ST72F324BJ STMICROELECTRONICS [STMicroelectronics], ST72F324BJ Datasheet - Page 146

• Manufacturer Part Number: ST72F324BJ
• Description: 8-bit MCU, 3.8 to 5.5 V operating range with 8 to 32 Kbyte Flash/ROM, 10-bit ADC, 4 timers, SPI, SCI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Electrical characteristics
146/188
32 Kbyte Flash and ROM devices
Table 95.
1. The oscillator selection can be optimized in terms of supply current using an high quality resonator with
2. Data based on characterization results, not tested in production. The relatively low value of the RF resistor,
3. For C
Figure 67. Typical application with a crystal or ceramic resonator (32 Kbyte Flash
Symbol
When resonator with
integrated capacitors
f
C
C
OSC
R
small RS value. Refer to crystal/ceramic resonator manufacturer for more details.
offers a good protection against issues resulting from use in a humid environment, due to the induced
leakage and the bias condition change. However, it is recommended to take this point into account if the
microcontroller is used in tough humidity conditions.
designed for high-frequency applications and selected to match the requirements of the crystal or
resonator. C
capacitance which is the series combination of C
included when sizing C
capacitance).
i
2
L1
L2
F
L1
Oscillator frequency
Feedback resistor
Recommended load
capacitance versus equivalent
serial resistance of the crystal or
ceramic resonator (R
OSC2 driving current
and C
Crystal and ceramic resonator oscillators (32 Kbyte Flash and ROM
devices)
and ROM devices)
L1
L2
and C
C
L2
it is recommended to use high-quality ceramic capacitors in the 5-pF to 25-pF range (typ.)
Parameter
L2
C
L1
, are usually the same size. The crystal manufacturer typically specifies a load
L1
and C
(2)
(1)
S
L2
)
(3)
Resonator
(10 pF can be used as a rough estimate of the combined pin and board
OSC2
OSC1
f
f
f
f
V
OSC
OSC
OSC
OSC
DD
L1
= 5V, V
and C
= 1 to 2 MHz
= 2 to 4 MHz
= 4 to 8 MHz
= 8 to 16 MHz
R
Conditions
F
L2
V
IN
. PCB and MCU pin capacitance must be
DD
ref
= V
/2
LP oscillator
MP oscillator
MS oscillator
HS oscillator
SS
i
2
amplifier
Linear
Min
20
20
20
15
15
1
f
OSC
Feedback
loop
Typ
160
310
610
80
ST72XXX
Power down
Max Unit
ST72324B
150
250
460
910
16
40
60
50
35
35
logic
MHz
kΩ
pF
µA