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PDF ZSSC3138 Data sheet ( Hoja de datos )
| Número de pieza | ZSSC3138 | |
| Descripción | Sensor Signal Conditioner | |
| Fabricantes | IDT | |
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Sensor Signal Conditioner for
Ceramic Sensor Applications
ZSSC3138
Datasheet
Brief Description
The ZSSC3138 is a member of the ZSSC313x
product family of CMOS integrated circuits designed
for automotive/ industrial sensor applications. All
family members are well suited for highly accurate
amplification 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 on chip
(EEPROM).
The ZSSC3138 offers a maximum analog gain of
420 and two offset compensation features. These fit
perfectly with the requirements of ceramic thick-film-
based sensor elements as well as strain gauges.
The high amplification in combination with the offset
compensation offers the capability to set up ceramic
thick-film-based sensor applications without laser
trimming, which leads to better long-term stability.
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 ZACwire™
interface: simple, cost efficient, quick, and precise
• 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
Features
• Adjustable to nearly all resistive bridge sensor
types, analog gain of 420, maximum overall gain
of 1680
• Enhanced sample rate: 7.8 kHz maximum
• High ADC resolution 15/16 bit
• Safety functionality sensor connection
• Internal temperature compensation
• 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
ZACwireTM (digital One-Wire Interface (OWI))
• Sensor biasing by voltage
• High voltage protection up to 33 V
• Supply current: 5.5mA maximum
• Reverse polarity and short circuit protection
• Wide operation temperature range between
-40 to +150°C
• Traceability by user-defined EEPROM entries
* Note: I2C™ is a trademark of NXP.
** FSO = Full Scale Output.
© 2016 Integrated Device Technology, Inc.
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
ZSSC3138 Minimum Application Requirements
Sensor
Module
VCC
ZSSC3138
OUT
GND
1 January 25, 2016
1 page  
ZSSC3138 Datasheet
1 Electrical Characteristics
1.1. 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
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
-55
1) Refer to the ZSSC313x High Voltage Protection Description for specification and detailed conditions.
Max Unit
33 VDC
33 VDC
6.5 VDC
VDDA + 0.3 VDC
150 °C
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 Dice Package Document.
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 ZSSC3138 are required.
Unsymmetrical conditions of the sensor and/or external components connected to the sensor input pins of the ZSSC3138 can generate a failure in
signal operation.
© 2016 Integrated Device Technology, Inc.
5
January 25, 2016
5 Page 
ZSSC3138 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.
Extended analog offset compensation (XZC): If required, this compensates large sensor offsets; e.g., if
the sensor offset voltage is near to or larger than the sensor span.
Resolution/response time: The A/D converter must be configured for resolution. The ADC order (first or
second order) must also be configured. These settings influence the sampling rate and the signal
integration time, and thus, the noise immunity.
• Temperature
Temperature measurement
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).
© 2016 Integrated Device Technology, Inc.
11
January 25, 2016
11 Page | ||
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