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Micro Analog systems
Micro Analog systems

MAS6502 Datasheet Preview

MAS6502 Datasheet

Piezoresistive Sensor Signal Interface IC

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MAS6502 pdf
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 mVPP 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 mVPP, 220 mVPP, 150 mVPP, 100 mVPP
Industrial and Process Control Applications in
Selectable Optional Offset (VDD=2.35V):
Noisy Environments
33 mV
Selectable Sensor Resistance Values
5 k, 4.5 k, 4 k, 3.4 k
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.
1 (20)



Micro Analog systems
Micro Analog systems

MAS6502 Datasheet Preview

MAS6502 Datasheet

Piezoresistive Sensor Signal Interface IC

No Preview Available !

MAS6502 pdf
DA6502.008
29 November 2012
BLOCK DIAGRAM
VDD
PI
NI
COMMON
R3
P
T
P
VDD T
R1
VREFP
TE3
OSC
EEPROM
ADC
CONTROL
I2C
SDA
SCL
VREFN
XCLR
EOC
R4
PT
R2
T
GND
MAS6502
TEST
TE1 TE2
Figure 1. MAS6502 block diagram
ABSOLUTE MAXIMUM RATINGS
Parameter
Symbol
Conditions
All Voltages with Respect to Ground
Min Max Unit
Supply Voltage
VDD
-0.3 5.0 V
Voltage Range for All Pins
-0.3 VIN + 0.3 V
Latchup Current Limit
ILUT For all pins, test according to -100
JESD78A.
+100
mA
Junction Temperature
TJmax
+ 150
°C
Storage Temperature
TS
Note 1
- 55
+125
°C
Note 1. See EEPROM memory data retention at hot temperature. Storage or bake at hot temperatures will reduce the wafer level trimming
and calibration data retention time.
Note: The absolute maximum rating values are stress ratings only. Functional operation of the device at conditions between maximum
operating conditions and absolute maximum ratings is not implied and EEPROM contents may be corrupted. Exposure to these conditions
for extended periods may affect device reliability (e.g. hot carrier degradation, oxide breakdown). Applying conditions above absolute
maximum ratings may be destructive to the devices.
Note: This is a CMOS device and therefore it should be handled carefully to avoid any damage by static voltages (ESD).
RECOMMENDED OPERATION CONDITIONS
Parameter
Symbol
Conditions
Min Typ Max Unit
Supply Voltage
VDD
2.0 2.35 3.6
V
Supply Voltage at EEPROM
Programming
VDD
T=+25°C. Note 1.
3.0 3.3 3.6
V
Operating Temperature
TA
-40 +25 +85
°C
The device performance may deteriorate in the long run if the Recommended Operation Conditions limits are continuously exceeded.
Note 1. It is recommended to program the EEPROM at room temperature.
2 (20)


Part Number MAS6502
Description Piezoresistive Sensor Signal Interface IC
Maker Micro Analog systems
Total Page 20 Pages
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