"MMA8451Q三轴陀螺仪数据手册及技术规格.pdf"

需积分: 23 181 浏览量更新于2023-12-20 收藏 572KB PDF 举报

The MMA8451Q is a three-axis, 14-bit/8-bit digital accelerometer designed by Freescale Semiconductor. The device is designed to be an energy-efficient solution, making it ideal for applications where power consumption is a concern. The accelerometer utilizes capacitive micromachined technology, allowing for precise and accurate measurements of acceleration in three axes. The data handbooks provided for the MMA8451Q, namely "MMA8451陀螺仪芯片手册.pdf" and "三轴陀螺仪数据手册", offer detailed technical information and specifications for the device. The documents contain essential details about the features, electrical characteristics, and operational parameters of the accelerometer, providing engineers and designers with the necessary information to integrate the sensor into their applications. The "MMA8451陀螺仪芯片手册.pdf" and "三轴陀螺仪数据手册" handbooks serve as valuable resources for understanding the capabilities and limitations of the MMA8451Q accelerometer. The information contained within these documents is crucial for ensuring the proper utilization and performance of the sensor in various electronic systems and devices. Overall, the MMA8451Q accelerometer, supported by comprehensive technical data and specifications, offers a reliable and efficient solution for measuring acceleration in three dimensions. With its low-power design and advanced technology, the accelerometer is well-suited for a wide range of applications, from consumer electronics to industrial equipment, where precise motion sensing is essential. Freescale Semiconductor's commitment to providing detailed technical information demonstrates their dedication to supporting engineers and developers in creating innovative and high-quality products.

Sensors

Freescale Semiconductor 9

MMA8451Q

2 Mechanical and Electrical Specifications

2.1 Mechanical Characteristics

Table 2. Mechanical Characteristics @ VDD = 2.5 V, VDDIO = 1.8 V, T = 25°C unless otherwise noted.

Parameter Test Conditions Symbol Min Typ Max Unit

Measurement Range

(1)

1. Dynamic Range is limited to 4g when the Low Noise bit in Register 0x2A, bit 2 is set.

FS[1:0] set to 00

2g Mode

±2

FS[1:0] set to 01

4g Mode

±4

FS[1:0] set to 10

8g Mode

±8

Sensitivity

FS[1:0] set to 00

2g Mode

4096

counts/g

FS[1:0] set to 01

4g Mode

2048

FS[1:0] set to 10

8g Mode

1024

Sensitivity Accuracy

(2)

2. Sensitivity remains in spec as stated, but changing Oversampling mode to Low Power causes 3% sensitivity shift. This behavior is also seen

when changing from 800 Hz to any other data rate in the Normal, Low Noise + Low Power or High Resolution mode.

Soa ±2.5 %

Sensitivity Change vs. Temperature

FS[1:0] set to 00

2g Mode

TCSo ±0.008 %/°C

FS[1:0] set to 01

4g Mode

FS[1:0] set to 10

8g Mode

Zero-g Level Offset Accuracy

(3)

3. Before board mount.

FS[1:0] 2g, 4g, 8g TyOff ±20 mg

Zero-g Level Offset Accuracy Post Board Mount

(4)

4. Post Board Mount Offset Specifications are based on an 8 Layer PCB, relative to 25°C.

FS[1:0] 2g, 4g, 8g TyOffPBM ±30 mg

Zero-g Level Change vs. Temperature -40°C to 85°C TCOff ±0.15 mg/°C

Non-Linearity

Best Fit Straight Line

Over ±2g range

±0.2

%FS

±8g range ±0.5

Self-Test Output Change

(5)

5. Self-Test is one direction only.

FS[1:0] set to 0

4g Mode

Vst

+181

+255

+1680

LSB

ODR Accuracy

2 MHz Clock ±2

Output Data Bandwidth BW ODR/3 ODR/2 Hz

Output Noise Normal Mode ODR = 400 Hz Noise 126 µg/√Hz

Output Noise Low Noise Mode

(1)

