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MMA7455LR2 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MMA7455LR2 Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 35 page Sensors Freescale Semiconductor 9 MMA7455L g-Select The g-Select feature enables the selection between 3 acceleration ranges for measurement. Depending on the values in the Mode control register ($16), the MMA7455L’s internal gain will be changed allowing it to function with a 2g, 4g or 8g measurement sensitivity. This feature is ideal when a product has applications requiring two or more acceleration ranges for optimum perfor- mance and for enabling multiple functions. The sensitivity can be changed during the operation by modifying the two GLVL bits located in the mode control register. Standby Mode This digital output 3-axis accelerometer provides a standby mode that is ideal for battery operated products. When standby mode is active, the device outputs are turned off, providing significant reduction of operating current. When the device is in standby mode the current will be reduced to 2.5 µA typical. In standby mode the device can read and write to the registers with the I2C/ SPI available, but no new measurements can be taken in this mode as all current consuming parts are off. The mode of the device is controlled through the mode control register by accessing the two mode bits as shown in Table 6. Measurement Mode During measurement mode, continuous measurements on all three axes enabled. The g-range for 2g, 4g, or 8g are selectable with 8-bit data and the g-range of 8g is selectable with 10-bit data. The sample rate during measurement mode is 125 Hz with 62.5 BW filter selected. The sample rate is 250 Hz with the 125 Hz filter selected. Therefore, when a conversion is complete (signaled by the DRDY flag), the next measurement will be ready. When measurements on all three axes are completed, a logic high level is output to the DRDY pin, indicating “measurement data is ready.” The DRDY status can be monitored by the DRDY bit in Status Register (Address: $09). The DRDY pin is kept high until one of the three Output Value Registers are read. If the next measurement data is written before the previous data is read, the DOVR bit in the Status Register will be set. Also note that in measurement mode, level detection mode and pulse detection mode are not available. By default all three axes are enabled. X and/or Y and/or Z can be disabled. There is a choice between detecting an absolute signal or a positive or negative only signal on the enabled axes. There is also a choice between doing a detection for motion where X or Y or Z > Threshold vs. doing a detection for freefall where X & Y & Z < Threshold. $16: Mode Control Register (Read/Write) D7 D6 D5 D4 D3 D2 D1 D0 Bit -- DRPD SPI3W STON GLVL[1] GLVL[0] MODE[1] MODE[0] Function 0 0 0 0 0 0 0 0 Default Table 5. Configuring the g-Select for 8-bit output using Register $16 with GLVL[1:0] bits. GLVL [1:0] g-Range Sensitivity 00 8g 16 LSB/g 01 2g 64 LSB/g 10 4g 32 LSB/g Table 6. Configuring the Mode using Register $16 with MODE[1:0] bits. MODE [1:0] Function 00 Standby Mode 01 Measurement Mode 10 Level Detection Mode 11 Pulse Detection Mode |
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