參數(shù)資料
型號(hào)： W78E378
廠商： WINBOND ELECTRONICS CORP
元件分類： 微控制器/微處理器
英文描述： MONITOR MICROCONTROLLER
中文描述： 8-BIT, FLASH, 10 MHz, MICROCONTROLLER, PDIP32
封裝： 0.600 INCH, PLASTIC, DIP-32
文件頁(yè)數(shù)： 35/38頁(yè)
文件大小： 396K
代理商： W78E378
Preliminary W78E378/W78C378/W78C374
Publication Release Date: December 1999
- 35 - Revision A1
Appendix A. Application Note for Usage of ADC
To use the ADC, users should pay attention to the following points:
(1) According to the absolute maximum ratings, the input voltage should not exceed V
DD
+0.3V,
especially for the ADC channel pins (P2.4
P2.7 & P3.5
P3.7). If a voltage over V
DD
+0.3V exists
on any of these ADC channel pins, the AD conversion will fail.
(2) Owing to the CMOS process, the ADC curve of some chip might differ from those of the others.
So, before using the ADC, the S/W should do the ADC calibration described below.
Step 1. Set (ADCS2, ADCS1, ADCS0, ADCcal) = (1, 1, 1, 0) and then do AD coversion to get
the ADC value for the on-chip
0.948V
input. Suppose it is
A
.
Step 2. Set (ADCS2, ADCS1, ADCS0, ADCcal) = (1, 1, 1, 1) and then do AD coversion to get
the ADC value for the on-chip
2.924V
input. Suppose it is
B
.
Step 3. Because the ADC curve in the usable range is linear, any
V
and
X
should
meet the
formula:
(X-A)/(V-0.948) = (B-A)/(2.924-0.948)
,
where
V
is the key voltage (designed by users and thus known) and
X
is its predicted
ADC value. Then, we can get
X = A + (V-0.948)(B-A)/(2.924-0.948)
, regardless of V >
0.948V or < 0.948V. (
Of course, some effort should be paid in S/W to find
X
.)
Step 4. Suppose there are N keys used, the N predicted ADC values for these keys can be
found.
1.0
2.0
3.0
4.0
5.0
ADC input voltage
ADC value
X
A
B
V
Usable range
(is linear)
After finding these N predicted ADC values, the S/W can recognize which key is pressed by
comparing the ADC value of this key with the set of predicted values (found previously).
** Note: To get the exact on-chip calibration voltages (0.948V and 2.924V), the V
DD
should be 5.0V as close as possible.
相關(guān)PDF資料
PDF描述
W78E378P MONITOR MICROCONTROLLER
W78C438B 8-BIT Microcontroller(8位的微控制器)
W78C438C40FL 8-BIT MICROCONTROLLER
W78C438C40PL 8-BIT MICROCONTROLLER
W78C458 8-BIT EMULATION MICROCONTROLLER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
W78E378A10PL 功能描述:IC MCU 8-BIT 32K FLASH 44-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W78 標(biāo)準(zhǔn)包裝:300 系列:78K0R/Ix3 核心處理器:78K/0R 芯體尺寸:16-位 速度:40MHz 連通性:3 線 SIO，I²C，LIN，UART/USART 外圍設(shè)備:DMA，LVD，POR，PWM，WDT 輸入/輸出數(shù):27 程序存儲(chǔ)器容量:16KB（16K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:38-SSOP 包裝:托盤(pán)
W78E378P 制造商:WINBOND 制造商全稱:Winbond 功能描述:MONITOR MICROCONTROLLER
W78E51-16 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
W78E51-24 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
W78E51-33 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*