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MCP201TIMF bảng dữ liệu(PDF) 7 Page - Microchip Technology |
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MCP201TIMF bảng dữ liệu(HTML) 7 Page - Microchip Technology |
7 / 40 page © 2007 Microchip Technology Inc. DS21730F-page 7 MCP201 1.5 Pin Descriptions TABLE 1-3: MCP201 PINOUT OVERVIEW 1.5.1 RECEIVE DATA OUTPUT (RXD) The Receive Data Output pin is a standard CMOS output and follows the state of the LIN pin. The LIN receiver monitors the state of the LIN pin and generates the output signal RXD. 1.5.2 CS/WAKE Chip Select Input pin. This pin controls whether the part goes into READY1 or READY mode at power-up. The internal pull-down resistor will keep the CS/WAKE 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 I/O initialization sequence. The pin must see a low-to-high transition to activate the transmitter. After CS/WAKE transitions to ‘1’, the transmitter is enabled. If CS/WAKE = ‘0’, the device is in Ready1 mode on power-up or in Low-Power mode. In Low- Power mode, the voltage regulator is shut down, the transmitter driver is disabled and the receiver logic is enabled. An external switch (see Figure 1-2) can then wake up both the transceiver and the microcontroller. An external-blocking diode and current-limiting resistor are necessary to protect the microcontroller I/O pin. 1.5.3 POWER OUTPUT (VREG) Positive Supply Voltage Regulator Output pin. 1.5.4 TRANSMIT DATA INPUT (TXD) The Transmit Data Input pin has an internal pull-up to VREG. The LIN pin is low (dominant) when TXD is low, and high (recessive) when TXD is high. In case the thermal protection detects an over-temper- ature condition while the signal TXD is low, the transmitter is shutdown. The recovery from the thermal shutdown is equal to adequate cooling time. 1.5.5 GROUND (VSS) Ground pin. 1.5.6 LIN The bidirectional LIN bus Interface pin is the driver unit for the LIN pin and is controlled by the signal TXD. LIN has an open collector output with a current limitation. To reduce EMI, the edges during the signal changes are slope-controlled. 1.5.7 BATTERY (VBAT) Battery Positive Supply Voltage pin. This pin is also the input for the internal voltage regulator. 1.5.8 FAULT/SLPS FAULT Detect Output, Slope Select Input. This pin is usually in Output mode. Its state is defined as shown in Table 1-5. The state of this pin is internally sampled during power- on of VBAT. Once VBAT has reached a stable level, (approximately 6 VDC) and VREG is stable at 4.75 to 5.25 VDC, the state of this pin selects which slew rate profile to apply to the LIN output. It is only during this time that the pin is used as an input (the output driver is off during this time). The slope will stay selected until the next VBAT power-off/power-on sequence, regard- less of any power-down, wake-up or SLEEP events. Only a VBAT rising state will cause a sampling of the FAULT/SLPS pin. The Slope selection will be made irrespective of the state of any other pin. The FAULT/SLPS pin is connected to either VREG or VSS through a resistor (approximately 100 k Ω) to make the slope selection. This large resistance allows the FAULT indication function to overdrive the resistor in normal operation mode. If the FAULT/SLPS is high (‘1’), the normal slope shap- ing is selected (dv/dt = 2 V/µs). If FAULT/SLPS is low (‘0’) during this time, the alternate slope-shaping is selected (dv/dt = 4 V/µs). This mode can be used if a user desires to run at a faster slope. This mode is not LIN compliant. Devices Bond Pad Name Function 8-Pin PDIP/ SOIC/DFN Normal Operation 1 RXD Receive Data Output (CMOS output) 2 CS/WAKE Chip Select (TTL-HV input) 3VREG Power Output 4 TXD Transmit Data Input (TTL) 5VSS Ground 6 LIN LIN bus (bidirectional- HV) 7VBAT Battery 8FAULT/SLPS Fault Detect Output, Slope Select Input Legend: TTL = TTL input buffer, HV = High Voltage (VBAT) Note: On POR, the MCP201 enters Ready or Ready1 mode (see Figure 1-1). In order to enter Operational mode, the MCP201 has to see one rising edge on CS/WAKE 600 µs after the voltage regulator reaches 5V. |
Số phần tương tự - MCP201TIMF |
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Mô tả tương tự - MCP201TIMF |
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