PIC24FJ64GB002-I/SS Microchip Technology, PIC24FJ64GB002-I/SS Datasheet - Page 199

• Manufacturer Part Number: PIC24FJ64GB002-I/SS
• Description: 16-bit, 16 MIPS, 64KB Flash, 8KB RAM, Nanowatt XLP, USB OTG 28 SSOP .209in TUBE
• Manufacturer: Microchip Technology

Specifications of PIC24FJ64GB002-I/SS

• Processor Series: PIC24
• Core: PIC24F
• Data Bus Width: 16 bit
• Program Memory Type: Flash
• Program Memory Size: 64 KB
• Data Ram Size: 8192 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 32 MHz
• Number Of Programmable I/os: 21
• Number Of Timers: 5
• Operating Supply Voltage: 2 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Development Tools By Supplier: MPLAB Integrated Development Environment
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current (max): 300 mA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

18.1
18.1.1
18.1.1.1
PIC24FJ64GB004 family devices have a built-in 1.5 k
resistor on the D+ line that is available when the micro-
controller in operating in device mode. This is used to
signal an external Host that the device is operating in
Full-Speed Device mode. It is engaged by setting the
USBEN
(U1OTGCON<2>) is set, then the D+ pull-up is enabled
through the DPPULUP bit (U1OTGCON<7>).
Alternatively, an external resistor may be used on D+,
as shown in Figure 18-2.
FIGURE 18-2:
18.1.1.2
Many USB applications will likely have several different
sets of power requirements and configuration. The
most common power modes encountered are:
• Bus Power Only
• Self-Power Only
• Dual Power with Self-Power Dominance
Bus Power Only mode (Figure 18-3) is effectively the
simplest method. All power for the application is drawn
from the USB.
To meet the inrush current requirements of the USB 2.0
Specification, the total effective capacitance appearing
across V
In the USB Suspend mode, devices must consume no
more than 2.5 mA from the 5V V
cable. During the USB Suspend mode, the D+ or D-
pull-up resistor must remain active, which will consume
some of the allowed suspend current.
In Self-Power Only mode (Figure 18-4), the USB
application provides its own power, with very little
power being pulled from the USB. Note that an attach
indication is added to indicate when the USB has been
connected and the host is actively powering V
 2010 Microchip Technology Inc.
PIC
BUS
Hardware Configuration
bit
®
DEVICE MODE
MCU
and ground must be no more than 10 F.
D+ Pull-up Resistor
Power Modes
V
USB
(U1CON<0>).
D+
D-
EXTERNAL PULL-UP FOR
FULL-SPEED DEVICE
MODE
1.5 k
If
BUS
Controller/HUB
the
line of the USB
Host
OTGEN
BUS
.
PIC24FJ64GB004 FAMILY
bit
To meet compliance specifications, the USB module
(and the D+ or D- pull-up resistor) should not be enabled
until the host actively drives V
tolerant I/O pins may be used for this purpose.
The application should never source any current onto
the 5V V
The Dual Power option with Self-Power Dominance
(Figure 18-5) allows the application to use internal
power primarily, but switch to power from the USB
when no internal power is available. Dual Power
devices must also meet all of the special requirements
for inrush current and Suspend mode current
previously described, and must not enable the USB
module until V
FIGURE 18-3:
FIGURE 18-4:
FIGURE 18-5:
V
V
~3.3V
V
V
~5V
~3.3V
BUS
~5V
SELF
BUS
SELF
V
~5V
BUS
100 k
BUS
Regulator
Low I
Low I
100 k
pin of the USB cable.
BUS
Q
Q
0-100 k
Regulator
3.3V
0-100 k
is driven high.
0-100 k
3.3V
BUS POWER ONLY
SELF-POWER ONLY
DUAL POWER EXAMPLE
Attach Sense
BUS
Attach Sense
Attach Sense
high. One of the 5.5V
DS39940D-page 199
V
V
V
V
BUS
DD
USB
SS
V
V
V
V
V
V
V
V
BUS
DD
USB
SS
BUS
DD
USB
SS