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MMA9550LR1 Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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MMA9550LR1 Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 25 page  MMA955xL Sensors Freescale Semiconductor, Inc. 11 3.2.2 Sensing Direction and Output Response The following figure shows the device’s default sensing direction when measuring gravity in a static manner. Also included are the standard abbreviations or names for the six different orientation modes: portrait up/down, landscape left/right and back/front. Figure 6. Sensing direction and output response 3.2.3 Pin Functions The following table summarizes functional options for each pin on this device. Table 3. Pin functions Pin # Pin Function #1(1) 1. Pin function #1 represents the reset state of the hardware. Pin functions can be changed via the SIM pin, mux-control registers in Freescale or user firmware. Pin Function #2 Pin Function #3 Description 1 VDD Digital power supply 2 BKGD/MS RGPIO9 Background-debug / Mode select / RGPIO9 3 RESETB(2) 2. RESETB is an open-drain, bidirectional pin. Reset must be pulled high at startup. After startup, Reset may be asserted to reset the device. Active-low reset 4 SCL0 RGPIO0 SCLK Serial clock for slave I2C / RGPIO0 / Serial clock for slave SPI 5 VSS Digital ground 6 SDA0 RGPIO1 SDI Serial data for slave I2C / RGPIO1 / SPI serial data input 7RGPIO2 SCL1 SDO RGPIO2 / Serial clock for master I2C / SPI serial data output 8(3) 3. RGPIO3/SDA1/SSB = Low at startup selects SPI. High at startup selects I2C. This is a function of the application boot code, not of the hardware. RGPIO3 SDA1 SSB RGPIO3 / Serial data for master I2C / SPI slave select 9 RGPIO4 INT RGPIO4 / Interrupt input 10 RESERVED (Connect to VSS) (Must be grounded externally.) 11 RGPIO5 PDB_A INT_O RGPIO5 / PDB_A / INT_O slave-port interrupt output 12 RGPIO6 AN0 TPMCH0 RGPIO6 / ADC Input 0 / TPM Channel 0 13 RGPIO7 AN1 TPMCH1 RGPIO7 / ADC Input 1 / TPM Channel 1 14 VDDA Analog power 15 RGPIO8 PDB_B RGPIO8 / PDB_B 16 VSSA Analog ground Top View PU Gravity Pin 1 Xout @ 0g Yout @ -1g Zout @ 0g Xout @ 1g Yout @ 0g Zout @ 0g Xout @ 0g Yout @ 1g Zout @ 0g Xout @ -1g Yout @ 0g Zout @ 0g LL PD LR Side View FRONT Xout @ 0g Yout @ 0g Zout @ 1g BACK Xout @ 0g Yout @ 0g Zout @ -1g |
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