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User Manuals: Freescale Semiconductor MMA7455L 3-Axis
Manuals and User Guides for Freescale Semiconductor MMA7455L 3-Axis. We have
1
Freescale Semiconductor MMA7455L 3-Axis manual available for free PDF download: Technical Data Manual
Freescale Semiconductor MMA7455L Technical Data Manual (35 pages)
±2g/±4g/±8g Three Axis Low-g Digital Output Accelerometer
Brand:
Freescale Semiconductor
| Category:
Microcontrollers
| Size: 0 MB
Table of Contents
Table of Contents
2
Pin Descriptions
5
Electro Static Discharge (Esd)
6
Maximum Ratings
6
Principle of Operation
8
Operating Characteristics
8
Features
9
Self-Test
9
G-Select
9
Standby Mode
9
Measurement Mode
9
16: Mode Control Register (Read/Write)
9
Configuring the G-Select for 8-Bit Output Using Register $16 with GLVL[1:0] Bits
9
Configuring the Mode Using Register $16 with MODE[1:0] Bits
9
THOPT = 0 Absolute; THOPT = 1 Positive Negative
10
Level Detection
10
18: Control 1 (Read/Write) Setting the Detection Axes for X, y and Z
10
19: Control 2 (Read/Write) Motion Detection (or Condition) or Freefall Detection (and Condition)
10
18: Control 1 (Read/Write): Setting the Threshold to be an Integer Value or an Absolute Value
10
Level Detection Threshold Limit Value (Read/Write)
10
Threshold Detection for Motion and Freefall Conditions
11
CASE 1: Motion Detection
11
CASE 2: Motion Detection
11
CASE 3: Freefall Detection
11
CASE 4: Freefall Detection
11
Pulse Detection Threshold Limit Value (Read/Write)
12
Pulse Duration Value (Read/Write)
12
CASE 2: Freefall Detection: X and y and Z < Pulse Threshold for Time > Latency Time
13
Pulse Detection
12
18: Control 1 (Read/Write): Disable X, y or Z for Pulse Detection
12
19: Control 2 (Read/Write): Motion Detection (or Condition) or Freefall Detection (and Condition)
12
CASE 1: Single Pulse Motion Detection: X or y or Z > Pulse Threshold for Time < Pulse Duration
12
Single Pulse Detection
13
Pulse Detection Threshold Limit Value (Read/Write)
13
Latency Time Value (Read/Write)
13
CASE 3: Double Pulse Detection: X or y or Z > Threshold for Pulse Duration1 < Pdtime1, Latency Time
14
Double Pulse Detection
14
Pulse Detection Threshold Limit Value (Read/Write)
14
Pulse Duration Value (Read/Write)
14
Latency Time Value (Read/Write)
14
Time Window for 2Nd Pulse Value (Read/Write)
14
$18 Control 1 Register
15
Configuring the Interrupt Settings Using Register $18 with INTREG[1:0] Bits
15
17: Interrupt Latch Reset (Read/Write)
15
Detecting Interrupts
16
Assigning, Clearing & Detecting Interrupts
15
Clearing the Interrupt Pins: Register $17
15
Detection Source Register (Read Only)
16
Digital Interface
16
I 2 C Slave Interface
16
Single Byte Read - the Master Is Reading One Address from the MMA7455L
17
Multiple Bytes Read - the Master Is Reading Multiple Sequential Registers from the MMA7455L
17
Single Byte Write - the Master (MCU) Is Writing to a Single Register of the MMA7455L
17
SPI Slave Interface
18
SPI Timing Diagram for 8-Bit Register Read (4 Wire Mode)
18
SPI Timing Diagram for 8-Bit Register Read (3 Wire Mode)
18
SPI Timing Diagram for 8-Bit Register Write (3 Wire Mode)
18
Basic Connections
19
Pin Descriptions
19
Recommended PCB Layout for Interfacing Accelerometer to Microcontroller
19
User Register Summary
21
00: 10Bits Output Value X LSB (Read Only)
21
Register Definitions
21
01: 10Bits Output Value X MSB (Read Only)
22
02: 10Bits Output Value y LSB (Read Only)
22
03: 10Bits Output Value y MSB (Read Only)
22
06: 8Bits Output Value X (Read Only)
22
07: 8Bits Output Value y (Read Only)
22
08: 8Bits Output Value Z (Read Only)
23
09: Status Register (Read Only)
23
Detection Source Register (Read Only)
23
I2C Device Address (Bit 6-0: Read Only, Bit 7: Read/Write)
23
User Information (Read Only: Optional)
23
Who am I" Value (Read Only: Optional)
24
10: Offset Drift X LSB (Read/Write)
24
11: Offset Drift X MSB (Read/Write)
24
12: Offset Drift y LSB (Read/Write)
24
13: Offset Drift y MSB (Read/Write)
24
14: Offset Drift Z LSB (Read/Write)
25
15: Offset Drift Z MSB (Read/Write)
25
16: Mode Control Register (Read/Write)
25
Configuring the G-Select for 8-Bit Output Using Register $16 with GLVL[1:0] Bits
25
Configuring the Mode Using Register $16 with MODE[1:0] Bits
25
17: Interrupt Latch Reset (Read/Write)
26
Control 1 (Read/Write)
26
Configuring the Interrupt Settings Using Register $18 with INTREG[1:0] Bits
26
Pulse Detection Threshold Limit Value (Read/Write)
27
Pulse Duration Value (Read/Write)
27
Latency Time Value (Read/Write)
27
Time Window for 2Nd Pulse Value (Read/Write)
27
Level Detection Threshold Limit Value (Read/Write)
27
Sensing Direction and Output Response at 2G Mode
28
Acceleration Vs. Output (8-Bit Data)
28
Recommended PCB Land Pattern for the 5 X 3 MM LGA Package
29
Soldering and Mounting Guidelines for the Lga Accelerometer Sensor to a Pc Board
29
Recommended PCB Land Pad, Solder Mask, and Signal Trace Near Package Design
30
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