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| 型号： | DM183032 |
| 厂商： | Microchip Technology |
| 文件页数： | 19/38页 |
| 文件大小： | 0K |
| 描述： | BOARD EXPLORER PICDEM PIC18 |
| 产品培训模块： | 8-bit PIC® Microcontroller Portfolio |
| 标准包装： | 1 |
| 系列： | MPLAB® |
| 类型： | MCU |
| 适用于相关产品： | PIC18 系列 |
| 所含物品： | 评估板 |
| 产品目录页面： | 659 (CN2011-ZH PDF) |
| 相关产品： | MA180030-ND - BOARD DEMO PIC18F47J13 FS USB MA180029-ND - BOARD DEMO PIC18F47J53 FS USB MA180028-ND - MOD PLUG-IN PIC18F87K22 PIM MA180026-ND - MODULE PLUG-IN PIC18F45K20 MA180023-ND - MODULE PLUG-IN PIC18F46J11 PIM MA180024-ND - MODULE PLUG-IN 18F46J50 FS USB MA180018-ND - MODULE PLUG-IN 18F85J11 MA180020-ND - MODULE PLUG-IN HPC EXPL 18F87J11 MA180021-ND - MODULE PLUG-IN 18F87J50 FS USB MA180016-ND - MODULE PLUG-IN PICDEM HPC BLANK 更多... |
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Getting Started
2.3.3
Calculating Other V DD Values
Other V DD values can be produced by the LM317 adjustable voltage regulator by
populating the PIM board’s R101 and R102 with different value resistors.
A brief overview follows, on how to calculate alternate values for these resistors. For
detailed information, see the LM317 data sheet.
EQUATION 2-1:
REGULATOR VOLTAGE OUTPUT
V OUT = V REF ? 1 + ------- ? + I ADJ ? R2
R2
? R1 ?
I ADJ is minimized by the LM317, so it can be assumed to be zero, or very small. V REF
is the reference voltage developed by the LM317 between the output and adjustment
terminal and equals 1.25V.
EQUATION 2-2:
CALCULATING OUTPUT VOLTAGE
V OUT = 1.25V 1 + ------- ?
R2 = R25 || R102 = ----------------------------------
R1 = R26 || R101 = ----------------------------------
? R2
? R1 ?
( R25 ? R102 )
( R25 + R102 )
( R26 ? R101 )
( R26 + R101 )
As stated previously, R25 = 1 k Ω , and R26 = 330 Ω . Without R102 and R101 being
inserted in parallel on the PIM board, V OUT =1.25V(1+ 1 k Ω /330 Ω ) = 5.04V.
To calculate a desired V OUT :
1. Solve for R2, given R1 = R26 = 330 Ω .
2. Now knowing R2 and R25, solve for R102.
3. Determine the nearest available resistor value for R102 and recalculate the
resulting V DD to make sure it does not exceed the maximum V DD for the part you
will be using.
table assumes that the PICDEM PIC18 Explorer Demonstration Board’s R25 and R26
resistors are left at their default values of 1K Ω and 330 Ω , respectively.
TABLE 2-2:
CALCULATING R101, R102 VALUES FOR V DD OUTPUTS ?
V DD
5V
3.6V
3.3V
3.0V
R101 Value
Open
Open
Open
Open
R102 Value
Open
1.62 k Ω
1.18 k Ω
866 R Ω
? This table assumes that the PICDEM PIC18 Explorer Demonstration Board ’s
R25 and R26 resistors are left at their default values of 1 k Ω and 330 Ω ,
respectively.
? 2008 Microchip Technology Inc.
DS51721B-page 15
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