DA6502.008
29 November 2012
MAS6502
Piezoresistive Sensor
Signal Interface IC
•
Optimized for Piezoresistive
Pressure Sensors
•
Very Low Power Consumption
•
Ratiometric 16 Bit
∆Σ
ADC
•
Linearity 14 Bits
•
Internal Clock Oscillator
•
Serial Data Interface (I
2
C
®
Bus)
•
256 Bit EEPROM Memory
DESCRIPTION
MAS6502 is a 16 bit Analog-to-Digital Converter
(ADC), which employs a delta-sigma (
Σ)
conversion technique. With the linear input signal
range of 260 mV
PP
the linearity is 14 bits.
MAS6502 is designed especially to meet
the requirement for low power consumption, thus
making it an ideal choice for battery powered
systems. The MAS6502 is equipped with a standby
function, i.e. the ADC is in power down between
each conversion. By utilizing this and overall low
power consumption, current consumption values of
2.5 µA (one pressure conversion in a second with
full 14-bit accuracy) or less can be achieved.
MAS6502 has an on-chip second order
decimator filter to process the output of the second
order
Σ
-modulator. The ADC also has four
selectable input signal ranges with one optional
offset level. An internal trimmed clock oscillator
provides a system clock signal (DCLK) eliminating
the need for an external clock signal.
2
A bi-directional I C
®
bus compatible 2-wire
serial bus is used for configuring conversion
parameters, starting conversion and reading out the
A/D conversion result.
MAS6502 has one input channel suitable
for a piezoresistive pressure sensor. In addition to
pressure measurement the device can be
configured also for temperature measurement.
The 256-bit EEPROM memory is available
for storing trimming and calibration data on chip.
FEATURES
•
•
•
•
•
•
Low Standby Current Consumption 0.05 µA Typ
Very Low Supply Current: 0.4 µA…2.5 µA Typ
Supply Voltage: 2.0 V…3.6 V
Ratiometric
Σ
Conversion
Selectable Input Signal Ranges (VDD=2.35V):
325 mV
PP
, 220 mV
PP
, 150 mV
PP
, 100 mV
PP
Selectable Optional Offset (VDD=2.35V):
33 mV
Selectable Sensor Resistance Values
5 kΩ, 4.5 kΩ, 4 kΩ, 3.4 kΩ
Over Sampling Ratio: 512, 256, 128, 64
Internal System Clock Signal 100 kHz
Conversion Times 0.8 ms…10.6 ms Typ
2
2-Wire Serial Data Interface (I C
®
Bus)
256 Bit EEPROM Memory
Good Noise Performance due to
Σ
Architecture
APPLICATIONS
•
•
•
•
•
•
Calibrated Piezoresistive Pressure Modules
Temperature measurement
Battery Powered Systems
Low Frequency Measurement Applications
Current/Power Consumption Critical Systems
Industrial and Process Control Applications in
Noisy Environments
•
•
•
•
•
•
I
2
C is a registered trademark of NXP.
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MAS [ MICRO ANALOG SYSTEMS ]
