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MCP2004A bảng dữ liệu(PDF) 9 Page - Microchip Technology |
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MCP2004A bảng dữ liệu(HTML) 9 Page - Microchip Technology |
9 / 34 page © 2010-2011 Microchip Technology Inc. DS22230D-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. 1.5.2 CS (CHIP SELECT) 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 Figure 1-2 – Figure 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 800K 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. 1.5.4 FAULT/TXE This pin is only available on the MCP2004/2004A. This pin is bidirectional and allows disabling of the transmitter, as well as fault reporting related to disabling the transmitter. This pin is an open-drain output, with states as defined in TABLE 1-3: “FAULT/ TXE Truth Table”. The transmitter is disabled whenever this pin is low (‘0’), either from an internal Pin Name 8-Pin PDIP, SOIC 8-Pin DFN MCP2003/2003A MCP2004/2004A Normal Operation Normal Operation RXD 1 1 Receive Data Output (OD), HV tolerant Receive Data Output (OD), HV tol- erant CS 2 2 Chip Select (TTL), HV tolerant Chip Select/Local WAKE (TTL), HV tolerant WAKE (MCP2003/2003A only) FAULT/TXE (MCP2004/2004A only) 3 3 Wake up, HV tolerant Fault Detect Output (OD) Transmitter Enable (TTL) HV tolerant TXD 4 4 Transmit Data Input (TTL), HV tolerant Transmit Data Input (TTL), HV tol- erant 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. |
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