STRT71XF datasheet(65/74 Pages) STMICROELECTRONICS

部件名	STRT71XF

功能描述	ARM7TDMI??32-bit MCU with Flash, USB, CAN 5 timers, ADC, 10 communications interfaces

PDF	74 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

65 / 74 page

STR71xF

Electrical parameters

65/74

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 35).

●

The analog and digital power supplies should be connected in a star network. Do not

use a resistor, as AVDD 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 35. Power Supply Filtering

VSS

V33

0.1

µF

V33

STR710

AVDD

AVSS

POWER

SUPPLY

SOURCE

STR7

DIGITAL NOISE

FILTERING

EXTERNAL

NOISE

FILTERING

1 to 10

µF

0.1

µF

(3.3V)

STRT71XF 数据表(PDF) 65 Page - STMicroelectronics

STRT71XF 数据表(HTML) 65 Page - STMicroelectronics

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