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PIC16LF1947-E/MR 参数 Datasheet PDF下载

PIC16LF1947-E/MR图片预览
型号: PIC16LF1947-E/MR
PDF下载: 下载PDF文件 查看货源
内容描述: [64-Pin Flash-Based, 8-Bit CMOS Microcontrollers with LCD Driver and nanoWatt XLP Technology]
分类和应用: 微控制器
文件页数/大小: 440 页 / 4740 K
品牌: MICROCHIP [ MICROCHIP ]
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PIC16F/LF1946/47  
Since the PxA and PxB outputs are multiplexed with the  
PORT data latches, the associated TRIS bits must be  
cleared to configure PxA and PxB as outputs.  
22.4.1  
HALF-BRIDGE MODE  
In Half-Bridge mode, two pins are used as outputs to  
drive push-pull loads. The PWM output signal is output  
on the CCPx/PxA pin, while the complementary PWM  
output signal is output on the PxB pin (see  
Figure 22-9). This mode can be used for Half-Bridge  
applications, as shown in Figure 22-9, or for Full-Bridge  
applications, where four power switches are being  
modulated with two PWM signals.  
FIGURE 22-8:  
EXAMPLE OF  
HALF-BRIDGE PWM  
OUTPUT  
Period  
Period  
Pulse Width  
In Half-Bridge mode, the programmable dead-band delay  
can be used to prevent shoot-through current in  
Half-Bridge power devices. The value of the PDC<6:0>  
bits of the PWMxCON register sets the number of  
instruction cycles before the output is driven active. If the  
value is greater than the duty cycle, the corresponding  
output remains inactive during the entire cycle. See  
Section 22.4.5 “Programmable Dead-Band Delay  
Mode” for more details of the dead-band delay  
operations.  
(2)  
(2)  
PxA  
td  
td  
PxB  
(1)  
(1)  
(1)  
td = Dead-Band Delay  
Note 1: At this time, the TMRx register is equal to the  
PRx register.  
2: Output signals are shown as active-high.  
FIGURE 22-9:  
EXAMPLE OF HALF-BRIDGE APPLICATIONS  
Standard Half-Bridge Circuit (“Push-Pull”)  
FET  
Driver  
+
-
PxA  
Load  
FET  
Driver  
+
-
PxB  
Half-Bridge Output Driving a Full-Bridge Circuit  
V+  
FET  
Driver  
FET  
Driver  
PxA  
Load  
FET  
FET  
Driver  
Driver  
PxB  
2010 Microchip Technology Inc.  
Preliminary  
DS41414A-page 219  
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