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33784 Datasheet(PDF) 11 Page - Freescale Semiconductor, Inc |
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33784 Datasheet(HTML) 11 Page - Freescale Semiconductor, Inc |
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11 / 30 page  Analog Integrated Circuit Device Data Freescale Semiconductor 11 33784 FUNCTIONAL DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION FUNCTIONAL INTERNAL BLOCK DESCRIPTION Functional Internal Block Diagram SUPPLY VOLTAGE RECTIFIER There is an on-chip rectifier, which allows power and communications to be delivered to the 33784 over the bus. The rectifier lies between BUSIN and H_CAP. During the idle state of the bus, the rectifier allows the bus to charge an external storage capacitor attached to H_CAP. During signaling, the rectifier isolates H_CAP from the bus to prevent the bus from draining the external capacitor while signaling. The capacitor then supplies power to the 33784 during signaling. The signaling time and the size of the external capacitor must be selected so that the voltage on HCAP does not drop below 6.77V during signaling. 5.0V REGULATOR An on-chip 5V regulator supplies internal power for the 33784 and also supplies power to external devices, such as accelerometers via the REGOUT pin. A bypass capacitor is required on the REGOUT pin to keep the regulator stable. All current supplied by the regulator is derived from the external capacitor attached to H_CAP. UNDER-VOLTAGE DETECTOR The under-voltage detector issues a power-ON reset (POR) signal during power-up and power-down of the 33784. It also monitors the voltage on HCAP and REGOUT and issues a reset when either of these pins fall below their respective POR thresholds. The reset signal is filtered to prevent glitches on HCAP or REGOUT from causing an erroneous reset. Any time the 33784 is reset, the device will need to be re-initialized before it will respond to further commands. LOGIC AND CONTROL RECEIVER The receiver detects the voltage on BUSIN and senses when the bus is idle and when it is signaling. Communication on the bus always begins when the voltage on BUSIN drops below the frame threshold. This change from idle mode to signal mode is sensed by the receiver and is interpreted as the start of an incoming word. The first bit in the word begins when the bus voltage drops below the Signal threshold. This starts a counter in a serial decoder, which essentially measures the amount of time that the bus voltage is below the signal threshold. When the bus MC33784 - Functional Diagram Supply Voltage Sensing & Control Bus switches Bus Switches Power Stage Supply Voltage Rectifier Sensing & Control Power Stage Clock Transmitter Analog to Digital Converter Control Logic Receiver 5.0V Regulator Under-voltage Detector |
Similar Part No. - 33784_09 |
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Similar Description - 33784_09 |
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