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MCP2003 bảng dữ liệu(PDF) 9 Page - Microchip Technology |
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MCP2003 bảng dữ liệu(HTML) 9 Page - Microchip Technology |
9 / 34 page 2010-2014 Microchip Technology Inc. DS20002230F-page 9 MCP2003/4/3A/4A 1.5 Pin Descriptions TABLE 1-2: PINOUT DESCRIPTIONS 1.5.1 RECEIVE DATA OUTPUT (RXD) The Receive Data Output pin is an open drain (OD) output and follows the state of the LIN pin, except in Power Down mode. 1.5.1.1 RXD Monitoring The RXD pin is internally monitored. It has to be at a high level (> 2.5V typical) while LBUS is recessive. Otherwise, an internal fault will be created and the device will transition to Transmitter Off mode. On the MCP2004/2004A, the FAULT/TXE pin will be driven low to indicate the Transmitter Off state. 1.5.2 CHIP SELECT (CS) This is the Chip Select Input pin. An internal pull-down resistor will keep the CS pin low. This is done to ensure that no disruptive data will be present on the bus while the microcontroller is executing a Power-on Reset and an I/O initialization sequence. The pin must detect a high level to activate the transmitter. An internal Low- Pass filter, with a typical time constant of 10 µs, prevents unwanted wake-up (or transition to Power Down mode) on glitches. If CS = 0 when the VBB supply is turned on, the device goes to Ready mode as soon as internal voltages sta- bilize, and stays there as long as the CS pin is held low (0). In Ready mode, the receiver is on, and the LIN transmitter driver is off. If CS = 1 when the VBB supply is turned on, the device will proceed to Operation mode, or TXOFF (refer to Figures 1-2 to 1-5), as soon as internal voltages stabilize. This pin may also be used as a local wake-up input (refer to Example 1-1). In this implementation, the microcontroller I/O controlling the CS should be converted to a high-impedance input allowing the internal pull-down resistor to keep CS low. An external switch, or other source, can then wake-up both the transceiver and the microcontroller (if powered). Refer to Section 1.3 “Modes of Operation”, for detailed operation of CS. 1.5.3 WAKE-UP INPUT (WAKE) This pin is only available on the MCP2003/2003A. The WAKE pin has an internal 800 kΩ pull-up to VBB. A falling edge on the WAKE pin causes the device to wake from Power-Down mode. Upon waking, the MCP2003/3A will enter Ready mode. Pin Name 8-Lead PDIP, SOIC 4x4 DFN MCP2003/2003A MCP2004/2004A Normal Operation Normal Operation RXD 1 1 Receive Data Output (OD), HV tolerant Receive Data Output (OD), HV tolerant CS 2 2 Chip Select (TTL), HV tolerant Chip Select/Local WAKE (TTL), HV tolerant WAKE (MCP2003/2003A only) 3 3 Wake-up, HV tolerant Fault Detect Output (OD) Transmitter Enable (TTL) HV tolerant FAULT/TXE (MCP2004/2004A only) TXD 4 4 Transmit Data Input (TTL), HV tolerant Transmit Data Input (TTL), HV tolerant VSS 5 5 Ground Ground LBUS 6 6 LIN Bus (bidirectional) LIN Bus (bidirectional) VBB 7 7 Battery Positive Battery Positive VREN 8 8 Voltage Regulator Enable Output Voltage Regulator Enable Output EP — 9 Exposed Thermal Pad. Do not electrically connect or connect to Vss Exposed Thermal Pad. Do not electrically connect or connect to Vss Legend: TTL = TTL Input Buffer; OD = Open-Drain Output Note: It is not recommended to tie CS high as this can result in the device entering Operation mode before the microcontroller is initialized and may result in unintentional LIN traffic. |
Số phần tương tự - MCP2003_14 |
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Mô tả tương tự - MCP2003_14 |
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