ST72361AR9-Auto STMicroelectronics, ST72361AR9-Auto Datasheet - Page 254

• Manufacturer Part Number: ST72361AR9-Auto
• Description: 8-bit MCU for automotive with K Flash, 10-bit ADC, 5 Timers, SPI, 2x LINSCI
• Manufacturer: STMicroelectronics

Specifications of ST72361AR9-Auto

• Hdflash Endurance: 100 cycles, data retention 20 years at 55 °C
• 5 Power Saving Modes: halt, auto wake up from halt, active halt, wait and slow

Electrical characteristics
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Analog power supply and reference pins
Depending on the MCU pin count, the package may feature separate V
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 smaller packages V
are not available and the analog supply and reference pads are internally bonded to the V
and 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
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.
●
●
●
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Software filtering of spurious conversion results
For EMC performance reasons, it is recommended to filter A/D conversion outliers using
software filtering techniques.
Figure 122. Power supply filtering
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.
SS
pins.
POWER
SUPPLY
SOURCE
V
DD
DDA
1 to 10µF
is used as a reference voltage by the A/D converter and any
Doc ID 12468 Rev 3
ST7
DIGITAL NOISE
FILTERING
EXTERNAL
NOISE
FILTERING
0.1µF
0.1µF
V
V
V
V
SS
DD
DDA
SSA
ST72XXX
General PCB design
DDA
DDA
ST72361xx-Auto
and V
Figure
and V
SSA
145).
SSA
analog
pins
DD