参数资料
型号: PIC16F872-E/SO
厂商: Microchip Technology
文件页数: 104/167页
文件大小: 0K
描述: IC MCU CMOS 20MHZ 2K FLSH 28SOIC
产品培训模块: Asynchronous Stimulus
标准包装: 27
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
连通性: I²C,SPI
外围设备: 欠压检测/复位,POR,PWM,WDT
输入/输出数: 22
程序存储器容量: 3.5KB(2K x 14)
程序存储器类型: 闪存
EEPROM 大小: 64 x 8
RAM 容量: 128 x 8
电压 - 电源 (Vcc/Vdd): 4 V ~ 5.5 V
数据转换器: A/D 5x10b
振荡器型: 外部
工作温度: -40°C ~ 125°C
封装/外壳: 28-SOIC(0.295",7.50mm 宽)
包装: 管件
41
8048C–AVR–02/12
ATtiny43U
Figure 8-7.
Typical Output Voltage of Boost Converter at Full and Variable Duty Cycle.
See section “Software Control of Boost Converter” on page 41 for instructions on how to turn on
and off duty cycle control.
The use of Full Duty Cycle mode is recommended only at low load currents.
8.4
Overload Behaviour
The output is considered overloaded when the load current, I
LOAD, exceeds the maximum given
in Table 20-7 on page 162. During an overload condition the boost converter operates at maxi-
mum duty cycle and can no longer regulate V
CC. If the overload condition prevails the output
voltage will drop as load current increases. If V
CC drops below its minimum level the converter
will switch to Start Mode.
In Start Mode the converter has a low load current capability, which means nearly all overload
current will be drained straight from the battery (or other power source) via the inductor and the
diode. The resistance of the inductor is typically very low and, provided the voltage of the power
source remains constant, the output voltage during overload will stabilise to battery voltage,
V
BAT, minus the forward voltage drop, VF, of the diode used.
8.5
Software Control of Boost Converter
The boost converter is an independent hardware module that requires no interaction by the
microcontroller, although some features can be controlled by firmware. Features that can be
controlled by firmware are described in the following sections.
8.5.1
Stopping the Boost Converter
The device firmware can stop the boost converter on demand. When issued a stop signal, the
boost converter will exit Active Mode and enter Stop Mode, as illustrated in Figure 8-3 on page
36. This procedure allows the device to read true battery voltage using the on-board ADC,
assess if the voltage is sufficient for the selected battery chemistry and then control the boost
converter accordingly.
Stopping the boost converter automatically sends a request to the device reset handler. This sig-
nal will eventually set the device in reset but only after the output voltage V
CC has dropped to a
level approximately two times the battery voltage. This means that for very low battery voltages
a device reset can not be guaranteed before supply voltage has dropped below minimum oper-
ating level. In order to ensure device operating limits are not violated it is therefore strongly
recommended to have the Brown-Out Detector enabled.
VCC
FDC = ON
FDC = OFF
FULL
DU
TY
C
YCL
E
VAR
IAB
LE
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PIC16F872-I/SO 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F872-I/SO 制造商:Microchip Technology Inc 功能描述:8BIT FLASH MCU SMD 16F872 SOIC28
PIC16F872-I/SOG 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O Lead Free Package RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F872-I/SP 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 22 I/O RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
PIC16F872-I/SP 制造商:Microchip Technology Inc 功能描述:IC 8BIT FLASH MCU 16F872 SDIL28