EM6415
Copyright 2002, EM Microelectronic-Marin SA 1 www.emmicroelectronic.com
Sensor Signal Conditioner Circuit with 14 bits A/D Converter
Description
The EM6415 is a high resolution A/D converter in low
voltage CMOS technology intended to be used as a
programmable link between one to four resistive sensors
and a microcontroller.
There is no need of external components for calibration,
error curve compensation or offset and gain adjustment,
nor external amplifiers and sensor bridge drive circuits.
After exposure to a calibration signal/profile, all
conversion parameters and profile coefficients are self
calculated and stored in an external EEPROM.
In addition to a programmable dual slope 10/13/14 bit A/D
conversion, EM6415 allows individual compensation of
not only sensor offset and full scale errors, but also
temperature error compensation of the sensor zero point
and sensitivity, dynamically during the conversion
process. EM6415 also contains a programmable sensor
drive current source.
Features
Full sensor system on chip
Four sensor channel multiplexer
Programmable Dual slope A/D converter
Program selectable 10, 13 or 14 bit resolution
ADC resolves 1µV/Bit
Programmable sensor offset, gain and linearity
High flexibility in zero adjust and full scale adjust
Sensor error compensation performed by software
Parallel 4 bit microcontroller interface
Self calibration of conversion parameters and profile
coefficients
Ultra low noise differential input amplifier with mask
programmable gain
Excellent linearity over full transfer curve
Programmable current source for sensor supplies.
Low supply voltage range 2.2V – 3.6 V
Low operation current, 240 µA at 800 kHz, 3V
Ultra low power consumption (at standby or after
conversion down to less than 0.1 µA)
Small SSOP36-300mils package
Applications
Portable sensor instruments
Telemetry
Resistive sensor interfaces
Automotive sensors
Industrial process control
Consumer instruments
Typical Application
Fig. 1
EM MICROELECTRONIC - MARIN SA
EM6415
MICROCONTROLLER
STROBE
WR
RD
CE
EEPROM
DATA
LCD
VSSD VSSA VREF
D0-D3
CAZ CI
CINT
RINT10
RINT13_14
P3WAY
AZN
VDD
VDDDVDDA
RSEN1
RSEN2
Sensor1
TS1
CH1H
CH1L
Sensor4
TS4
CH4H
CH4L
TS2
CH2H
CH2L
TS3
CH3H
CH3L
Sensor2
Sensor3
CLKP
CLKSEL
VDD
CE
RD
WR
ALE