PIC24FJ128GB MICROCHIP [Microchip Technology], PIC24FJ128GB Datasheet - Page 202

• Manufacturer Part Number: PIC24FJ128GB
• Description: 64/80/100-Pin, 16-Bit Flash Microcontrollers with USB On-The-Go (OTG)
• Manufacturer: MICROCHIP [Microchip Technology]

PIC24FJ256GB110 FAMILY
17.2
When operating as a USB host, either as an A-device
in an OTG configuration or as an embedded host, V
must
PIC24FJ256GB110 family devices have an internal
V
V
Figure 17-3 shows how the internal V
of the USB OTG module work in A-device and B-device
configurations.
To enable voltage generation:
1.
2.
FIGURE 17-3:
DS39897B-page 200
USB
GND
BUS
BUS
SIE
Note 1: Additional external components (not shown here) and software configuration are required for a host device to generate
ID
Verify that the USB module is powered
(U1PWRC<0> = 1) and that the V
is disabled (U1OTGCON<0> = 0).
Set the PWM period (U1PWMRRS<7:0>) and
duty cycle (U1PWMRRS<15:8>) as required.
boost assist to help generate the required 5V
from the available voltages on the board.
be
V
BUS
V
COMPARATORS
supplied
A-DEVICE (HOST)
PIC24FJ256GB1XX
BUS
REGULATOR
5V BOOST
ASSIST
Voltage Generation
. For more information, refer to the “PIC24F Family Reference Manual”.
XCVR
V
3.3V
BUS
(1)
USB VOLTAGE GENERATION AND CONNECTIONS BETWEEN AN A-DEVICE
AND A B-DEVICE
to
the
D+
D-
attached
BUS
BUS
components
discharge
device.
BUS
Preliminary
V
BUS
GND
D-
ID
D+
(5V)
3.
4.
5.
6.
7.
Note:
Select the required polarity of the output signal
based on the configuration of the external circuit
with the PWMPOL bit (U1PWMCON<9>).
Select the desired target voltage using the
VBUSCHG bit (U1OTGCON<1>).
Enable the PWM counter by setting the CNTEN
bit to ‘1’ (U1PWMCON<8>).
Enable the PWM module by setting the PWMEN
bit to ‘1’ (U1PWMCON<15>).
Enable
(U1OTGCON<3> = 1).
This
process for V
control. Please refer to the “PIC24F
Family Reference Manual” for additional
examples.
the
D+
D-
section
PIC24FJ256GB1XX
V
© 2008 Microchip Technology Inc.
BUS
BUS
COMPARATORS
B-DEVICE
REGULATOR
describes
5V BOOST
voltage generation and
ASSIST
XCVR
V
generation
3.3V
BUS
the
general
circuit
GND
ID
USB
SIE