PIC24FJ32GB002-E/ML MICROCHIP [Microchip Technology], PIC24FJ32GB002-E/ML Datasheet - Page 200

• Manufacturer Part Number: PIC24FJ32GB002-E/ML
• Description: 28/44-Pin, 16-Bit, Flash Microcontrollers with USB On-The-Go (OTG) and nanoWatt XLP Technology
• Manufacturer: MICROCHIP [Microchip Technology]

PIC24FJ64GB004 FAMILY
18.1.2
18.1.2.1
PIC24FJ64GB004 family devices have built-in 15 k
pull-down resistor on the D+ and D- lines. These are
used in tandem to signal to the bus that the microcon-
troller is operating in Host mode. They are engaged by
setting the HOSTEN bit (U1CON<3>). If the OTGEN bit
(U1OTGCON<2>) is set, then these pull-downs are
enabled by setting the DPPULDWN and DMPULDWN
bits (U1OTGCON<5:4>).
18.1.2.2
In Host mode, as well as Host mode in On-the-Go
operation, the USB 2.0 specification requires that the
Host application supply power on V
FIGURE 18-6:
FIGURE 18-7:
DS39940D-page 200
HOST AND OTG MODES
D+ and D- Pull-down Resistors
Power Configurations
Connector
Micro A/B
Connector
Micro A/B
V
GND
BUS
D+
HOST INTERFACE EXAMPLE
OTG INTERFACE EXAMPLE
D-
V
ID
GND
BUS
D+
D-
ID
4.7 µF
150 µF
BUS
1 µF
40 k
. Since the
Thermal Fuse
Polymer PTC
2 k
2 k
GND
C+
C-
V
OUT
MCP1253
SELECT
PGOOD
SHND
+5V
0.1 µF,
3.3V
V
IN
microcontroller is running below V
source sufficient current, a separate power supply must
be provided.
When the application is always operating in Host mode,
a simple circuit can be used to supply V
late current on the bus (Figure 18-6). For OTG opera-
tion, it is necessary to be able to turn V
needed, as the microcontroller switches between
Device and Host modes. A typical example using an
external charge pump is shown in Figure 18-7.
+3.3V +3.3V
V
DD
10 µF
V
V
A/D pin
V
D+
D-
ID
V
USB
PIC
DD
BUS
SS
I/O
I/O
V
D+
D-
ID
V
PIC
BUS
SS
®
Microcontroller
®
Microcontroller
 2010 Microchip Technology Inc.
BUS
and is not able to
BUS
BUS
on or off as
and regu-