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参数资料
型号： ST10F269Z2Q3
厂商： STMICROELECTRONICS
元件分类： 微控制器/微处理器
英文描述： 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144
封装： 28 X 28 MM, PLASTIC, QFP-144
文件页数： 41/160页
文件大小： 1541K
代理商： ST10F269Z2Q3
ST10F269
135/160
21.3.2 - Conversion Timing Control
When
a
conversion
is
started,
first
the
capacitances of the converter are loaded via the
respective analog input pin to the current analog
input voltage. The time to load the capacitances is
referred to as the sample time ts. Next the
sampled voltage is converted to a digital value in
10 successive steps, which correspond to the
10-bit resolution of the ADC. The next 4 steps are
used for equalizing internal levels (and are kept
for exact timing matching with the 10-bit A/D
converter module implemented in the ST10F168).
The current that has to be drawn from the sources
for sampling and changing charges depends on
the time that each respective step takes, because
the capacitors must reach their final voltage level
within the given time, at least with a certain
approximation. The maximum current, however,
that a source can deliver, depends on its internal
resistance.
The sample time tS (= 2 tSC) and the conversion
time tc (= 14 tCC + 2 tSC + 4 TCL) can be
programmed relatively to the ST10F269 CPU
clock. This allows adjusting the A/D converter of
the ST10F269 to the properties of the system:
Fast
Conversion
can
be
achieved
by
programming
the
respective
times
to
their
absolute possible minimum. This is preferable for
scanning high frequency signals. The internal
resistance of analog source and analog supply
must be sufficiently low, however.
High Internal Resistance can be achieved by
programming the respective times to a higher
value, or the possible maximum. This is preferable
when using analog sources and supply with a high
internal resistance in order to keep the current as
low as possible. However the conversion rate in
this case may be considerably lower.
The conversion times are programmed via the
upper four bit of register ADCON. Bit field ADCTC
(conversion
time
control)
selects
the
basic
conversion clock tCC, used for the 14 steps of
converting. The sample time tS is a multiple of this
conversion time and is selected by bit field
ADSTC (sample time control). The table below
lists the possible combinations. The timings refer
to the unit TCL, where fCPU = 1/2TCL.
A complete conversion will take 14 tCC + 2 tSC + 4 TCL (fastest convertion rate = 4.85s at 40MHz). This
time includes the conversion itself, the sample time and the time required to transfer the digital value to
the result register.
Table 33 : ADC Sampling and Conversion Timing
ADCTC
Conversion Clock tCC
ADSTC
Sample Clock tSC
TCL = 1/2 x fXTAL
At fCPU = 40MHz
tSC =
At fCPU = 40MHz
and ADCTC = 00
00
TCL x 24
0.3
s00
tCC
0.3
s
01
Reserved, do not use
Reserved
01
tCC x 2
0.6
s
10
TCL x 96
1.2
s10
tCC x 4
1.2
s
11
TCL x 48
0.6
s11
tCC x 8
2.4
s
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相关代理商/技术参数
参数描述
ST10F269Z2Q6 功能描述:16位微控制器 - MCU 256K Flash 12K RAM RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
ST10F269Z2Q6/TR 功能描述:16位微控制器 - MCU 16B MCU 256K Byte and 12K Byte RAM RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
ST10F269Z2QX 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:16-BIT MCU WITH MAC UNIT, 256K BYTE FLASH MEMORY AND 12K BYTE RAM
ST10F269Z2T3 功能描述:16位微控制器 - MCU ST10F272 16B MCU RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
ST10F269Z2T6 功能描述:16位微控制器 - MCU ST10F272 16B MCU RoHS:否 制造商:Texas Instruments 核心:RISC 处理器系列:MSP430FR572x 数据总线宽度:16 bit 最大时钟频率:24 MHz 程序存储器大小:8 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:VQFN-40 安装风格:SMD/SMT
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