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68HC705JB3 Datasheet(PDF) 79 Page - Freescale Semiconductor, Inc

Part # 68HC705JB3
Description  8-bit microcontroller units (MCUs)
PDF  134 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705JB3 Datasheet(HTML) 79 Page - Freescale Semiconductor, Inc

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November 5, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05JB3
UNIVERSAL SERIAL BUS MODULE
MOTOROLA
REV 1
10-11
10.4.1 Voltage Regulator
The USB data lines are required by the USB Specification to have a maximum
output voltage between 2.8V and 3.6V. The data lines are also required to have an
external 1.5K
Ω 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
specified 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
Ω external resistor. Figure 10-11 shows the worst case electrical
connection for the voltage regulator.
This regulator can be switched off by user program to save power when the device
is in suspend mode. Please note that if the regulator is off, the D– line should be
tied to another voltage source with an external pull-up resistor.
VROFF — USB 3.3V Voltage Reference
The 3.3V Voltage Regulator for the USB transmitter and external D– pull-up can
be switched off to reduce power consumption when device is in suspend mode.
1 =
Disable 3.3V regulator.
0 =
Enables 3.3V regulator.
Figure 10-11. Regulator Electrical Connections
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
DDRC
R
OCMPO
VROFF
DDRC3
DDRC2
DDRC1
DDRC0
$0006
W
reset:
00000000
LS
Transceiver
3.3V
R2
R2
R1
R1 = 1.5K
Ω ±5%
R2 = 15K
Ω ±5%
Regulator
USB Data Lines
Host
or
Hub
USB Cable
4.4V
VROFF
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com



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