ST72321J7-Auto STMicroelectronics, ST72321J7-Auto Datasheet - Page 198
ST72321J7-Auto
Manufacturer Part Number
ST72321J7-Auto
Description
8-bit MCU for automotive with 48 Kbyte Flash, 10-bit ADC, timers, SPI, SCI and I2C interfaces
Manufacturer
STMicroelectronics
Datasheet
1.ST72321R9-AUTO.pdf
(243 pages)
Specifications of ST72321J7-Auto
Hdflash Endurance
100 cycles, data retention 20 years
Clock Sources
crystal/ceramic resonator oscillators, internal RC oscillator and bypass for external clock
4 Power Saving Modes
Halt, Active Halt, Wait and Slow
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Electrical characteristics
19.5.5
198/243
PLL characteristics
Table 119. PLL characteristics
1. Data based on characterization results
The user must take the PLL jitter into account in the application (for example, in serial
communication or sampling of high frequency signals). The PLL jitter is a periodic effect,
which is integrated over several CPU cycles. Therefore, the longer the period of the
application signal, the less it is impacted by the PLL jitter.
Figure 81
4 MHz. At frequencies of less than 125 kHz, the jitter is negligible.
Figure 81. Integrated PLL jitter versus signal frequency
1. Measurement conditions: f
f
Symbol
CPU
f
OSC
/f
CPU
shows the PLL jitter integrated on application signals in the range 125 kHz to
PLL input frequency range
Instantaneous PLL jitter
+/-Jitter (%)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
CPU
Parameter
= 8 MHz
4 MHz
Doc ID 13829 Rev 1
2 MHz
(1)
Application Frequency
1 MHz
f
f
OSC
OSC
Conditions
= 4 MHz
= 2 MHz
500 kHz
(1)
250 kHz
Min
2
Typ
1.0
2.5
ST72321xx-Auto
Max
2.5
4.0
4
MHz
Unit
%
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