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L9800 データシート(PDF) 20 Page - STMicroelectronics |
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L9800 データシート(HTML) 20 Page - STMicroelectronics |
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20 / 55 page  6.1.4 Active mode The active mode is needed when there are loads to drive. Voltage levels of VDDIO and VBATT influence the behavior as described at the beginning of Section 6: Power supply. The current consumption is described through these two parameters: IVDDIO(ACTIVE) and IVBATT(ACTIVE). In case CFG_1.ACT is set to “1”, the device enters in active mode and remains in this state independently of the status of input pins, internal PWM generators, and PWM_SPI.OUTn bits. If CFG_1.ACT is set to “0”, the device comes back to idle mode as soon as all inputs pins are set to “low”, PWM_SPI.OUTn bits are set to “0” and in case of turn off command by PWM generators if properly configured. If CFG_1.ACT is set to “1”, the device remains in active mode independently of the status of input pins, PWM_SPI.OUTn register and PWM generators registers status. An undervoltage condition on VDDIO supply brings the device into idle mode if IN0 and IN1 are set to “low”. If CFG_1.ACT is set to “0”, the registers MAP_IN0, MAP_IN1 (together with the input pins) and MAP_PWM (together with the related PWM duty cycle) have to be correctly configured to switch to active mode. 6.1.5 Limp-home mode The L9800 is brought into limp-home mode when one of the two input pins is asserted (this means the enabling of the channel connected to it) and also the idle pin is set to "low". The SPI communication is possible only in read- only mode (SPI registers can be read but cannot be written). If the application is used in limp-home mode, in IDLE and ACTIVE the channels 2 and 3 cannot be used in BIM mode. More in detail: • MODE bits are set to “01B” (limp-home mode). • Overload and overtemperature diagnostics on channel 2 and 3 are available and the related DIAG_OVC_OVT bits can be read. • DIAG_OPL_OFF and DIAG_SHG bits, referred to diagnostics executed during a previous active phase, can be read via SPI request. During the transition from limp-home mode to sleep, the complete set of L9800 registers is not accessible for writing until it remains in the limp-home state and is set to their default values. Refer to Section 6.1: Operating modes for a detailed description of supply voltage conditions required to switch on channels 2 and 3 during limp-home, the other channels are kept off. 6.1.6 Power supply transition The time to turn on a channel is defined as tON both in active and limp-home mode. In all other cases, the transition time is reported as shown in Figure 13. L9800 Power supply DS14041 - Rev 2 page 20/55 |
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