PIC24FJ256DA210-I/PT Microchip Technology Inc., PIC24FJ256DA210-I/PT Datasheet - Page 36

• Manufacturer Part Number: PIC24FJ256DA210-I/PT
• Description: 100 TQFP 12x12x1mm TRAY, 16-bit, 256KB Flash, 96K RAM, USB, Graphics
• Manufacturer: Microchip Technology Inc.

Specifications of PIC24FJ256DA210-I/PT

• A/d Inputs: 24 Channel, 10-Bit
• Comparators: 3
• Cpu Speed: 16 MIPS
• Eeprom Memory: 0 Bytes
• Input Output: 84
• Interface: I2C/SPI/UART
• Memory Capacity: 256 Kbytes
• Memory Type: Flash
• Number Of Bits: 16
• Number Of Leads: 100
• Number Of Pins: 100
• Package Type: 100-Pin TQFP
• Programmable Memory: 256K Bytes
• Ram Size: 96K Bytes
• Speed: 32 MHz
• Temperature Range: –40 to +85 °C
• Timers: 5-16-bit
• Voltage, Range: 2.2-3.6 V
• Voltage, Rating: 2.2-3.6 V
• Run Mode: 800 μA/MIPS, 3.3 V Typical
• Standby Current With 32 Khz Oscillator: 22 μA, 3.3 V Typical
• Lead Free Status / Rohs Status: RoHS Compliant part

PIC24FJ256DA210 FAMILY
2.6
Many microcontrollers have options for at least two
oscillators: a high-frequency primary oscillator and a
low-frequency
Section 8.0 “Oscillator Configuration” for details).
The oscillator circuit should be placed on the same
side of the board as the device. Place the oscillator
circuit close to the respective oscillator pins with no
more than 0.5 inch (12 mm) between the circuit
components and the pins. The load capacitors should
be placed next to the oscillator itself, on the same side
of the board.
Use a grounded copper pour around the oscillator cir-
cuit to isolate it from surrounding circuits. The
grounded copper pour should be routed directly to the
MCU ground. Do not run any signal traces or power
traces inside the ground pour. Also, if using a two-sided
board, avoid any traces on the other side of the board
where the crystal is placed.
Layout suggestions are shown in Figure 2-4. In-line
packages may be handled with a single-sided layout
that completely encompasses the oscillator pins. With
fine-pitch packages, it is not always possible to com-
pletely surround the pins and components. A suitable
solution is to tie the broken guard sections to a mirrored
ground layer. In all cases, the guard trace(s) must be
returned to ground.
In planning the application’s routing and I/O assign-
ments, ensure that adjacent port pins and other signals
in close proximity to the oscillator are benign (i.e., free
of high frequencies, short rise and fall times and other
similar noise).
For additional information and design guidance on
oscillator circuits, please refer to these Microchip
Application Notes, available at the corporate web site
(www.microchip.com):
• AN826, “Crystal Oscillator Basics and Crystal
• AN849, “Basic PICmicro
• AN943, “Practical PICmicro
• AN949, “Making Your Oscillator Work”
DS39969B-page 36
Selection for rfPIC™ and PICmicro
and Design”
External Oscillator Pins
secondary
®
Oscillator Design”
®
oscillator
Oscillator Analysis
®
Devices”
(refer
to
FIGURE 2-4:
(tied to ground)
Bottom Layer
Copper Pour
Oscillator
Secondary
Primary
Oscillator
Crystal
GND
OSCO
OSCI
C1
C2
Sec Oscillator: C1
DEVICE PINS
(tied to ground)
Single-Sided and In-line Layouts:
Copper Pour
Fine-Pitch (Dual-Sided) Layouts:
`
`
SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
Top Layer Copper Pour
(tied to ground)
 2010 Microchip Technology Inc.
`
Primary Oscillator
Sec Oscillator: C2
Crystal
DEVICE PINS
C2
C1
Oscillator
OSCI
OSCO
GND
SOSCO
SOSC I
Crystal