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MCP2004 bảng dữ liệu(PDF) 9 Page - Microchip Technology |
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MCP2004 bảng dữ liệu(HTML) 9 Page - Microchip Technology |
9 / 32 page 2010 Microchip Technology Inc. DS22230A-page 9 MCP2003/4 TABLE 1-2: FAULT/TXE TRUTH TABLE 1.5.5 TRANSMIT DATA INPUT (TXD) The Transmit Data Input pin has an internal pull-up. The LIN pin is low (dominant) when TXD is low, and high (recessive) when TXD is high. For extra bus security, TXD is internally forced to ‘1’ whenever the transmitter is disabled regardless of external TXD voltage. 1.5.5.1 TXD Dominant Timeout If TXD is driven low longer than approximately 10 ms, the LBUS pin is switched to Recessive mode and the part enters TOFF mode. This is to prevent the LIN node from permanently driving the LIN Bus dominant. The transmitter is re-enabled on the TXD rising edge. 1.5.6 GROUND (VSS) This is the Ground pin. 1.5.7 LIN BUS (LBUS) The bidirectional LIN Bus pin (LBUS) is controlled by the TXD input. LBUS has a current limited open collector output. To reduce EMI, the edges during the signal changes are slope controlled and include corner rounding control for both falling and rising edges. The internal LIN receiver observes the activities on the LIN bus, and matches the output signal RXD to follow the state of the LBUS pin. 1.5.7.1 Bus Dominant Timer The Bus Dominant Timer is an internal timer that deac- tivates the LBUS transmitter after approximately 25 milliseconds of dominant state on the LBUS pin. The timer is reset on any recessive LBUS state. The LIN bus transmitter will be re-enabled after a recessive state on the LBUS pin as long as CS is high. Disabling can be caused by the LIN bus being exter- nally held dominant, or by TXD being driven low. Addi- tionally, on the MCP2004, the FAULT pin will be driven low to indicate the Transmitter Off state. 1.5.8 BATTERY (VBB) This is the Battery Positive Supply Voltage pin. 1.5.9 VOLTAGE REGULATOR ENABLE OUTPUT (VREN) This is the External Voltage Regulator Enable pin. Open source output is pulled high to VBB in all modes, except Power Down. 1.5.10 EXPOSED THERMAL PAD (EP) Do not electrically connect, or connect to Vss. TXD In RXD Out LINBUS I/O Thermal Override FAULT/TXE Definition External Input Driven Output LH VBB OFF H L FAULT, TXD driven low, LINBUS shorted to VBB (Note 1) HH VBB OFF H H OK L L GND OFF H H OK H L GND OFF H H OK, data is being received from the LINBUS xx VBB ON H L FAULT, Transceiver in thermal shutdown xx VBB x L x NO FAULT, the CPU is commanding the transceiver to turn off the transmitter driver Legend: x = don’t care Note 1: The FAULT/TXE is valid after approximately 25 µs after TXD falling edge. This is to eliminate false fault reporting during bus propagation delays. |
Số phần tương tự - MCP2004 |
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Mô tả tương tự - MCP2004 |
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