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PIC18F84J11-I/PT 用户编程技术手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
微控制器
封装:
TQFP-80
描述:
pic18 16KB 闪存 1024字节-RAM 67I/O 8 位 系列,nanoWatt 80TQFP
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PIC18F84J11-I/PT数据手册
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PIC18F6XJXX/8XJXX
DS39644L-page 6 2009 Microchip Technology Inc.
2.1.1 ON-CHIP VOLTAGE REGULATOR
All of the PIC18F6XJXX/8XJXX devices have dual
power requirements. The microcontroller core can be
powered from an external source that is separate from
V
DD, or it can be powered from an on-chip regulator
which derives power from VDD. Both sources use the
common V
DDCORE/VCAP pin.
The regulator is enabled by connecting VDD to the
ENVREG pin. In this case, a low ESR capacitor must
be connected to the V
DDCORE/VCAP pin for proper
device operation. If the regulator is disabled by con-
necting V
SS to the ENVREG pin, power to the core
must be supplied on VDDCORE/VCAP. Whether or not
the regulator is used, it is always good design practice
to have sufficient capacitance on all supply pins.
Examples are shown in Figure 2-4.
The specifications for core voltage and capacitance are
listed in Section 6.0 “AC/DC Characteristics and
Timing Requirements for Program/Verify Test
Mode”.
FIGURE 2-4: CONNECTIONS FOR THE
ON-CHIP REGULATOR
VDD
ENVREG
V
DDCORE/VCAP
VSS
PIC18F6XJXX/8XJXX
3.3V
(1)
2.5V
(1)
VDD
ENVREG
V
DDCORE/VCAP
VSS
PIC18F6XJXX/8XJXX
CF
3.3V
(1)
Regulator Enabled (ENVREG tied to VDD):
Regulator Disabled (ENVREG tied to Ground):
Note 1: These are typical operating voltages. Refer to
Section 6.0 “AC/DC Characteristics and
Timing Requirements for Program/Verify
Test Mode”.
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