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參數資料
| 型號： | FMS7401LVN |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Digital Power Controller |
| 中文描述： | 8-BIT, EEPROM, 2.04 MHz, MICROCONTROLLER, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 16/80頁 |
| 文件大小： | 1535K |
| 代理商： | FMS7401LVN |
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FMS7401/7401L
PRODUCT SPECIFICATION
16
REV. 1.0.2 6/23/04
4
ADC Circuit
The Analog-to-Digital Converter (ADC) Circuit extends the features of the FMS7401/7401L by offering a 5-channel 8-bit
ADC. The ADC may be programmed to convert voltages on any of the eight inputs of the analog mux, where five are multi-
function input channels (ACH1-ACH5) and three are used for system calibration. The integrated ADC function offers a single
cost-effective solution for applications requiring voltage, current and temperature sensing. The multifunction input channels
may be configured to perform standard conversions on any of the analog input pins (G4/AIN0, G3/AIN1, G2/AIN2, G3/AIN3
or G7/AIN4). Three of the multifunction input channels may be programmed to perform ADC conversions through the internal
Autozero Amplifier, Uncommitted Amplifier, and Current Source Generator for special control system and battery manage-
ment applications (see
Figure 6
).
The ADC Circuit’s eight analog inputs are software selectable where their analog input voltage is converted with respect to the
internal ADC reference voltage (V
AREF
). V
AREF
may be programmed to use the internal bandgap reference voltage (V
REF
) or
Vcc as its source. By default, the ADC circuit’s V
AREF
is configured to use the internal V
REF
as its source.
1
The ADC performs conversions of 8-bit resolution with accuracy as defined in the
Electrical Characteristics
section of the
datasheet. For a standard ADC conversion, the ADC circuit converts the analog input voltage in a total of 13 conversion clock
cycles, and a total of 20 conversion clock cycles when performing an autozero ADC conversion. To yield a better ADC conver-
sion accuracy, the ADC circuit may configure the ADC clock (F
ADCLK
) to a slower frequency, lengthening the total conversion
time while improving its accuracy. As part of the total conversion time, the ADC circuit completes a sample and hold phase to
measure fast changing analog signals before converting the voltage. An ADC conversion can be initiated by a software com-
mand or automatically (using the gated auto-sampling mode) by the active (on) edge transition of the ADSTROBE PWM
Timer 1 output.
2
If enabled, the ADC circuit offers the use of its microcontroller hardware interrupt (ADCI) triggered after
each completed ADC conversion so that the microcontroller core is freed to perform other tasks.
4.1
Software must access the three memory mapped ADC registers to configure and control the ADC circuit.
3
The ADC Control 1
(ADCNTRL1) register is used to select the analog input channel and ADC reference voltage (V
AREF
) for the conversion. In
addition, it is used to initiate a conversion through software, monitor the ADC pending flag, and enable the ADC circuit’s
microcontroller hardware interrupt (ADCI). The ADC Control 2 (ADCNTRL2) register is used to enable the internal Autozero
Amplifier, Uncommitted Amplifier, Current Source Generator, and/or ADC Auto-sampling Mode. The ADCNTRL2 register is
also used to divide the ADC F
ADCLK
clock to improve the conversion accuracy. Lastly, the ADC Data (ADATA) register is used
by software to read the final converted 8-bit digital value. ADATA is a read only register and is updated automatically at the end
of each ADC conversion.
ADC Circuit Configuration
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| FMS7401LVN14 | 功能描述:8位微控制器 -MCU Int Controller for Ballast RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT |
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