参数资料
型号: MMA6823AKW
厂商: Freescale Semiconductor
文件页数: 41/54页
文件大小: 0K
描述: IC ACCELEROMETER XY AXIS 16QFN
标准包装: 75
轴: X,Y
加速范围: ±120g,±60g
灵敏度: 4.1 LSB/g,8.2 LSB/g
电源电压: 3.135 V ~ 5.25 V
输出类型: SPI
带宽: 400Hz
接口: SPI
安装类型: 表面贴装
封装/外壳: 16-QFN 裸露焊盘
供应商设备封装: 16-QFN-EP(6x6)
3.9
Serial Peripheral Interface
MMA68xx includes a Serial Peripheral Interface (SPI) to provide access to the configuration registers and digital data. Refer-
ence Section 4 for details regarding the SPI protocol and available commands.
To maximize independence between the X and Y channels, MMA68xx includes two interface blocks, one for each axis. The
X-axis interface block responds only to X-axis acceleration requests, or even addressed register commands. The Y-axis interface
block responds only to Y-axis acceleration requests, or odd addressed register commands. To the SPI master, MMA68xx oper-
ates as a single device. The internal independent blocks are transparent.
Each SPI block has an independent shift register. Once a message is received (rising edge of CS), the contents of the two
shift registers are compared. If the contents do not match, the Y-Axis SPI block will not respond, and the X-Axis SPI block will
respond with a SPI Error as shown in Table 30 . If the contents match, each SPI block decodes the message, and the appropriate
block enables MISO for a response during the next SPI message.
Figure 30 shows an internal diagram of the MMA68xx SPI.
Registers
X SPI
If Bit 13 == ’1’
If Bit 13 = ’0’
& Bit 14 == ’0’
& A0 == ’0’
SPI Master
Even Address Regs
X SPI Shift Register
X-Axis Raw Data
CS_M
CS
CS
X-Axis OC Data
SPI Mismatch Error (SPI Error)
SCLKM SCLK
MOSI
MOSIM
MISO
MISOM
SCLK
MOSI
MISO
I/O
Odd Address Regs
Y-Axis Raw Data
Y SPI Shift Register
Y-Axis OC Data
If Bit 13 == ’1’
Y SPI
If Bit 13 = ’0’
& Bit 14 == ’1’
& A0 == ’1’
Figure 30. SPI Diagram
MMA68xx
Sensors
Freescale Semiconductor, Inc.
41
相关PDF资料
PDF描述
MMA6821KW IC ACCELEROMETER XY AXIS 16QFN
MMA6811AKW IC ACCELEROMETER XY AXIS 16QFN
MMA6555KW IC ACCELEROMETER X AXIS 16QFN
91566-1 SDE SAHT 20-26 EI
91562-1 SDE SAHT 26-30 EI
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