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參數(shù)資料
| 型號： | MC68HC05JB4DW |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 3 MHz, MICROCONTROLLER, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 110/134頁 |
| 文件大?。?/td> | 2440K |
| 代理商： | MC68HC05JB4DW |
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February 24, 1999
GENERAL RELEASE SPECIFICATION
MC68HC05JB4
UNIVERSAL SERIAL BUS MODULE
REV 2
USB registers. The following will detail the function of the regulator, transceiver
and control logic. See Section 10.5 for the register discussion.
10.4.1 Voltage Regulator
The USB data lines are required by the USB Specication to have a maximum
output voltage between 2.8V and 3.6V. The data lines are also required to have an
external 1.5K
pullup resistor connected between a data line and a voltage
source between 3.0V and 3.6V. Since the power provided by the USB cable is
specied to be between 4.4V and 5.0V, an on-chip regulator is used to drop the
voltage to the appropriate level for sourcing the USB transceiver and external
pullup resistor. An output pin driven by the regulator voltage is provided to source
the 1.5K
external resistor. Figure 10-11 shows the worst case electrical
connection for the voltage regulator.
Figure 10-11. Regulator Electrical Connections
10.4.2 USB Transceiver
The USB transceiver provides the physical interface to the USB D+ and D– data
lines. The transceiver is composed of two parts: an output drive circuit and a
differential receiver.
10.4.2.1 Output Driver Characteristics
The USB transceiver uses a differential output driver to drive the USB data signal
onto the USB cable. The static output swing of the driver in its low state is below
the VOL of 0.3 V with a 1.5 k load to 3.6 V and in its high state is above the VOH
of 2.8 V with a 15 k
load to ground. The output swings between the differential
high and low state are well balanced to minimize signal skew. Slew rate control on
the driver is used to minimize the radiated noise and cross talk. The driver’s
outputs support three-state operation to achieve bi-directional half duplex
operation. The driver can tolerate a voltage on the signal pins of –0.5 V to 3.8 V
LS
Transceiver
3.3V
R2
R1
R1 = 1.5K
±5%
R2 = 15K
±5%
Regulator
USB Data Lines
Host
or
Hub
USB Cable
4.4V
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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