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PDF MAS6501 Data sheet ( Hoja de datos )
| Número de pieza | MAS6501 | |
| Descripción | 16-Bit Analog-to-Digital Converter | |
| Fabricantes | Micro Analog systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAS6501 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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This is preliminary information on a new
product under development. Micro Analog
Systems Oy reserves the right to make any
changes without notice.
DA6501.001
27 October 2008
MAS6501
16-Bit Analog-to-Digital Converter
• Standby Current Consumption
0.1 µA
• Low Supply Current
• Low Power Consumption
• Resolution 16 Bits
• Ratiometric ∆Σ ADC
• ENOB 14 Bits
• Serial Data Output (I2C bus)
DESCRIPTION
The MAS6501 is a 16 bit Analog-to-Digital
Converter (ADC), which employs a delta-sigma (∆Σ)
conversion technique. With the linear input signal
range of 282 mVPP its resolution is 14 bits.
The MAS6501 is designed especially to
meet the requirement for low power consumption,
thus making it an ideal choice for battery powered
systems. The MAS6501 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
1.6 µA (one pressure conversion in a second with
full 14-bit accuracy) or less can be achieved.
The MAS6501 has an on-chip second order
decimator filter to process the output of the second
order ∆Σ -modulator. The ADC also has two
selectable conversion ranges with two optional
offset levels.
A bi-directional 2-wire I2C bus is used for
configuring conversion parameters, starting
conversion and reading out the A/D conversion
result.
MAS6501 has one input channel suitable for
piezo resistive pressure sensor. In addition to
pressure measurement configuration the device can
be configured to temperature measurement.
FEATURES
• Low Standby Current Consumption 0.1 µA Typ
• Low Supply Current: 0.2 µA..1.6 µA
• Supply Voltage: 2.0 V…3.6 V
• Ratiometric ∆Σ Conversion
• Two Input Signal Ranges (VDD=2.35V):
325 mVPP , 98 mVPP
• Two Optional Offsets (VDD=2.35V):
123 mV, 33 mV
• Over Sampling Ratio: 512, 256, 128, 64
• Conversion Times 32.2 ms…2.5 ms
• In Fast Mode: Over Sampling Ratio 64,
Conversion Time 2.5 ms, Resolution 10 Bits
• Good Noise Performance due to ∆Σ
Architecture
• 2-Wire I2C Interface
APPLICATIONS
• Battery Powered Systems
• Low Frequency Measurement Applications
• Pressure and Temperature Measurement
• Current/Power Consumption Critical Systems
• Industrial and Process Control Applications in
Noisy Environments
I2C is a registered trademark of Philips Inc.
1 (16)
1 page  
DA6501.001
27 October 2008
MAS6501 CONTROL REGISTER
Table 1. MAS6501 control register bit description
Bit Number Bit Name
Description
7-6 OSRS(1:0) Over Sampling Ratio
(OSR) selection
5
SCO
Start Conversion
4
PTS
Pressure/Temperature
Selection
3 ISCR Input Signal
Conversion Range
2 XENMCLKDIV Enable Master Clock
Division
1
XOSENABLE
Enable offset
0 OSSELECT Offset value selection
Value
11
01
10
00
0
1
1
0
1
0
0
1
0
1
1
0
Function
OSR = 512
OSR = 256
OSR = 128
OSR = 64
No Conversion
Start Conversion
Pressure configuration
Temperature configuration
325 mV (282 mV linear range)
98 mV (85 mV linear range)
MCLK division enabled
MCLK division disabled
Offset enabled
Offset disabled
+123 mV
+33 mV
MAS6501 has one control register for configuring
the measurement setup. See table 1 for control
register bit definitions. Control register values are
set via I2C bus.
First two OSRS bits of the control register define
four selectable over sampling ratios. The higher
OSR the better ADC accuracy but the longer
conversion time.
The SCO bit controls the A/D conversion. When
SCO = 0, no A/D conversion takes place. When
SCO = 1, the A/D converter turns on and the analog
data is being converted. Then MCLK must be
clocked at least until EOC pin goes high indicating
that conversion has been accomplished.
PTS bit selects between pressure and temperature
measurement. In temperature measurement the
sensor is connected in bridge configuration together
with four integrated resistors (see figure 3 on page 8
and resistors R1, R2, R3 and R4).
low, the MCLK division is enabled and the internal
clock frequency fCLK(INT) = fMCLK/2, where
fMCLK is the master clock frequency. When the
XENMCLKDIV bit is high, the MCLK division is
disabled and fCLK(INT) = fMCLK.
In the XENMCLKDIV = 1 mode the duty cycle
should be as close to 50 % as possible. In this
mode, the conversion time is made half (see page 3
conversion time values with XENMCLKDIV = 1)
compared to clock speed division mode
XENMCLKDIV = 0 whereas the resolution remains
unchanged. In XENMCLKDIV = 0 mode the
conversion time and also current consumption are
doubled but then the external master clock signal
MCLK does not need to have close to 50% duty
cycle.
XOSENABLE can be used to enable input signal
range offset option. At 1 value no offset is applied
but at 0 value an offset value which is determined
with OSSELECT bit is used.
ISCR selects between two A/D conversion ranges.
The XENMCLKDIV bit controls the internal clock
frequency of MAS6501, fCLK(INT). When the bit is
OSSELECT selects between two offset values. No
offset is applied if offset is disabled
(XOSENABLE=1).
5 (16)
5 Page 
DA6501.001
27 October 2008
SAMPLES IN SBDIL 20 PACKAGE
PI 1
COMMON 2
GND 3
NC 4
NC 5
NC 6
NC 7
NC 8
EOC 9
VDD 10
20 TE2
19 NI
18 TE1
17 NC
16 NC
15 NC
14 SCL
13 SDA
12 XCLR
11 MCLK
Top Marking Definitions:
YYWW = Year Week
XXXXX.X = Lot Number
xx = Sample Version
PIN DESCRIPTION
Pin Name Pin
Type
Function
Notes
PI 1 AI ADC Positive Input
COMMON
GND
2
3
4
5
AI Sensor Ground
G Supply Ground
NC
NC
6 NC
7 NC
8 NC
EOC
VDD
MCLK
XCLR
SDA
SCL
TE1
NI
9 DO End of Conversion
10 P Power Supply
11 DI Master Clock
12 DI Clear I2C, Stop Conversion
13 DI/O Serial Bus Data Input/Output
14 DI Serial Bus Clock
15 NC
16 NC
17 NC
18 DI/O Test Pin 1
19 AI ADC Negative Input
TE2 20 DI Test Pin 2
A = Analog, D = Digital, P = Power, G = Ground, I = Input, O = Output, NC = Not Connected
Pin must be left floating
Pin must be left floating
11 (16)
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAS6501.PDF ] | |
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