MAS6502 Datasheet, PDF (1/20 Pages) Micro Analog systems – Piezoresistive Sensor

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 (I²C^® 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.
A bi-directional I²C^® 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
APPLICATIONS
• Low Standby Current Consumption 0.05 µA Typ
• Calibrated Piezoresistive Pressure Modules
• Very Low Supply Current: 0.4 µA…2.5 µA Typ
• Temperature measurement
• Supply Voltage: 2.0 V…3.6 V
• Battery Powered Systems
• Ratiometric ∆Σ Conversion
• Low Frequency Measurement Applications
• Selectable Input Signal Ranges (VDD=2.35V):
• Current/Power Consumption Critical Systems
325 mV_PP, 220 mV_PP, 150 mV_PP, 100 mV_PP
• Industrial and Process Control Applications in
• Selectable Optional Offset (VDD=2.35V):
Noisy Environments
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-Wire Serial Data Interface (I²C^® Bus)
• 256 Bit EEPROM Memory
• Good Noise Performance due to ∆Σ
Architecture
I²C is a registered trademark of NXP.
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