Datasheet
ZSSC3241
Sensor Signal Conditioner IC for Resistive Sensors
Jul.14.23
Page 1
Description
The ZSSC3241 is a sensor signal conditioning IC
(SSC) for highly accurate amplification, digitization,
and sensor-specific correction of resistive sensor
signals. The ZSSC3241 provides best-in-class
sensor-element adaptability, and it is suitable for
bridge and half-bridge sensors, as well as external
voltage-source element and single-element sensors
(e.g., Pt100 and external temperature 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 26-bit math core running a correction algorithm
with calibration coefficients stored in a non-volatile,
reprogrammable memory. A second, separate
compensation for gain and offset, and digital-output
independent analog-output correction is supported
for optimum adaptability of dual-domain (analog and
digital) sensor solutions. The programmable,
integrated sensor front-end allows optimally applying
various sensors for a broad range of applications.
The ZSSC3241 provides measurement value
readouts and programming capabilities via an I2C,
SPI, or one-wire interface (OWI). Three different
operation modes allow optimal development of
digital, digital-analog, and analog-output smart
sensor modules including wake-up on request,
continuous-on/fast-response, and automatic/cyclic
sensor measurement operations. Absolute and
ratiometric voltage, current-loop, or interrupt analog
outputs are supported by the ZSSC3241. The
analog output options and digital interface options
(for calibration and/or a digital application interface)
can be combined.
Basic Application Diagram
Features
• Digital communication and calibration interfaces
o SPI up to 10MHz
o I2C (Standard, Fast, and High-Speed Mode)
o One-wire-interface (OWI), up to 100kBit/s
• Accommodates nearly all resistive bridge sensor
types (signal spans from 1mV/V up to 500mV/V)
• Supports different sensor element configurations:
o Resistive bridge or half-bridge
o Resistive divider string
o Voltage source
• On-chip temperature sensor
• External temperature sensing supported, e.g.
sensor-bridge as temperature detector, external
diode, etc.
• Support for Pt100
• Programmable 16-bit digital-to-analog-converter and
output:
o (0V to 1V) or (0V to 5V) absolute voltage output
o V
DD
-ratiometric voltage output
o 4mA to 20mA current-loop output supported
• On-chip voltage regulators for sensor supply, and IC
operation
��� Support for extra regulation by external transistor, for
example JFET
• Programmable 24-bit sensor-signal-conditioning
(main) math core
• Programmable 16-bit signal-conditioning (support)
math core for dual-domain sensor-applications
• Reprogrammable, nonvolatile memory (NVM)
• Programmable measurement scheduler for
continuous sensing applications, with optimized
balance of:
o Energy consumption
o Output update rate
o Self-diagnostic coverage and system safety
• Programmable analog-output clipping
• On-chip diagnostics:
o Sensor connection
o Broken-chip-check / chipping-check
o Memory integrity
ZSSC3241
Datasheet
Jul.14.23
Page 2
Physical Characteristics
• Supply voltage, V
DD
: 2.7V to 5.5V;
with external transistor, for example
JFET: 5V to 48V
• Operating temperature: -40°C to 125°C
• Supported sensor elements: 0.5kΩ to 60kΩ
• Available as die on wafers or 4 4 mm
2
24-QFN
with wettable flanks, allowing visual inspection of
QFN reflow quality
Typical 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
• Pressure, flow, and level sensing
• Industrial applications; e.g. process/factory
automation
• Consumer / white goods, e.g. HVAC, weight scales
• Medical applications, e.g. blood pressure,
continuous smart health monitors
Block Diagram
IC Bias Current
Generator
Power-ON
Reset
Analog
System
Control
Unit
PGA
V
TP
V
TN
INP
INN
VDD
VSSB
Oscillator
Clock
Generator
SCLK/SCL
MISO
MOSI/SDA
SS
VSS
Internal
Voltage
Regulators
Power Ctr.
VDDA int
ZSSC3241
LDOctrl
FB
AOUT /
OWI1
OWI2
in
RESQ
EOC
Digitial Control and
Math Core
NVM
SPI
I2C
OWI
Internal
Temp.
Sensor
Dig
DAC
13-16Bit
MUX
OUT
Ana
Sensor Supply: voltage / ratiometric
Sensor Supply:
current mode
T
EXT
Sensor
Bias
Current
VDDB
AGND / CM
Generator
MUX
SENS-SUP
Chipping
Check
Sensor
Element
Sensor
Connection
Diagnostics
external
Transistor
Regulation
A
D
12-24Bit
DAC-SSC
Input
Multiplexer
Typical Application Examples
Sensor Half-
Bridge
Rt1
PTC /
NTC
ZSSC3241
VSSB
MISO
SS
AOUT / OWI1
VDDB
MOSI / SDA
SCLK / SCL
VDD
VSS
INP
INN
RESQ
4
V
DD
(2.7 to 5.5V)
OWI
Digital Interface:
I2C or SPI or OWI
Digital Half-Bridge Sensor, e.g. PT100
ZSSC3241
VSSB
AOUT / OWI1
VDDB
V
DD
VSS
INP
INN
4
Sensor Bridge
VDD
(2.7-5.5V)
V
OUT, absolute
(0 to 1V / 0 to 5V)
OWI
C
AOUT,EMC
Analog Sensor with Absolute Voltage Out
ZSSC3241
VSSB
MISO
SS
AOUT /
OWI1
VDDB
MOSI / SDA
SCLK / SCL
VDD
VSS
INP
INN
RESQ
4
Sensor Bridge
V
DD
(2.7 to 5.5V)
V
OUT, ratiometric
(2.5% to 97.5% of V
DD
)
OWI
Digital Interface:
I2C or SPI or OWI
V
DD
(2.7 to 5.5V)
Sensor with Ratiometric Voltage Output and Digital
Interface
ZSSC3241
LDOctrl
VSSB
FB
AOUT / OWI1
VDDB
VDD
VSS
INP
OWI2
in
INN
4
Sensor Bridge
R
sens
Loop-
4 to 20 mA
Loop+
(7 to 48V)
5 to 5.5V
OWI
Analog Sensor with Current Loop Output, OWI, and External
JFET