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参数资料
| 型号： | MM908E626AVEK |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | FLASH, 32 MHz, MICROCONTROLLER, PDSO54 |
| 封装： | 5.10 X 10.30 MM, 0.65 MM PITCH, LEAD FREE, SOIC-54 |
| 文件页数： | 25/43页 |
| 文件大小： | 842K |
| 代理商： | MM908E626AVEK |
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Analog Integrated Circuit Device Data
Freescale Semiconductor
31
908E626
FUNCTIONAL DEVICE OPERATION
FACTORY TRIMMING AND CALIBRATION
VOLTAGE REGULATOR
The 908E626 chip contains a low power, low drop voltage
regulator to provide internal power and external power for the
MCU. The VDD regulator accepts a unregulated input supply
and provides a regulated VDD supply to all digital sections of
the device. The output of the regulator is also connected to
the VDD pin to provide the 5.0 V to the microcontroller.
Note: Under loss of power conditions, the discharge of the
VDD capacitor may occur relatively slow. Based on the
selected external components and external VDD load,
additional external load may be required guarantee the MCU
POR threshold being reached before the next power up.
RUN Mode
During RUN mode, the main voltage regulator is on. It
provides a regulated supply to all digital sections.
STOP Mode
During STOP mode the STOP mode regulator supplies a
regulated output voltage. The STOP mode regulator has a
very limited output current capability. The output voltage will
be lower than the output voltage of the main voltage
regulator.
FACTORY TRIMMING AND CALIBRATION
To enhance the ease-of-use of the 908E626, various
parameters (e.g. ICG trim value) are stored in the flash
memory of the device. The following flash memory locations
are reserved for this purpose and might have a value different
from the empty (0xFF) state:
0xFD80:0xFDDF Trim and Calibration Values
0xFFFE:0xFFFF Reset Vector
In the event the application uses these parameters, one
has to take care not to erase or override these values. If these
parameters are not used, these flash locations can be erased
and otherwise used.
Trim Values
Below the usage of the trim values located in the flash
memory is explained
Internal Clock Generator (ICG) Trim Value
The internal clock generator (ICG) module is used to
create a stable clock source for the microcontroller without
using any external components. The untrimmed frequency of
the low frequency base clock (IBASE), will vary as much as
±25%, due to process, temperature, and voltage
dependencies. To compensate this dependencies a ICG trim
values is located at address $FDC2. After trimming the ICG
is a range of typ. ±2% (±3% max.) at nominal conditions
(filtered (100 nF) and stabilized (4.7
F) VDD = 5.0 V,
TAMBIENT~25 °C) and will vary over temperature and voltage
(VDD) as indicated in the 68HC908EY16 datasheet.
To trim the ICG this values has to be copied to the ICG
Trim Register ICGTR at address $38 of the MCU.
Important The value has to be copied after every reset.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MM908E626AVPEK | 功能描述:8位微控制器 -MCU MCU + LIN + MOTOR DRIVER 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 |
| MM908E626AVPEKR2 | 功能描述:8位微控制器 -MCU 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 |
| MM908E626R2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Integrated Stepper Motor Driver with Embedded MCU and LIN Serial Communication |
| MM-90N | 功能描述:ANT MAGN MNT VEHIC 3.5"DIA 10'NF RoHS:是 类别:RF/IF 和 RFID >> RF 天线 系列:* 标准包装:1 系列:* |
| MM90R9F | 制造商:Ohmite Mfg Co 功能描述: |
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