ST72324LK2 STMicroelectronics, ST72324LK2 Datasheet - Page 133
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ST72324LK2
Manufacturer Part Number
ST72324LK2
Description
3V RANGE 8-BIT MCU WITH 8 TO 32K FLASH/ROM, 10-BIT ADC, 4 TIMERS, SPI, SCI INTERFACE
Manufacturer
STMicroelectronics
Datasheet
1.ST72324LK2.pdf
(154 pages)
Specifications of ST72324LK2
Hdflash Endurance
100 cycles, data retention
Clock Sources
crystal/ceramic resonator oscillators, internal RC oscillator, and bypass for external clock
Four Power Saving Modes
Halt, Active-Halt, Wait and Slow
Main Clock Controller With
Real time base, Beep and Clock-out capabilities
16-bit Timer A With
1 input capture, 1 output compare, external clock input, PWM and pulse generator modes
16-bit Timer B With
2 input captures, 2 output compares, PWM and pulse generator modes
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ADC CHARACTERISTICS (Cont’d)
Figure 80. Typical A/D Converter Application
12.12.1 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 some
packages, V
(refer to
alog supply and reference pads are internally
bonded to the V
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
12.12.2 General PCB Design
12.12.2 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
Section 2 on page
V
AIN
AREF
DD
and V
and V
R
AIN
SSA
SS
AREF
7). In this case the an-
pins.
pins are not available
C
Guidelines).
AIN
and V
AINx
SSA
Section
analog
V
DD
– Filter power to the analog power planes. It is rec-
– The analog and digital power supplies should be
– Properly place components and route the signal
V
0.6V
V
0.6V
digital ground plane via a single point on the
PCB.
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
81).
connected in a star nework. Do not use a resis-
tor, as V
the A/D converter and any resistance would
cause a voltage drop and a loss of accuracy.
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.
T
T
AREF
2kΩ(max)
I
±1µA
L
is used as a reference voltage by
10-Bit A/D
Conversion
ST72324Lxx
ST72XXX
Figure
C
12pF
133/154
ADC
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