- 您现在的位置：买卖IC网 > PDF目录385871 > ST7285C (意法半导体) 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES PDF资料下载
参数资料
| 型号： | ST7285C |
| 厂商： | 意法半导体 |
| 英文描述： | 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES |
| 中文描述： | 8位微控制器48,000铁路发展策略光盘，3K内存，ADC，两个定时器，2个SPI，I2C和脊髓损伤接口 |
| 文件页数： | 64/117页 |
| 文件大小： | 748K |
| 代理商： | ST7285C |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页第63页当前第64页第65页第66页第67页第68页第69页第70页第71页第72页第73页第74页第75页第76页第77页第78页第79页第80页第81页第82页第83页第84页第85页第86页第87页第88页第89页第90页第91页第92页第93页第94页第95页第96页第97页第98页第99页第100页第101页第102页第103页第104页第105页第106页第107页第108页第109页第110页第111页第112页第113页第114页第115页第116页第117页
64/117
ST7285C
4.6 A/D CONVERTER (ADC)
4.6.1 Introduction
The on-chip Analog to Digital Converter peripheral
is a single 8-bit successive approximation ratio-
metric monotonic ADC, to which up to 8 different
analog voltages (depending on device specifica-
tion as illustrated in Block Diagram) may be ap-
plied from external sources. The result of the con-
version is stored in the 8-bit Data Register. The A/
D converter is controlled through the ADC Control/
Status Register.
4.6.2 Functional Description
The A/D converter is enabled by setting the A/D
Converter ON bit (ADON) in the ADC Control/Sta-
tus Register. A delay time is then required for the
converter to stabilize (typically 10
μ
s, see Electrical
Characteristics)).
When the A/D function is enabled, the associated
pins (see MCU Block Diagram) may be used as
analog inputs. The inputs must first be enabled for
analog input by setting the corresponding bit(s) of
the relevant Port Configuration Register as de-
scribed in the Section on I/O Ports. Bits CH2 to
CH0 of the A/D Converter Control/Status Register
may then be coded to select the channel to be
converted. Using a pin, or pins, as analog inputs
does not affect the ability to read the port as logic
inputs.
The A/D converter may be disabled by resetting
the ADON bit. This feature allows the reduction of
power consumption when no conversion is in
progress. The A/D converter is disabled after Pow-
er-On and external resets.
When enabled, the A/D converter performs a con-
tinuous conversion of the selected channel. When
a conversion is completed (16
μ
s for f
CPU
= 4
MHz), the result is loaded into the read only Result
Data Register and the COCO (Conversion Com-
plete) flag is set. No interrupt is generated. Any
write to the A/D Converter Control/Status Register
aborts the current conversion, resets the COCO
flag and starts a new conversion.
The A/D converter is ratiometric. An input voltage
equal to, or greater than V
DD ,
converts to FFh (full
scale) without overflow indication if greater. An in-
put voltage equal to, or lower than V
SS
converts to
00h. The conversion is monotonic: the results nev-
er decrease if the analog input does not and never
increase if the analog input does not.
The 8-bit conversion is accurate to within 2 LSB.
The minimal conversion time is 32 ADC clock cy-
cles (16
μ
s
if A/D clock frequency at 2 MHz). The
A/D converter clock is generated from the CPU
clock divided by 2.
The high and low level reference voltages are con-
nected to V
DD
and V
SS
. Conversion accuracy may
therefore be degraded by voltage drops and noise
in the event of heavily loaded or badly decoupled
power supply lines.
The A/D converter is not affected by WAIT mode
but, in power sensitive applications, it can be disa-
bled before entering this mode. When the MCU
enters HALT mode with the A/D converter ena-
bled, the A/D clocks are stopped and the converter
is disabled until the HALT mode is exited and the
start-up delay has elapsed. A stabilisation time is
also required before accurate conversions can be
performed.
相关PDF资料 |
PDF描述 |
|---|---|
| ST72T85A5Q6 | 8-BIT MCU FOR RDS WITH 48K ROM, 3K RAM, ADC, TWO TIMERS, TWO SPIs, I2C AND SCI INTERFACES |
| ST730C08L3 | PHASE CONTROL THYRISTORS |
| ST730C08L3L | PHASE CONTROL THYRISTORS |
| ST730C12L0 | PHASE CONTROL THYRISTORS |
| ST730C12L0L | PHASE CONTROL THYRISTORS |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ST7-28B56 | 功能描述:电源变压器 SPLIT BOBBIN HORZ MOUNT XFMR RoHS:否 制造商:Triad Magnetics 功率额定值:12 VA 初级电压额定值:115 V / 230 V 次级电压额定值:12 V / 24 V 安装风格:SMD/SMT 一次绕组:Dual Primary Winding 二次绕组:Dual Secondary Winding 长度:2.5 in 宽度:2 in 高度:1.062 in |
| ST72A | 制造商:DGS 功能描述: |
| ST72C104G1B6 | 功能描述:8位微控制器 -MCU Flash 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| ST72C104G1M1 | 制造商:STMicroelectronics 功能描述:8-BIT MICROCONTROLLER - Bulk |
| ST72C104G1M6 | 功能描述:8位微控制器 -MCU Flash 4K SPI RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
发布紧急采购，3分钟左右您将得到回复。