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MCP2021 Datasheet(PDF) 6 Page - Microchip Technology |
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MCP2021 Datasheet(HTML) 6 Page - Microchip Technology |
6 / 52 page MCP2021/2/1P/2P DS22018F-page 6 © 2005-2012 Microchip Technology Inc. FIGURE 1-1: Thermal Shutdown State Diagrams. 1.3 Modes of Operation For an overview of all operational modes, please refer to Table 1-1. 1.3.1 POWER-ON RESET MODE Upon application of VBB, the device enters Power-on Reset mode (POR). During this mode, the part main- tains the digital section in a Reset mode and waits until the voltage on pin VBB rises above the “ON” threshold (Typ. 5.75V) to enter to the Ready mode. If during the operation, the voltage on pin VBB falls below the “OFF” threshold (Typ. 4.25V), the part comes back to the POR mode. 1.3.2 POWER-DOWN MODE In the Power-Down mode, the transmitter and the voltage regulator are off. Only the receiver wake-up from LIN bus section, and the CS/LWAKE pin wake-up circuits are in operation. This is the lowest power mode. If pin CS/LWAKE goes to a high level during Power- Down mode, the device immediately enters Ready mode and enables the voltage regulator; and after the output has stabilized (approximately 0.3 ms to 1.2 ms), the device goes to Operation mode or Transmitter-Off mode (see Figure 1-2 for MCP2021/2 and Figure 1-3 for MCP2021P/2P). LIN bus activity will also change the device from Power-Down mode to Ready mode. MCP2021/2 wakes up on dominant level of LIN bus, and MCP2021P/2P on a falling edge that follows a domi- nant level lasting 20 µs of time. The Power-Down mode can be reached through either Operation mode or Transmitter-Off mode. 1.3.3 READY MODE Upon entering Ready mode, the voltage regulator and receiver-threshold-detect circuit are powered up. The transmitter remains in off state. The device is ready to receive data as soon as the regulator is stabilized, but not to transmit. If a microcontroller is being driven by the voltage regulator output, it will go through a POR and initialization sequence. The LIN pin is in the reces- sive state for MCP2021/2 and in floating state for MCP2021P/2P. The device will stay in Ready mode until the output of the voltage regulator has stabilized and the CS/LWAKE pin is true (‘1’). After VREG is stable and CS/LWAKE is high, MCP2021/2 will enter Operation mode; and MCP2021P/2P will enter either Operation mode or Transmitter-Off mode, depending on the level of the FAULT/TXE pin (refer to Figure 1-3). 1.3.4 OPERATION MODE In this mode, all internal modules are operational. The device will go into the Power-Down mode on the falling edge of CS/LWAKE. For the MCP2021P/2P devices, the pull-up resistor is switched on only in this mode. Operation Mode Transmitter Shutdown LIN Bus Voltage Shutdown Regulator Output Temperature <SHUTDOWNTEMP Overload to VBB Overload Temperature <SHUTDOWNTEMP Note: The above time interval <1.2 ms assumes 12V VBB input and no thermal shutdown event. |
Similar Part No. - MCP2021 |
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Similar Description - MCP2021 |
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