參數(shù)資料
型號： VMX51C900
廠商： Electronic Theatre Controls, Inc.
英文描述： Versa Mix 8051 MCU with LCD Controller and ADC
中文描述： 8051反之亦然混合與LCD控制器和ADC的微控制器
文件頁數(shù)： 31/55頁
文件大?。?/td> 2395K
代理商： VMX51C900
VMX51C900
______________________________________________________________________________________________
www.ramtron.com
page 31 of 55
Analog-to-Digital Converter (ADC)
The VMX51C900 includes a 4-channel, 8-bit A/D
converter. ADC inputs are shared with I/O ports P3.4
to P3.7. The ADC derives its reference from the supply
voltage.
F
IGURE
18:
ADC
SRUCTURE
ADC
VDD
P3.4 / ADCIN0
P3.5 / ADCIN1
P3.6 / ADCIN2
P3.7 / ADCIN3
P3.4
ADCIN0
P3.5
P3.6
P3.7
ADCIN3
ADCIN1
ADCIN2
ADCCH(1:0)
ADCIEN(3:0)
ADCDATA(7:0)
ADCLK(1:0)
ADCCONT
ADCEND
The ADC binary output represents the ratio of the
analog voltage at its input vs. the VMX51C900 supply
as shown in the following figure:
F
IGURE
19:
ADC
OUTPUT VS
.
ANALOG VOLTAGE PRESENT AT ITS INPUTS
0V
VDD
1 LSB = VDD / 256
OUTPUT
CODE
1111_1111
1111_1110
1111_1101
1111_1100
0000_0000
0000_0001
0000_0010
0000_0011
The following formula is used to calculate the ADC
conversion result based on input and supply voltages.
ADCresult = Vin * 256
Vsupply
When the ADC input voltage exceeds the supply
voltage, the ADC conversion result will saturate at
0FFh. When the voltage is lower than the
VMX51C900’s ground reference, the ADC conversion
result will remain at 00h.
Configuring the VMX51C900 ADC
The configuration and use of the VMX51C900 A/D
Converter involves the following steps:
Activate the ADC Input
Set the ADC Control Register
Set the ADC Interrupts (if required)
Collect the ADC Data
The VMX51C900 ADC shares its inputs with the upper
nibble of Port 3. Writing a 1 into a given ADCIENx bit
of
the
P3IOCTRL
register
corresponding I/O pins as ADC inputs. When the
ADCIENx bit remains at 0, the P3 pins can be used as
general purpose I/Os.
When the Port 3 pins are configured as ADC inputs,
writing to the corresponding P3 register bits will not
affect device operation, while reading these port pins
will return the port register values.
configures
the
T
ABLE
29:
P
ORT
3
C
ONFIGURATION
R
EGISTER
(P3IOCTRL,
9D
H
)
7
ADCIEN3
ADCIEN2
3
-
Bit
Mnemonic
7
ADCIEN3
6
5
4
ADCIEN1
1
-
ADCIEN0
0
-
2
-
Description
ADC Input 3 Enable
0 = P3.7 I/O
1 = ADC input 3
ADC Input 2 Enable
0 = P3.6 I/O
1 = ADC input 2
ADC Input 1 Enable
0 = P3.5 I/O
1 = ADC input 1
ADC Input 0 Enable
0 = P3.4 I/O
1 = ADC input 0
Unused
6
ADCIEN2
5
ADCIEN1
4
ADCIEN0
3:0
-
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VMX51C900-25-L 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT
VMX51C900-25-LG 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT
VMX51C900-25-L-G 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Versa Mix 8051 MCU with LCD Controller and ADC
VMX51C900-25-P 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT
VMX51C900-25-PG 功能描述:8位微控制器 -MCU 8K+256 25MHz 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) 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(fēng)格:SMD/SMT
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