参数资料
型号: AT89EB5114-TGSIL
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, FLASH, 40 MHz, MICROCONTROLLER, PDSO20
封装: SO-20
文件页数: 62/95页
文件大小: 1126K
代理商: AT89EB5114-TGSIL
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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