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| 型号： | MC68HC05V7FN |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 48/170页 |
| 文件大小： | 589K |
| 代理商： | MC68HC05V7FN |
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SECTION 15: MESSAGE DATA LINK CONTROLLER
MOTOROLA
Page 127
MC68HC05V7 Specification Rev. 1.0
15.6.3
PINS
There are seven pins associated with the MDLC module. Figure 15-16:
Interface Outline gives an example mechanization. A brief description of each pin follows.
15.6.3.1
REXT1, REXT2
These are external biasing resistor tie points for transmitter waveshaping and they must be
referenced to the VDD pin through lines which are as low impedance and low noise as
possible to ensure consistent operation.
15.6.3.2
BUS
This is the half-duplex data line for J1850 communications.
15.6.3.3
LOAD
This is the switched ground connection for the J1850 bus, via an RC load.
15.6.3.4
VBATT
This is the source for battery voltage for the MDLC. This power supply pin must be
protected against transient and fault conditions.
To protect against loss of battery, a low voltage protect circuit within the transceiver
disables drive from the BUS pin to prevent erroneous messages from being transmitted.
Nominal trip points are VTIVB Volts on VBATT and VRIVD Volts on VCCA.
15.6.3.5
VCCA
This is the MDLC analog transceiver power supply input and is nominally 5V. This supply
must be kept as low impedance and low noise as possible. It may be supplied from a
different voltage regulator source than VDD.
Whenever the voltage on this pin rises from zero to its nominal operating value, the
Physical Interface detects this power-on condition and resets its control circuits. Also,
whenever the voltage on this pin falls below its minimum operating value, the MDLC analog
circuitry will return to its reset state.
15.6.3.6
VSSA2
This is the Physical Interface power supply ground. This supply must be kept as low
impedance and low noise as possible. It must be connected directly to the same grounding
point that the main MCU Vss uses.
15.6.3.7
Decoupling
Good supply decoupling, as close as possible to the supply pins, is absolutely essential to
guarantee correct operation, minimize RFI and maximize analog performance. MDLC and
non-MDLC supply lines should be kept separate to minimize interaction. Emphasis should
be placed on keeping supply and ground line impedances as low as possible, with
preference given to ground lines if some compromise is necessitated. Ground planes and
wide, short, PCB traces can help significantly here. Decoupling capacitors should be of low
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