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| 型號(hào)： | MB96F338RWAPMC-GSE2 |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 48 MHz, MICROCONTROLLER, PQFP144 |
| 封裝： | 20 X 20 MM, 1.70 MM HEIGHT, 0.50 MM PITCH, PLASTIC, LFQFP-144 |
| 文件頁(yè)數(shù)： | 17/134頁(yè) |
| 文件大?。?/td> | 3710K |
| 代理商： | MB96F338RWAPMC-GSE2 |
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MB96330 Series
FME-MB96330 rev 4
113
Accuracy and setting of the A/D Converter sampling time
If the external impedance is too high or the sampling time too short, the analog voltage charged to the internal
sample and hold capacitor is insufcient, adversely affecting the A/D conversion precision.
To satisfy the A/D conversion precision, a sufcient sampling time must be selected. The required sampling time
depends on the external driving impedance Rext, the board capacitance of the A/D converter input pin Cext and
the AVcc voltage level. The following replacement model can be used for the calculation:
The sampling time should be set to minimum “7
τ“. The following approximation formula for the replacement
model above can be used:
Tsamp [min] = 7
× (Rext × (Cext + CIN) + (Rext + RADC) × CADC)
Do not select a sampling time below the absolute minimum permitted value
(0.5
s for 4.5V ≤ AVcc ≤ 5.5V; 1.2 s for 3.0V ≤ AVcc < 4.5V).
If the sampling time cannot be sufcient, connect a capacitor of about 0.1
F to the analog input pin. In this
case the internal sampling capacitance CADC will be charged out of this external capacitance.
A big external driving impedance also adversely affects the A/D conversion precision due to the pin input
leakage current IIL (static current before the sampling switch) or the analog input leakage current IAIN (total
leakage current of pin input and comparator during sampling). The effect of the pin input leakage current IIL
cannot be compensated by an external capacitor.
The accuracy gets worse as |AVRH - AVRL| becomes smaller.
Comparator
Sampling switch
RADC
CADC
Analog
Rext
Cext
input
MCU
Source
Rext: external driving impedance
Cext: capacitance of PCB at A/D converter input
RADC: resistance within MCU: 2.6k
(max) for 4.5V ≤ AVcc ≤ 5.5V
12k
(max) for 3.0V ≤ AVcc < 4.5V
CADC: sampling capacitance within MCU: 10pF (max)
CIN
CIN: capacitance of MCU input pin: 15pF (max)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MB96F338USAPMC-GSE2 | 制造商:FUJITSU 功能描述: 制造商:FUJITSU 功能描述:MCU 16BIT 544K FLASH USB 144LQFP 制造商:FUJITSU 功能描述:MCU, 16BIT, 544K FLASH, USB, 144LQFP 制造商:FUJITSU 功能描述:MCU, 16BIT, 544K FLASH, USB, 144LQFP, Controller Family/Series:MB96330, Core Siz |
| MB96F338USAPMC-GS-N2K5E2 | 功能描述:F2MC-16FX F2MC-16FX MB96330 Microcontroller IC 16-Bit 48MHz 544KB (544K x 8) FLASH 144-LQFP (20x20) 制造商:cypress semiconductor corp 系列:F2MC-16FX MB96330 包裝:托盤 零件狀態(tài):在售 核心處理器:F2MC-16FX 核心尺寸:16-位 速度:48MHz 連接性:CAN，EBI/EMI，I2C，LIN，SCI，UART/USART，USB 外設(shè):DMA，LVD，LVR，POR，PWM，WDT I/O 數(shù):120 程序存儲(chǔ)容量:544KB（544K x 8） 程序存儲(chǔ)器類型:閃存 EEPROM 容量:- RAM 容量:32K x 8 電壓 - 電源（Vcc/Vdd）:3 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 36x10b 振蕩器類型:內(nèi)部 工作溫度:-40°C ~ 105°C（TA） 封裝/外殼:144-LQFP 供應(yīng)商器件封裝:144-LQFP（20x20） 標(biāo)準(zhǔn)包裝:60 |
| MB96F338UWAPMC-GSE2 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB96F338YSAPMC-GSE2 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
| MB96F338YWAPMC-GSE2 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:16-bit Proprietary Microcontroller |
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