ZSC31050

Advanced Differential Sensor Signal Conditioner

Data Sheet

July 7, 2013

© 2013 Zentrum Mikroelektronik Dresden AG

— Rev. 1.12

All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior

written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

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2

Circuit Description

Note: This data sheet provides specifications and a general overview of ZSC31050 operation. For details of

operation, including configuration settings and related EEPROM registers, refer to the ZSC31050 Functional

Description.

2.1. Signal Flow

The ZSC31050

’s signal path includes both analog (shown in pink in Figure 2.1) and digital (blue) sections. The

analog path is differential; i.e., the differential bridge sensor signal is handled internally via two signal lines that

are symmetrical around a common mode potential (analog ground = VDDA/2), which improves noise rejection.

Therefore it is possible to amplify positive and negative input signals, which are located in the common mode

range of the signal input.

Figure 2.1

Block Diagram of the ZSC31050

Gain

Factor

Sensor Bridge

Ext. Temp. Sens.

Int. Temp. Sensor

Analog Front-End (AFE)

MUX

ADC

PGA

+



External

Temperature

Sensor

IR_TEMP

VBR

VINP

VINN

Digital Section

Temp. Sens.

Select

ADC Mode

Offset

Shift

CTRL-REGS

SCL

SIF

SDA

PCOMP

FIO1

FIO2

OUT /

OWI

IO1

IO2

DAC

PWM

Interfaces

CMC

EEPROM

RAM

IN3

PGA

Programmable Gain Amplifier

MUX

Multiplexer

ADC

Analog-to-Digital Converter

CMC

Calibration Microcontroller

DAC

Digital-to-Analog Converter

FIO1

Flexible I/O 1: Analog Out (voltage/current), PWM2, ZACwire

FIO2

Flexible I/O 2: PWM1, SPI Data Out, SPI Slave Select, Alarm1, Alarm2

SIF

Serial interface: I

PCOMP

Programmable Comparator

EEPROM

Nonvolatile Memory for Calibration Parameters and Configuration

TS

On-Chip Temperature Sensor (pn-junction)

ROM

Memory for Correction Formula and Algorithm

PWM

PWM Module