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参数资料
| 型号： | AT83EB5114XXXTGRIL |
| 厂商： | ATMEL CORP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | Low-pin-count 8-bit microcontroller with A/D converter |
| 中文描述： | 8-BIT, MROM, 40 MHz, MICROCONTROLLER, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 62/95页 |
| 文件大小： | 1126K |
| 代理商： | AT83EB5114XXXTGRIL |
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62
4311A–8051–01/05
Accuracy improvement on analog to digital conversion using the internal voltage reference
Overview
The internal Vref absolute accuracy is around 4%. This variation is mainly due to the
temperature, the process, and the voltage variations. In order to increase the accuracy
of the measurements made thanks to the ADC, it is possible to make a software correc-
tion of the Vref, in order to calculate the result the ADC should have returned in case the
Vref was more accurate.
The idea of this improvement is the following: Because there is an EEPROM stacked on
the product, it is possible to store a linear coefficient which allow a correction of the pro-
cess variations.
Coefficient address
The coefficient is stored at the address 0x00 of the serial data EEPROM stacked on the
AT8xEB5114.
Coefficient format
In order to ease the calculation, this coefficient has been stored as a floating decimal
number corresponding to Table 46.
Table 46.
Calibration coefficient storage format
It means that if the value is 0x80, the coefficient is equal to 1. If the coefficient is 0x7e,
the coefficient is equal to 0,111 1110 in binary which is 0,983 in decimal.
During the test, the Vref is measured, and the calibration value calculated is stored at
the address 0x00 of the stack die in accordance with the Table 46 format value.
The relation between the coefficient stored, and the true Vref measurement are
recorded on the Table 47.
Table 47.
Relation between True Vref measurement and coefficient stored into the
EEPROM
Bit
Value
7
1,
6
1/2
5
1/4
4
1/8
3
1/16
2
1/32
1
1/64
0
1/128
True Vref
Value (V)
Min
Typ
Max
2.300 2.316 2.334 2.353 2.372 2.391 2.409 2.428 2.447 2.466 2.484
2.306 2.325 2.345 2.362 2.381 2.400 2.419 2.438 2.456 2.475 2.494
2.316 2.334 2.353 2.372 2.391 2.409 2.428 2.447 2.466 2.484 2.500
0x7b
0x7c
0x7d
0x7e
0x7f
0x80
0.961 0.969 0.977 0.984 0.992
1
Value stored
decimal value
0x81
1.008 1.016 1.023 1.031 1.039
0x82
0x83
0x84
0x85
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AT83EB5114XXXTGRUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Low-pin-count 8-bit microcontroller with A/D converter |
| AT83EC5122 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES |
| AT83EC5123 | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:MICROCONTROLLER WITH USB AND SMART CARD READER INTERFACES |
| AT83EC5136-PLTUL | 功能描述:IC MCU 8BIT 32KB FLASH 48MLF 制造商:microchip technology 系列:- 零件状态:Digi-Key 停止供應 核心处理器:80C52 核心尺寸:8-位 速度:48MHz 连接性:EBI/EMI，I2C，SPI，UART/USART，USB 外设:LED，POR，PWM，WDT I/O 数:34 程序存储容量:32KB（32K x 8） 程序存储器类型:闪存 EEPROM 容量:512 x 8 RAM 容量:1K x 8 电压 - 电源（Vcc/Vdd）:2.7 V ~ 3.6 V 数据转换器:- 振荡器类型:内部 工作温度:-40°C ~ 85°C（TA） 基本零件编号:AT83EC5136 标准包装:260 |
| AT83EC5136XXX-PNTUL | 制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:8-bit Microcontroller with Full Speed USB Device |
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