參數(shù)資料
型號： PIC10F202-I/P
廠商： Microchip Technology
文件頁數(shù)： 58/94頁
文件大?。?/td> 0K
描述： IC PIC MCU FLASH 512X12 8DIP
產(chǎn)品培訓(xùn)模塊： Asynchronous Stimulus
8-bit PIC® Microcontroller Portfolio
標(biāo)準(zhǔn)包裝： 60
系列： PIC® 10F
核心處理器： PIC
芯體尺寸： 8-位
速度： 4MHz
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 3
程序存儲器容量： 768B（512 x 12）
程序存儲器類型： 閃存
RAM 容量： 24 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-DIP（0.300"，7.62mm）
包裝： 管件
產(chǎn)品目錄頁面： 637 (CN2011-ZH PDF)
配用： AC162059-ND - HEADER INTRFC MPLAB ICD2 8/14PIN
62
AT89/83EB5114
4311C–8051–02/08
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
2.300 2.316 2.334 2.353 2.372 2.391 2.409 2.428 2.447 2.466 2.484
Typ
2.306 2.325 2.345 2.362 2.381 2.400 2.419 2.438 2.456 2.475 2.494
Max 2.316 2.334 2.353 2.372 2.391 2.409 2.428 2.447 2.466 2.484 2.500
Value stored
0x7b 0x7c 0x7d 0x7e 0x7f 0x80 0x81 0x82 0x83 0x84 0x85
decimal value
0.961 0.969 0.977 0.984 0.992
1
1.008 1.016 1.023 1.031 1.039
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