INTRODUCTION FUNCTIONAL DESCRIPTION INTRODUCT" />
參數(shù)資料
型號(hào)： KIT33742DWEVB
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 15/71頁(yè)
文件大?。?/td> 0K
描述： KIT FOR 33742 SBC WITH EHSCAN
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，CAN 控制器
已用 IC / 零件： MC33742
相關(guān)產(chǎn)品： MC33742DW-ND - IC SYSTEM BASE W/LIN 28-SOIC
MC33742DWR2-ND - IC SYSTEM BASE W/LIN 28-SOIC
MC33742SDW-ND - IC SYSTEM BASE W/LIN 28-SOIC
MC33742SDWR2-ND - IC SYSTEM BASE W/LIN 28-SOIC
Analog Integrated Circuit Device Data
22
Freescale Semiconductor
33742
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 33742 and the 33742S are system basis chips (SBCs) dedicated to automotive applications. Their functions include the
following:
One fully protected 5.0 V voltage regulator with 200 mA total output current capability available at the VDD pin.
VDD regulator under-voltage reset function, programmable window or time-out software watchdog function.
Internal driver (V2) for an external series pass transistor to implement a second 5.0 V voltage regulator.
Two running modes: Normal and Standby modes set by the system microcontroller.
Sleep and Stop modes low power operating modes to reduce an application’s current consumption while providing a wake-
up capability from the CAN interface, L3:L0 wake-up inputs, or from a timer wake-up.
Programmable wake-up input and cyclic sense wake-ups.
CAN high-speed physical bus interface with TXD and RXD fault diagnostic capability and enhanced protection features.
An SPI interface for use in communicating with a MCU and Interrupt outputs to report SBC status, perform diagnostics, and
report wake-up events.
FUNCTIONAL PIN DESCRIPTION
RECEIVE AND TRANSMIT DATA (RXD AND TXD)
The RXD and TXD pins (receive data and transmit data pins, respectively) are connected to a microcontroller’s CAN protocol
handler. TXD is an input and controls the CANH and CANL line state (dominant when TXD is LOW, recessive when TXD is
HIGH). RXD is an output and reports the bus state (RXD LOW when CAN bus is dominant, HIGH when CAN bus is recessive).
The RXD terminal is a push-pull structure between the V2 pin and GND.
Voltage Digital Drain (VDD)
The VDD pin is the output pin of the 5.0 V internal regulator. It can deliver up to 200 mA. This output is protected against over-
current and over-temperature. It includes an over-temperature pre-warning flag, which is set when the internal regulator
temperature exceeds 130 °C typical. When the temperature exceeds the over-temperature shutdown (170 °C typical), the
regulator is turned off.
VDD includes an under-voltage reset circuitry, which sets the RST pin LOW when VDD is below the under-voltage reset
threshold.
RESET OUTPUT (RST)
The RESET pin RST, is an output that is set LOW when the device is in reset mode. The RST pin is set HIGH when the device
is not in reset mode. RST includes an internal pull-up current source. When RST is LOW, the sink current capability is limited,
allowing RST to be shorted to 5.0 V for software debug or software download purposes.
INTERRUPT OUTPUT (INT)
The Interrupt pin INT, is an output that is set LOW when an interrupt occurs. INT is enabled using the Interrupt Register (INTR).
When an interrupt occurs, INT stays LOW until the interrupt source is cleared.
INT output also reports a wake-up event by a 10
s typical pulse when the device is in Stop mode.
VOLTAGE SOURCE 2 (V2)
The V2 pin is the input sense for the V2 regulator. It is connected to the external series pass transistor. V2 is also the 5.0 V
supply of the internal CAN interface. It is possible to connect V2 to an external 5.0 V regulator or to the VDD output when no
external series pass transistor is used. In this case, the V2CTRL pin must be left open. Refer to Figure 31, SBC Typical
VOLTAGE SOURCE 2 CONTROL (V2CTRL)
The V2CTRL pin is the output drive pin for the V2 regulator connected to the external series pass transistor.
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