參數(shù)資料
型號(hào)： ST72521BM6
英文描述： ST72521B - 80/64-PIN 8-BIT MCU WITH 32 TO 60K ROM. FIVE TIMERS. SPI. SCI. I2C. CAN INTERFACE
中文描述： ST72521B - 80/64-PIN 8位32至60,000 ROM的微處理器。 5個(gè)定時(shí)器。的SPI。脊髓損傷。 I2C總線。 CAN接口
文件頁(yè)數(shù)： 183/198頁(yè)
文件大小： 2504K
代理商： ST72521BM6
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ST72521B
183/198
ADC CHARACTERISTICS
(Cont’d)
11.13.1 Analog Power Supply and Reference
Pins
Depending on the MCU pin count, the package
may feature separate V
AREF
and V
SSA
analog
power supply pins. These pins supply power to the
A/D converter cell and function as the high and low
reference voltages for the conversion. In some
packages, V
AREF
and V
SSA
pins are not available
(refer to
Section 2 on page 8
). In this case the an-
alog supply and reference pads are internally
bonded to the V
DD
and V
SS
pins.
Separation of the digital and analog power pins al-
low 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
Section
11.13.2 General PCB Design Guidelines
).
11.13.2 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 an-
alog 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 rec-
ommended 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 ST7 power supply pins and a 1 to 10μF ca-
pacitor close to the power source (see
Figure
108
).
– The analog and digital power supplies should be
connected in a star nework. Do not use a resis-
tor, as V
AREF
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 out-
puts on the same I/O port as the A/D input being
converted.
Figure 108. Power Supply Filtering
V
SS
V
DD
0.1
μ
F
10pF
V
DD
ST72XXX
V
AREF
V
SSA
POWER
SUPPLY
SOURCE
ST7
DIGITAL NOISE
FILTERING
EXTERNAL
NOISE
FILTERING
1 to 10
μ
F
0.1
μ
F
10pF
(if needed)
(if needed)
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