 Page 
ZSSC3135 Datasheet
The digital signal conditioning is processed by the calibration microcontroller (CMC). It is based on a correction
formula that uses sensor-specific coefficients determined during calibration. The formula is located in ROM, and
the sensor-specific coefficients are stored in EEPROM. Depending on the programmed output configuration, the
conditioned sensor signal is output as an analog signal or alternatively can be readout via a digital serial interface
(I²C™ or ZACwire™). The configuration data and the correction parameters must also be programmed into the
EEPROM via the digital interfaces.
2.2. Application Modes
For each application, a configuration set must be established by programming the on-chip EEPROM for the
following modes:
• Sensor channel
Input range: The gain adjustment of the analog front-end (AFE) with respect to the maximum sensor
signal span and the zero point of the A/D conversion must be selected.
Resolution/response time: The A/D converter must be configured for resolution. These settings influence
the sampling rate and the signal integration time, and thus, the noise immunity.
• Temperature
Temperature measurement: Select the internal or external temperature sensor.
2.3. Analog Front-End (AFE)
The analog front-end (AFE) consists of the three-stage programmable gain amplifier (PGA), the multiplexer
(MUX), and the analog-to-digital converter (ADC).
2.3.1. Programmable Gain Amplifier (PGA)
Table 2.1 shows the adjustable gains, the sensor signal spans, and the valid common mode range.
Table 2.1 Adjustable Gains, Resulting Sensor Signal Spans and Common Mode Ranges
PGA Gain
aIN
105
Maximum Span
VIN_SP [mV/V] 1)
7.1
Input Common Mode Range
VIN_CM [% VDDA]
29 to 65
70
10.7
29 to 65
52.5 14.3 29 to 65
35
21.4
29 to 65
26.3 28.5 29 to 65
14
53.75
29 to 65
9.3 80 29 to 65
7 107 29 to 65
2.8 267 32 to 57
1) Recommended maximum internal signal range is 75% of the supply voltage.
Span is calculated by the following formula: Span = 0.75 (VBR_T – VBR_B) / Gain.
© 2016 Integrated Device Technology, Inc.
11
January 27, 2016
11 Page | ||
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