st7pmc2s6 STMicroelectronics, st7pmc2s6 Datasheet - Page 349

• Manufacturer Part Number: st7pmc2s6
• Description: 8-bit Mcu For Automotive With Nested Interrupts, Flash, 10-bit Adc, Brushless Motor Control, 5 Timers, Spi, Linsci?
• Manufacturer: STMicroelectronics

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto
12.14.1
12.14.2
Figure 160. Typical application with ADC
Analog power supply and reference pins
Depending on the MCU pin count, the package may feature separate V
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
V
analog supply and reference pads are internally bonded to the V
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
design guidelines on page
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.
SSA
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 ST7 power
supply pins and a 1 to 10µF capacitor close to the power source (see
The analog and digital power supplies should be connected in a star network. Do not
use a resistor, as V
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 on the
same I/O port as the A/D input being converted.
pins are not available (refer to
V
V
AIN
DD
0.1µF
R
AIN
C
AIN
AREF
AINx
V
V
AREF
SSA
349).
is used as a reference voltage by the A/D converter and any
R
AREF
Section 2: Pin description on page
V
DD
V
0.6V
V
0.6V
T
T
2k max
I
±1µA
L
Section 12.14.2: General PCB
DD
Electrical characteristics
10-bit A/D
conversion
and V
AREF
21). In this case the
ST7MC1K2-Auto
ST7MC1K6-Auto
ST7MC2S4-Auto
ST7MC2S6-Auto
SS
Figure
and V
pins.
AREF
C
6pF
161).
ADC
SSA
349/371
and