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BMA250 Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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BMA250 Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
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11 / 74 page  BMA250 Data sheet Bosch Sensortec Rev. 1.15 Page 11 / not for publishing 31 - May - 2012 © Bosch Sensortec GmbH reserves all rights even in the event of industrial property rights. We reserve all rights of disposal such as as copying and passing on to third parties. BOSCH and the symbol are registered trademarks of Robert Bosch GmbH, Germany. Note: Specifications within this document are subject to change without notice. both supply voltages. In case the I²C interface shall be used, a direct electrical connection between VDDIO supply and the PS pin is needed in order to ensure reliable protocol selection (see section 4.2 Operational modes). 4.2 Operational modes Depending on the configuration the BMA250 is able to operate in two different operational modes: General mode: The device is acting as a slave on a digital interface (SPI or I²C) and is controlled by the external bus master (e.g. µC). The master gets measurement data and status information from the device through the digital interface. In particular, the master can configure the interrupt controller and read out the interrupt status registers. Moreover, it can freely configure and use the two interrupt pins (INT1, INT2). Several interrupts may be enabled in parallel. Dedicated mode: The dedicated mode allows the sensor to be operated as a stand- alone device in a simple µC-less system without abandon of the interrupt functionality. No digital interface is needed and, as a consequence, no measurement data can be read from the device. Instead of the digital interface the internal interrupt engine with its default setting is used. The interrupt status is mapped onto dedicated output pins. One out of three different sub-modes can be chosen: A) orientation recognition, B) tap sensing or C) slope (any-motion) detection. Only one interrupt at a time can be assigned. The selection of the operational mode is done during start-up or reset by the state of the PS pin. If PS is floating, the dedicated mode is selected. A defined digital state selects the general mode. All pads are in input mode (no output driver active) during the start-up sequence until the operational mode and, in case of the general mode, the interface type is selected. The start-up sequence is run after power-up and after reset. Figure 2 illustrates the selection of the different operational modes: reset yes no PS floating? General Mode Dedicated Mode check configuration pins Table 4 & Table 5 PS = 0? General Mode with I²C General Mode with SPI One or more interrupts can be configured via I²C One or more interrupts can be configured via SPI Sub-Mode B Tap Sens. Sub-Mode A Orientation Sens. Sub-Mode C Slope Sens. Tap sensing Interrupt is enabled Orientation Interrupt is enabled Any-Motion Interrupt is enabled yes no Figure 2: Operational mode selection |
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