參數(shù)資料
型號： ST10F269DIETR
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 32 MHz, MICROCONTROLLER, UUC
封裝： DIE
文件頁數(shù)： 41/161頁
文件大?。?/td> 1595K
代理商： ST10F269DIETR
ST10F269-T3
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-T3 CPU
clock. This allows adjusting the A/D converter of
the ST10F269-T3 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 conversion rate = 6.06s at 32MHz). 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
ADCON.15/14
ADCTC
Conversion Clock tCC
ADCON.13/12
ADSTC
Sample Clock tSC
TCL = 1/2 x fXTAL
At fCPU = 32MHz
tSC =
At fCPU = 32MHz
and ADCTC = 00
00
TCL x 24
0.375
s00
tCC
0.375
s
01
Reserved, do not use
Reserved
01
tCC x 2
0.75
s
10
TCL x 96
1.5
s10
tCC x 4
1.50
s
11
TCL x 48
0.75
s11
tCC x 8
3.00
s
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST10F269-DP 功能描述:16位微控制器 - MCU 16-bit MCU MAC 256 Kbyte Flash RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
ST10F269-DPB 功能描述:16位微控制器 - MCU 16-bit MCU MAC 256 Kbyte Flash RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
ST10F269-DPR 功能描述:16位微控制器 - MCU 16Bit MCU 256K BYTE FLASH,12K BYTE RAM RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
ST10F269DT3 功能描述:16位微控制器 - MCU 16Bit MCU 256K BYTE FLASH,12K BYTE RAM RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
ST10F269DTR3 功能描述:16位微控制器 - MCU 16-bit MCU MAC unit 256 Kbyte Flash RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時鐘頻率:24 MHz 程序存儲器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
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