mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 177

• Manufacturer Part Number: mc68hc908jb16
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

11.7 Hardware Description
11.7.1 Voltage Regulator
11.7.2 USB Transceiver
MC68HC908JB16
Freescale Semiconductor
—
Rev. 1.1
The USB module as previously shown in
functional blocks: the low-speed USB transceiver, the USB control logic,
and the USB registers. The following details the function of the regulator,
transceiver, and control logic. See
register settings.
The USB data lines are required by the USB specification to have an
output voltage between 2.8V and 3.6V. The data lines also are required
to have an external 1.5kΩ pull-up resistor connected between a data line
and a voltage source between 3.0V and 3.6V.
worst case electrical connection for the voltage regulator.
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 receiver.
TRANSCEIVER
4.0V TO 5.5V
REGULATOR
LOW-SPEED
Universal Serial Bus Module (USB)
3.3V
Figure 11-10. Regulator Electrical Connections
D+
D–
R1
USB DATA LINES
R1 = 1.5kΩ ±5%
R2 = 15kΩ ±5%
11.8 I/O Registers
USB CABLE
Figure 11-2
Universal Serial Bus Module (USB)
Figure 11-10
R2
contains three
for details of
R2
Technical Data
shows the
HOST
HUB
OR
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