參數(shù)資料
型號: AT89EB5114-TGSIL
廠商: Atmel
文件頁數(shù): 55/86頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 4K 20SOIC
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 38
系列: 89EB
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 11
程序存儲器容量: 4KB(4K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 256 x 8
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 6x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 616 (CN2011-ZH PDF)
59
AT89/83EB5114
4311C–8051–02/08
Channel 3 Amplifier and
Rectifying Function
If needed, the average value of the rectified signal on channel 3 can be extracted and
amplified before A/D conversion as shown on Figure 28.
Figure 28. Channel 3 Amplifier
The main characteristics of this block are the following:
Input signal level: sine wave centered around Vssa, peak value from 70 to 550 mV
depending on gain, Frequency range from 35 to 70KHz. Be sure that the peak value
on the amplifier output is lower than voltage supply.
Gain: x5, x10, x15 and x20, selected using AC3E, AC3G1 and AC3G0 in ADC
Amplifier register (See Table 44 and Table 52)
Max time constant of the average value extraction: 0.5ms. When the gain is
changed or when the signal levels changes from the minimum to the maximum
value, a new measurement can be done after 10 time constant.
The amplifier needs 20us to fully load the ADC hold capacitance so the ADC
conversion must occurs at least 20us after the amplified channel is sampled.
Accuracy on amplification and extraction: +/- 5%
Note:
The AIN3 direct channel is not equivalent to the other channels. There is a serial resis-
tance of around 100K between the pin and the ADC input. So when the amplifier is
bypassed, it is necessary to switch at least 20us the mux on AIN3 input before starting a
conversion.
Table 44. ADCF Register
ADCA (S:F7h)
ADC Amplifier Configuration
Reset Value = 0000 0000b
AIN3/P4.3
A/D input
Amplification
(programmable gain)
AC3G1
ADCF.7
AC3E
ADCF.5
AC3G0
ADCF.6
Enable
Gain
Average value
extraction
7
6
5
4
3
2
1
0
-
AC3E
AC3G1
AC3G0
Bit
Number
Bit
Mnemonic Description
7-3
-
Not used
2
AC3E
Enable Channel 3 amplifier
Set to enable amplifier.
Clear for Standby mode
1
AC3G1
Channel 3 amplifier gain
AC3G1
AC3G0
0
gain x5
0
1
gain x10
1
0
gain x15
1
gain x20
0
AC3G0
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