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ZSSC3135BE2T Datasheet(PDF) 11 Page - Integrated Device Technology

Part # ZSSC3135BE2T
Description  Sensor Signal Conditioner for Piezoresistive Bridge Sensors
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

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ZSSC3135 Datasheet
© 2016 Integrated Device Technology, Inc.
11
January 27, 2016
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
Maximum Span
VIN_SP [mV/V]
1)
Input Common Mode Range
VIN_CM [% VDDA]
105
7.1
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.


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