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參數(shù)資料
| 型號： | MXC6202XK |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Ultra Low Cost, 【2.0 g Dual Axis Accelerometer With I2C Interface |
| 中文描述： | 超低成本，【二點零克雙軸加速度計，帶有I2C接口 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 289K |
| 代理商： | MXC6202XK |
RESOLUTION
The accelerometer resolution is limited by noise. The
output noise will vary with the measurement
bandwidth. With the reduction of the bandwidth, by
applying an external low pass filter, the output noise
drops. Reduction of bandwidth will improve the signal
to noise ratio and the resolution. The output noise
scales directly with the square root of the
measurement bandwidth. The maximum amplitude of
the noise, its peak- to- peak value, approximately
defines the worst case resolution of the measurement.
With a simple RC low pass filter, the rms noise is
calculated as follows:
/
(
)
(
Hz
mg
Noise
rms
mg
Noise
=
The peak-to-peak noise is approximately equal to 6.6
times the rms value (for an average uncertainty of
0.1%).
HARDWARE DESIGN CONSIDERATIONS
1. One capacitor is recommended for best rejection
of power supply noise (reference figure below).
The capacitor should be located as close as
possible to the device supply pin (V
DD
). The
capacitor lead length should be as short as
possible, and a surface mount capacitor is
preferred. For typical applications, the capacitor
can be ceramic 0.1
μ
F.
MEMSIC MXC6202xJ/K Rev.A
Page 8 of 11
3/20/2006
)
*
)
(
(
*
)
Hz
Bandwidth
Power supply noise rejection
2. Robust low inductance ground wiring should be
used.
3. Care should be taken to ensure there is “thermal
symmetry” on the PCB immediately surrounding
the MEMSIC device and that there is no
significant heat source nearby. Based on the
experiment, with a 85
°
C heating source at 15mm
away of MEMSIC device, the offset change will be
within 0.7g.
4. A metal ground plane should be added directly
beneath the MEMSIC device. The size of the
plane should be similar to the MEMSIC device’s
footprint and be as thick as possible.
5. Vias can be added symmetrically around the
ground plane. These vias will increase the
thermal isolation of the device from the rest of the
PCB and improve performance.
SOFTWARE DESIGN CONSIDERATION
We recommended that the following software limiter
filter be used in the acceleration signal process
routine in
order to further reduce the noise on the I2C
bus:
Int iAccReal[0x02];//Real-time acceleration data array
Int iAccFilter;//Filtered acceleration data
SoftwareLimiterFilter()
{
if (abs(iAccReal[0x00]-iAccReal[0x01])<0x80) then
iAccFilter=iAccReal[0x00];
iAccReal[0x01]= iAccReal[0x00];
}
I
2
C INTERFACE DESCRIPTION
A slave mode I
2
C (or Inter IC bus) circuit has been
implemented into the MEMSIC thermal accelerometer
as a standard interface for customer applications.
The A/D converter and MCU functionality have been
added to the MEMSIC sensor, thereby increasing
ease-of-use, and lowering power consumption,
footprint and total solution cost.
The I
2
C is an industry standard bi-directional two-wire
interface bus. A master I
C device can operate
READ/WRITE controls to an unlimited number of
devices on the bus by proper addressing. The
MEMSIC accelerometer operates only in a slave
mode, i.e. only responding to calls by a master device
I
2
C BUS CHARACTERISTICS
I
2
C Bus
The two wires in I
2
C bus are called SDA (serial data
line) and SCL (serial clock line). In order for a data
transfer to start, the bus has to be free, which is
defined by both wires in a HIGH output state. Due to
the open-drain/pull-up resistor structure and wired
Boolean “AND” operation, any device on the bus can
pull lines low and overwrite a HIGH signal. The data
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