Datasheet
ZSSC3281
Advanced Dual Channel ARM based Resistive Sensor Signal Conditioner IC
The ZSSC3281 is a dual path sensor signal
conditioning IC (SSC) for highly accurate
Features
•
Digital communication and calibration interfaces:
SPI up to 10MHz
I2C (Standard, Fast, Fast+) and I3C SDR
One-wire-interface (OWI), up to 100kBit/s
Accommodates nearly all resistive bridge sensor
types (signal spans from 1mV/V up to 500mV/V)
amplification, digitization, and sensor-specific
correction of sensor signals. The ZSSC3281 is
suitable for bridge and half-bridge sensors, as well as
external voltage-source element and single-element
sensors (for example, Pt100 and external temper-
ature sensor diodes) powered by an on-chip current
source. Digital compensation of the sensor offset,
sensitivity, temperature drift, and non-linearity is
accomplished via a 32-bit ARM M3 based math core
running a correction algorithm with calibration
coefficients stored in a non-volatile, reprogrammable
memory. The programmable, integrated sensor front-
end allows optimally applying various sensors for a
broad range of applications.
o
o
o
•
•
Supports
different
sensor
element
configurations:
o
o
o
Resistive bridge or half-bridge
Resistive divider string
Voltage source
•
•
On-chip temperature sensor
External temperature sensing supported, for
example, sensor-bridge as temperature detector,
external diode, etc.
Programmable 16-bit digital-to-analog-converter
and output (supporting “True-0Volt”-output):
(0V to 1V) or (0V to 5V) absolute voltage
output
•
The ZSSC3281 provides measurement value
readouts and programming capabilities via an I2C,
SPI, or one-wire interface (OWI). Absolute and
ratiometric voltage, current-loop, or interrupt outputs
are supported by the ZSSC3281.
o
o
o
o
VDD-ratiometric voltage output
4mA to 20mA current-loop output supported
0V to 10V absolute-voltage output supported
Wide operational temperature and supply range
On-chip voltage regulators for sensor supply,
and IC operation
Support for extra regulation by external
transistor, for example, JFET (especially for
industrial supply voltages >5.5VDC)
Programmable sensor-signal-conditioning math
core
•
•
Applications
• Calibrated, continuously operating sensors with
digital interface and/or analog output: (absolute or
ratiometric) voltage or current loop output
• Enables smart, digital sensors for energy-efficient
solutions
• (Dual/Diff.) pressure, flow and level sensing
• Industrial applications; for example,
process/factory automation
•
•
•
•
Reprogrammable, nonvolatile memory (NVM)
On-chip diagnostics:
• Consumer / white goods, for example, HVAC,
weight scales
o Sensor connection
o AFE self-test
• Medical applications, for example, blood
pressure, continuous smart health monitors
o Memory integrity
TOP1, TOP2
Text1
VDD
VDDD
Voltage Regulator
DAC
Power Ctr.
Bias
Current
Generator
VSS,VSSD
AGND / Guard
CM Generator
Temperature
Reference
Sensor
Text2
Text3
AOUT / OWI1
FB
ZSSC3281
INP1
Sensor
Bridge
A
INN1
INP2
D
24Bit
EOC/ALARM_1/2,
PWM/FOUT_1/2
CLOCK_OUT,
ARM M3
Pre-Amplifiers
WAKEUP, RESN
A
Sensor Signal Conditioning
D
24Bit
Sensor
Bridge
Measurement Sequencer
SCLK/SCL
MOSI/SDA
SS
MISO
OWI-IN2
SPI
Configuration and
Calibration NVM
INN2
I²C/
I3C
Command Interpreter
System Diagnostics
Firmware Update
Clock
Generator
System
Control
Unit
BOT1, BOT2
Power-ON
Reset
OWI
Ring
Oscillators
Figure 1. Typical Application Diagram
Page 1
© 2023 Renesas Electronics
Rev. 1.1 FW Ver. 1.3.1
Apr.19.23 R33DS0020ED0100