参数资料
型号: MMA6826AKW
厂商: Freescale Semiconductor
文件页数: 42/54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: ±60g
灵敏度: 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)
3.10
Device Initialization
Following powerup, undervoltage reset, or a SPI reset command sequence, MMA68xx proceeds through an internal initializa-
tion process as shown below. Figure 31 also shows the MMA68xx performance for an example external system level initialization
procedure.
Internal Initialization
OTP Copy to
Mirror Registers
Offset Cancellation
Startup Phase 1
t OC_PHASE1
Offset Cancellation
Startup Phase 2
t OC_PHASE2
Offset Cancellation
Startup Phase 3
t OC_PHASE3
Offset Cancellation
Normal Mode
External Initialization
and
Set ENDINIT
Delay
Read DEVSTAT
to clear flags
Re-read DEVSTAT
to verify Status Dly
Initialize R/W
Registers to
Desired State
Verify X-Axis
Offset
Dly
Verify X-Axis
Self-Test &
ARM_X Asserted
Verify Y-Axis
Offset & ARM_Y
Deasserted
Dly
Verify X-Axis
Offset & ARM_X
Deasserted
Verify Y-Axis
Self-Test &
ARM_Y Asserted
Dly
Verify X-Axis Re-Initialize
Offset & ARM_X R/W Registers
Deasserted
(if needed)
Verify Y-Axis
Offset & ARM_Y
Deasserted
Normal
Mode
t STRISE
t OP
X_ST
X_ARM
Assertion
Dependent on
Arming Mode
t ST_OMB
Deassertion
Dependent on Pulse
Stretch and/or Arming Mode
Y_ST
Assertion
Dependent on
t STFALL
Deassertion
Dependent on Pulse
Y_ARM
Arming Mode
Deactivate
Activate
Stretch and/or Arming Mode
POR
Ready for SPI
Command
Internal
Offset Error
Activate
X-Axis
X-Axis
Self -Test
Y-Axis
Self-Test
Deactivate
Y-Axis
ENDINIT Clear
Corrected to ’0’
Self-Test
Self-Test
Notes:1) X-Axis and Y-Axis Self-Test can be enabled and evaluated simultaneously to reduce test time.
For failure mode coverage of the arming pins and of potential common axis failures, Freescale recommends independent self-test activation.
2) t STRISE and t STFALL are dependent on the selected LPF group delay.
Figure 31. Initialization Process
MMA68xx
Sensors
42
Freescale Semiconductor, Inc.
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