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參數(shù)資料
型號(hào)： KIT33742DWEVB
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 19/71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
26
Freescale Semiconductor
33742
FUNCTIONAL DEVICE OPERATION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL DEVICE OPERATION
SUPPLY VOLTAGE AT VSUP
The 33742 receives its operating voltage via the VSUP pin. An external diode is needed in series with the VSUP pin and the
supply voltage to protect the SBC against negative transients or from a reverse battery situation that can occur in a vehicle
application. The 33742 will operate from a supply voltage input as low as 4.5 VDC to as high as 27 VDC. The later voltage is
often encountered during a vehicle jump-start.
The VSUP pin can tolerate automotive transient conditions such as load dump to 40 V. The SBC is able to detect when VSUP
falls below 3.0 V typical. This under-voltage state is detected and retained in the parts Mode Control Register (MCR) as the
BATFAIL bit. This detection capability is available across all operating modes.
Note For a detailed description of all the registers mentioned in this section, refer to the section titled SPI Interface And
The SBC incorporates a VSUP level early warning function, which provides a maskable interrupt if the VSUP voltage level falls
below 6.0 V typical. Hysteresis is used to reduce false detections. The early warning function works only in Normal and Standby
operation modes. An under-voltage at the VSUP pin is reported in the Input/Output Register (IOR).
VDD REGULATOR
The VDD regulator provides a 5.0 V low dropout voltage capable of supplying up to 200 mA with monitoring circuitry for under-
voltage detection and a reset function. The VDD regulator is protected against over-current and short-circuit conditions. It has
over-temperature detection and will set warning flags (bit VDDTEMP in the MCR and INTR registers) and has over-temperature
shutdown with hysteresis.
V2 REGULATOR
The V2 regulator feature provides for a second 5.0 VDC voltage source The internal V2 circuitry will drive an external series
pass transistor, substantially increasing the available supply current. Two pins, the V2 and the V2CTRL, are used to sense and
drive the series pass transistor. The output voltage is 5.0 V and tracks the VDD regulator. The MJD32C transistor is
recommended for use as the external pass device. Other PNP transistors can be used but depending on the device’s gain, an
external resistor-capacitor network might be needed. V2 is also the supply voltage for the on-board CAN module. An under-
voltage condition for the V2 voltage is reported in the IOR Register (bit V2LOW set to logic [1] if V2 falls below 4.0 V typical).
HS VSUP SWITCH OUTPUT
The HS output is a 2.0
typical switch tied to the VSUP pin. It can power or bias external switches and their associated pull-
up or put-downs or other circuitry. An example is biasing a set of switches connected to the L0:L3 wake-up input pins. The HS
VSUP output current is limited to 200 mA and is protected against short-circuits conditions and will report an over-temperature
shutdown condition (bit HSOT in the IOR register and bit HSOT-V2LOW in the INTR register).
The HS output “on” state is set by the HSON bit in the IOR register. A cyclic mode of operation can be implemented using an
internal timer in the Sleep and Stop operating modes. It can also be turned on in Normal or Standby modes to drive loads or
supply peripheral components. No internal protection circuitry is provided, however. Dedicated chip protection circuitry is required
for inductive load applications. The HS output pin should not go below -0.3 V.
BATTERY FAIL EARLY WARNING
Refer to the previous discussion under the heading, Supply Voltage at VSUP.
INTERNAL CLOCK
The 33742 has an internal clock used to generate all timings (reset, watchdog, cyclic wake-up, filtering time, etc.). There are
two on-board oscillators: a higher accuracy (±12 percent) oscillator used in Normal Request, Normal, and Standby modes, and
a lower accuracy (±30 percent) oscillator used during Sleep and Stop modes.
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