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參數(shù)資料
| 型號(hào)： | ATMEGA328P-15MZ |
| 廠商： | Atmel |
| 文件頁數(shù)： | 59/83頁 |
| 文件大小： | 0K |
| 描述： | MCU AVR 32K FLASH 15MHZ 32-QFN |
| 產(chǎn)品培訓(xùn)模塊： | megaAVR Introduction |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | AVR® ATmega |
| 核心處理器： | AVR |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | I²C，SPI，UART/USART |
| 外圍設(shè)備： | 欠壓檢測/復(fù)位，POR，PWM，WDT |
| 輸入/輸出數(shù)： | 23 |
| 程序存儲(chǔ)器容量： | 32KB（16K x 16） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大?。?/td> | 1K x 8 |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 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 ~ 125°C |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 包裝： | 剪切帶 (CT) |
| 其它名稱： | ATMEGA328P-15MZCT |
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PIC12(L)F1822/PIC16(L)F1823
DS41413C-page 220
2010-2012 Microchip Technology Inc.
24.4.2.1
Direction Change in Full-Bridge
Mode
In the Full-Bridge mode, the P1M1 bit in the CCP1CON
register allows users to control the forward/reverse
direction. When the application firmware changes this
direction control bit, the module will change to the new
direction on the next PWM cycle.
A direction change is initiated in software by changing
the P1M1 bit of the CCP1CON register. The following
sequence occurs four Timer cycles prior to the end of
the current PWM period:
The modulated outputs (P1B and P1D) are placed
in their inactive state.
The associated unmodulated outputs (P1A and
P1C) are switched to drive in the opposite
direction.
PWM modulation resumes at the beginning of the
next period.
See Figure 24-12 for an illustration of this sequence.
The Full-Bridge mode does not provide dead-band
delay. As one output is modulated at a time, dead-band
delay is generally not required. There is a situation
where dead-band delay is required. This situation
occurs when both of the following conditions are true:
1.
The direction of the PWM output changes when
the duty cycle of the output is at or near 100%.
2.
The turn-off time of the power switch, including
the power device and driver circuit, is greater
than the turn-on time.
Figure 24-13 shows an example of the PWM direction
changing from forward to reverse, at a near 100% duty
cycle. In this example, at time t1, the output P1A and
P1D become inactive, while output P1C becomes
active. Since the turn off time of the power devices is
longer than the turn on time, a shoot-through current
will flow through power devices QC and QD (see
Figure 24-10) for the duration of ‘t’. The same
phenomenon will occur to power devices QA and QB
for PWM direction change from reverse to forward.
If changing PWM direction at high duty cycle is required
for an application, two possible solutions for eliminating
the shoot-through current are:
1.
Reduce PWM duty cycle for one PWM period
before changing directions.
2.
Use switch drivers that can drive the switches off
faster than they can drive them on.
Other options to prevent shoot-through current may
exist.
FIGURE 24-12:
EXAMPLE OF PWM DIRECTION CHANGE
Pulse Width
Period(1)
Signal
Note 1:
The direction bit P1M1 of the CCP1CON register is written any time during the PWM cycle.
2:
When changing directions, the P1A and P1C signals switch before the end of the current PWM cycle. The
modulated P1B and P1D signals are inactive at this time. The length of this time is four Timer counts.
Period
(2)
P1A (Active-High)
P1B (Active-High)
P1C (Active-High)
P1D (Active-High)
Pulse Width
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| ATMEGA328P-20AU | 制造商:Atmel Corporation 功能描述:MCU 8-bit ATmega AVR RISC 32KB Flash 3.3V/5V 32-Pin TQFP |
| ATMEGA328P20MU | 制造商:Atmel Corporation 功能描述:MCU 8-Bit ATmega AVR RISC 32KB Flash 3.3V/5V 32-Pin MLF |
| ATMEGA328P-AN | 功能描述:8位微控制器 -MCU AVR 32K FLSH 2K SRAM 1KB EE-20 MHZ 105C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ATMEGA328P-ANR | 功能描述:8位微控制器 -MCU AVR 32K FLSH 2K SRAM 1KB EE-20 MHZ 105C RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| ATMEGA328P-AU | 功能描述:8位微控制器 -MCU 32KB In-system Flash 20MHz 1.8V-5.5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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