參數(shù)資料
型號(hào): DSPIC33FJ16GS404-50I/PT
廠商: Microchip Technology
文件頁(yè)數(shù): 97/182頁(yè)
文件大小: 0K
描述: IC MCU/DSP 16KB FLASH 44-TQFP
標(biāo)準(zhǔn)包裝: 160
系列: dsPIC™ 33F
核心處理器: dsPIC
芯體尺寸: 16-位
速度: 50 MIPs
連通性: I²C,IrDA,LIN,SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,PWM,WDT
輸入/輸出數(shù): 35
程序存儲(chǔ)器容量: 16KB(16K x 8)
程序存儲(chǔ)器類(lèi)型: 閃存
RAM 容量: 2K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-TQFP
包裝: 托盤(pán)
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2008-2012 Microchip Technology Inc.
DS70318F-page 21
dsPIC33FJ06GS101/X02 and dsPIC33FJ16GSX02/X04
2.5
ICSP Pins
The PGECx and PGEDx pins are used for In-Circuit
Serial
Programming
(ICSP)
and
debugging
purposes. It is recommended to keep the trace length
between the ICSP connector and the ICSP pins on the
device as short as possible. If the ICSP connector is
expected to experience an ESD event, a series resistor
is recommended, with the value in the range of a few
tens of Ohms, not to exceed 100 Ohms.
Pull-up resistors, series diodes, and capacitors on the
PGECx and PGEDx pins are not recommended as they
will
interfere
with
the
programmer/debugger
communications to the device. If such discrete
components are an application requirement, they
should be removed from the circuit during program-
ming and debugging. Alternatively, refer to the AC/DC
characteristics and timing requirements information in
the respective device Flash programming specification
for information on capacitive loading limits and pin input
voltage high (VIH) and input low (VIL) requirements.
Ensure that the “Communication Channel Select”
(i.e., PGECx/PGEDx pins) programmed into the device
matches the physical connections for the ICSP to
MPLAB ICD 3 or MPLAB REAL ICE.
For more information on ICD 3 and REAL ICE
connection
requirements,
refer
to
the
following
documents that are available on the Microchip website.
“Using MPLAB ICD 3” (poster) DS51765
“MPLAB ICD 3 Design Advisory” DS51764
“MPLAB REAL ICE In-Circuit Debugger
User's Guide” DS51616
“Using MPLAB REAL ICE” (poster) DS51749
2.6
External Oscillator Pins
Many DSCs have options for at least two oscillators: a
high-frequency primary oscillator and a low-frequency
secondary oscillator (refer to Section 8.0 “Oscillator
Configuration” for details).
The oscillator circuit should be placed on the same
side of the board as the device. Also, place the
oscillator circuit close to the respective oscillator pins,
not
exceeding
one-half
inch
(12 mm)
distance
between them. 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 circuit to isolate them 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. A
suggested layout is shown in Figure 2-3.
FIGURE 2-3:
SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
2.7
Oscillator Value Conditions on
Device Start-up
If the PLL of the target device is enabled and
configured for the device start-up oscillator, the
maximum oscillator source frequency must be limited
to 4 MHz < FIN < 8 MHz to comply with device PLL
start-up conditions. This means that if the external
oscillator
frequency
is
outside
this
range,
the
application must start up in the FRC mode first. The
default PLL settings after a POR with an oscillator
frequency outside this range will violate the device
operating speed.
Once the device powers up, the application firmware
can initialize the PLL SFRs, CLKDIV, and PLLDBF to a
suitable value, and then perform a clock switch to the
Oscillator + PLL clock source. Note that clock switching
must be enabled in the device Configuration word.
13
Main Oscillator
Guard Ring
Guard Trace
Secondary
Oscillator
14
15
16
17
18
19
20
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