Normal Mode ODR = 400 Hz Noise 99 µg/√Hz

Operating Temperature Range Top -40 +85 °C

Sensors

Freescale Semiconductor 11

MMA8451Q

2.3 I

C Interface Characteristic

Table 4. I

C Slave Timing Values

(1)

1. All values referred to VIH (min) and VIL (max) levels.

Parameter Symbol

C Fast Mode

Unit

Min Max

SCL Clock Frequency

Pull-up = 4.7 k

Ω, Cb = 20 pF

Pull-up = 4.7 k

Ω, Cb = 40 pF

Pull-up = 4.7 k

Ω, Cb = 400 pF

Pull-up = 1 k

Ω, Cb = 20 pF

Pull-up = 1 k

Ω, Cb = 400 pF

SCL

2.250

100

Non-functional

4.50

750

MHz

kHz

—

MHz

kHz

Bus Free Time between STOP and START Condition t

BUF

1.3 μs

Repeated START Hold Time t

HD;STA

0.6 μs

Repeated START Set-up Time t

SU;STA

0.6 μs

STOP Condition Set-up Time t

SU;STO

0.6 μs

SDA Data Hold Time

(2)

2. t

HD;DAT

is the data hold time that is measured from the falling edge of SCL, applies to data in transmission and the acknowledge.

HD;DAT

(3)

3. The maximum t

HD;DAT

could be 3.45 μs and 0.9 μs for Standard mode and Fast mode, but must be less than the maximum of t

VD;DAT

or t

VD;ACK

by a transition time.

μs

SDA Valid Time

(4)

4. t

VD;DAT

= time for Data signal from SCL LOW to SDA output (HIGH or LOW, depending on which one is worse).

VD;DAT

0.9

(3)

μs

SDA Valid Acknowledge Time

(5)

5. t

VD;ACK

= time for Acknowledgement signal from SCL LOW to SDA output (HIGH or LOW, depending on which one is worse).

VD;ACK

0.9

(3)

μs

SDA Set-up Time t

SU;DAT

100

(6)

6. A Fast mode I

C device can be used in a Standard mode I

C system, but the requirement t

SU;DAT

250 ns must then be met. This will

automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the LOW period of the

SCL signal, it must output the next data bit to the SDA line t

(max) + t

SU;DAT

= 1000 + 250 = 1250 ns (according to the Standard mode I

specification) before the SCL line is released. Also the acknowledge timing must meet this set-up time

SCL Clock Low Time t

LOW

4.7 μs

SCL Clock High Time t

HIGH

4 μs

SDA and SCL Rise Time t

1000 ns

SDA and SCL Fall Time

(7) (8)

7. Cb = total capacitance of one bus line in pF.

8. The maximum t

for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage t

is specified at 250 ns.

This allows series protection resistors to be connected in between the SDA and the SCL pins and the SDA/SCL bus lines without exceeding

the maximum specified t

300 ns

Pulse width of spikes on SDA and SCL that must be suppressed by input filter t

50 ns

剩余52页未读，继续阅读

&春风有信

粉丝: 1w+
资源: 37

"MMA8451Q三轴陀螺仪数据手册及技术规格.pdf"

MMA8451 datasheet

Python库 | adafruit-circuitpython-mma8451-1.3.0.tar.gz

加速度传感器MMA7455l芯片资料.pdf

MMA开启元宇宙营销时代.pdf

MMA：开启元宇宙时代.pdf

基于Linux的加速度传感器mma8653驱动程序的设计.pdf

MMA7361L-芯片资料介绍.pdf

MMA开启元宇宙营销时代(The Metaverse is the Medium 2021)-MMA-2021-44页.pdf

开启元宇宙营销时代(The Metaverse is the Medium 2021)-MMA-2021-44页.pdf

MMA7660 陀螺仪 姿态角

最新资源

MMA7660 陀螺仪姿态角