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MCP2025T-330E/SN bảng dữ liệu(PDF) 6 Page - Microchip Technology |
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MCP2025T-330E/SN bảng dữ liệu(HTML) 6 Page - Microchip Technology |
6 / 38 page MCP2025 DS20002306B-page 6 2012-2014 Microchip Technology Inc. 1.2 Pin Descriptions The descriptions of the pins are listed in Table 1-2. 1.2.1 BATTERY POSITIVE SUPPLY VOLTAGE (VBB) Battery Positive Supply Voltage pin. An external diode is connected in series to prevent the device from being reversely powered (refer to Figure 1-7). 1.2.2 CHIP SELECT AND LOCAL WAKE-UP INPUT (CS/LWAKE) Chip Select and Local Wake-Up Input pin (TTL level, high-voltage tolerant). This pin controls the device state transition. Refer to Figure 1-1. An internal pull-down resistor will keep the CS/LWAKE pin low to ensure that no disruptive data will be present on the bus while the microcontroller is executing a Power-On Reset and I/O initialization sequence. When CS/LWAKE is ‘1’, a weak pull-down (~600 kΩ) is used to reduce current. When CS/LWAKE is ‘0’, a stronger pull-down (~300 kΩ) is used to maintain the logic level. This pin may also be used as a local wake-up input (see Figure 1-7). The microcontroller will set the I/O pin to control the CS/LWAKE. An external switch or another source can then wake up both the transceiver and the microcontroller. 1.2.3 GROUND (VSS) Ground pin. 1.2.4 LIN BUS (LBUS) LIN Bus pin. LBUS is a bidirectional LIN bus interface pin and is controlled by the signal TXD. It has an open collector output with a current limitation. To reduce electromagnetic emission, the slopes during signal changes are controlled and the LBUS pin has corner-rounding control for both falling and rising edges. The internal LIN receiver observes the activities on the LIN bus and generates the output signal RXD that follows the state of the LBUS. A 1st degree 160 kHz low-pass input filter optimizes electromagnetic immunity. 1.2.5 RECEIVE DATA OUTPUT (RXD) Receive Data Output pin. The RXD pin is a standard CMOS output pin and it follows the state of the LBUS pin. 1.2.6 TRANSMIT DATA INPUT (TXD) Transmit Data Input pin (TTL level, HV-compliant, adaptive pull-up). The transmitter reads the data stream on the TXD pin and sends it to the LIN bus. The LBUS pin is low (dominant) when TXD is low, and high (recessive) when TXD is high. TXD is internally pulled-up to approximately 4.2V. When TXD is ‘0’, a weak pull-up (~900 kΩ) is used to reduce current. When TXD is ‘1’, a stronger pull-up (~300 kΩ) is used to maintain the logic level. A series reverse-blocking diode allows applying TXD input voltages greater than the internally generated 4.2V and renders the TXD pin HV-compliant up to 30V (see MCP2025 Block Diagram). TABLE 1-2: PIN FUNCTION TABLE Pin Name Pin Number Pin Type Description 8-lead PDIP 4x4 DFN VBB 11 Power Battery CS/LWAKE 2 2 TTL input, HV-tolerant Chip Select and Local Wake-up Input VSS 33 Power Ground LBUS 4 4 I/O, HV LIN Bus RXD 5 5 Output Receive Data Output TXD 6 6 Input, HV-tolerant Transmit Data Input RESET 7 7 Open-drain output, HV-tolerant Reset Output VREG 8 8 Output Voltage Regulator Output EP — 9 — Exposed Thermal Pad Note: CS/LWAKE should NOT be tied directly to the VREG pin, as this could force the MCP2025 into Operation mode before the microcontroller is initialized. |
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