PIC24FJ256GB206-I/MR Microchip Technology Inc., PIC24FJ256GB206-I/MR Datasheet - Page 235

• Manufacturer Part Number: PIC24FJ256GB206-I/MR
• Description: 16-bit, 256KB Flash, 96K RAM, USB, 64 QFN 9x9x0.9mm TUBE
• Manufacturer: Microchip Technology Inc.

Specifications of PIC24FJ256GB206-I/MR

• A/d Inputs: 16 Channel, 10-bit
• Comparators: 3
• Cpu Speed: 16 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 52
• Interface: I2C/SPI/UART/USART/USB
• Memory Type: Flash
• Number Of Bits: 16
• Package Type: 64-pin QFN
• Programmable Memory: 256K Bytes
• Ram Size: 98K Bytes
• Speed: 32 MHz
• Temperature Range: –40 to 85 °C
• Timers: 5-16-bit
• Voltage, Range: 2.2-3.6 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

 2010 Microchip Technology Inc.
18.1
18.1.1
18.1.1.1
PIC24FJ256GB210 family devices have a built-in
1.5 k resistor on the D+ line that is available when the
microcontroller is 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 bit (U1CON<0>). If the OTGEN bit
(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 mode
• Self-Power Only mode
• 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 OTG Specification”, the total effective capac-
itance appearing across V
more than 10 F.
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.
PIC
Hardware Configuration
®
DEVICE MODE
MCU
D+ Pull-up Resistor
Power Modes
V
USB
D+
D-
EXTERNAL PULL-UP FOR
FULL-SPEED DEVICE
MODE
1.5 k
BUS
and ground must be no
BUS
Controller/HUB
line of the USB
Host
PIC24FJ256GB210 FAMILY
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
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 mode 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 previ-
ously described, and must not enable the USB module
until V
FIGURE 18-3:
FIGURE 18-4:
V
V
~3.3V
~5V
BUS
SELF
V
~5V
100 k
BUS
BUS
BUS
Low I
is driven high.
pin of the USB cable.
Q
Regulator
100
100
3.3V
BUS POWER ONLY
SELF-POWER ONLY
Attach Sense
BUS
Attach Sense
high. One of the 5.5V
DS39975A-page 235
V
V
V
V
USB
BUS
DD
SS
V
V
V
V
BUS
BUS
DD
USB
SS
.