參數(shù)資料
型號(hào)： STR73XF
廠商： 意法半導(dǎo)體
英文描述： ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
中文描述： ARM7TDMI的32位微控制器的閃存，3倍的CAN，4個(gè)UART，20定時(shí)器，ADC和12通信設(shè)備。接口
文件頁(yè)數(shù)： 46/53頁(yè)
文件大?。?/td> 764K
代理商： STR73XF
Electrical parameters
STR73xF
46/53
Analog Power Supply and Reference Pins
The V
DDA
and V
SSA
pins are the analog power supply of the A/D converter cell. They
act as
the high and low reference voltages for the conversion.
Separation of the digital and analog power pins allow board designers to improve A/D
performance. Conversion accuracy can be impacted by voltage drops and noise in the event
of heavily loaded or badly decoupled power supply lines (see
: General PCB Design
Guidelines
).
General PCB Design Guidelines
To obtain best results, some general design and layout rules should be followed when
designing the application PCB to shield the noise-sensitive, analog physical interface from
noise-generating CMOS logic signals.
Use separate digital and analog planes. The analog ground plane should be connected
to the digital ground plane via a single point on the PCB.
Filter power to the analog power planes. It is recommended to connect capacitors, with
good high frequency characteristics, between the power and ground lines,
placing
0.1μF and optionally, if needed 10pF capacitors as close as possible to the STR7
power supply pins and a 1 to 10μF capacitor close to the power source (see
Figure 23
).
The analog and digital power supplies should be connected in a star network. Do not
use a resistor, as V
DDA
is
used as a reference voltage by the A/D converter and
any
resistance would cause a voltage drop and a loss of accuracy.
Properly place components and route the signal traces on the PCB to shield the analog
inputs. Analog signals paths should run over the analog ground plane and be as short
as possible. Isolate analog signals from digital signals that may switch while the analog
inputs are being sampled by the A/D converter. Do not toggle digital outputs near the
A/D input being converted.
●
●
●
●
Software Filtering of Spurious Conversion Results
For EMC performance reasons, it is recommended to filter A/D conversion outliers using
software filtering techniques.
Figure 23. Power Supply Filtering
V
SS
V
DD
0.1
μ
F
5V
STR73x
V
DDA
V
SSA
POWER
SUPPLY
SOURCE
STR7
DIGITAL NOISE
FILTERING
EXTERNAL
NOISE
FILTERING
1 to 10
μ
F
0.1
μ
F
相關(guān)PDF資料
PDF描述
STR73XF_0609 ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
STR730FZ1H6 ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
STR730FZ1T6 ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
STR730FZ2H6 ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
STR73XF_0609 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:ARM7TDMI 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
STR73XFXX 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:ARM7TDMI⑩ 32-bit MCU with Flash, 3x CAN, 4 UARTs, 20 timers, ADC, 12 comm. interfaces
STR750-D/RAIS 功能描述:開(kāi)發(fā)板和工具包 - ARM 8 BITS MICROCONTR RoHS:否 制造商:Arduino 產(chǎn)品:Development Boards 工具用于評(píng)估:ATSAM3X8EA-AU 核心:ARM Cortex M3 接口類(lèi)型:DAC, ICSP, JTAG, UART, USB 工作電源電壓:3.3 V
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STR750-EVAL 制造商:STMicroelectronics 功能描述:EVAL BOARD STR750F MICROCONTROLLER 制造商:STMicroelectronics 功能描述:EVAL BOARD, STR750F MICROCONTROLLER
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