Datasheet
ST7LITE0xY0, ST7LITESxY0
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13.3.4 Internal RC Oscillator and PLL
The ST7 internal clock can be supplied by an internal RC oscillator and PLL (selectable by option byte).
The RC oscillator and PLL characteristics are temperature-dependent and are grouped in two tables.
13.3.4.1 Devices with “6” order code suffix (tested for T
A
= -40 to +85°C) @ V
DD
= 4.5 to 5.5V
Notes:
1. If the RC oscillator clock is selected, to improve clock stability and frequency accuracy, it is recommended to place a
decoupling capacitor, typically 100nF, between the V
DD
and V
SS
pins as close as possible to the ST7 device.
2. See “INTERNAL RC OSCILLATOR ADJUSTMENT” on page 24
3. Data based on characterization results, not tested in production
4. Averaged over a 4ms period. After the LOCKED bit is set, a period of t
STAB
is required to reach ACC
PLL
accuracy
5. After the LOCKED bit is set ACC
PLL
is max. 10% until t
STAB
has elapsed. See Figure 13 on page 25.
6. Guaranteed by design.
Symbol Parameter Conditions Min Typ Max Unit
V
DD(RC)
Internal RC Oscillator operating voltage 2.4 5.5
VV
DD(x4PLL)
x4 PLL operating voltage 2.4 3.3
V
DD(x8PLL)
x8 PLL operating voltage 3.3 5.5
t
STARTUP
PLL Startup time 60
PLL input clock (f
PLL
)
cycles
Symbol Parameter Conditions Min Typ Max Unit
f
RC
1)
Internal RC oscillator fre-
quency
RCCR = FF (reset value), T
A
=25°C, V
DD
=5V 760
kHz
RCCR = RCCR0
2 )
,T
A
=25°C, V
DD
=5V 1000
ACC
RC
Accuracy of Internal RC
oscillator with
RCCR=RCCR0
2)
T
A
=25°C,V
DD
=4.5 to 5.5V -1 +1%
T
A
=-40 to +85°C, V
DD
=5V -5 +2 %
T
A
=0 to +85°C, V
DD
=4.5 to 5.5V -2
3)
+2
3)
%
I
DD(RC)
RC oscillator current con-
sumption
T
A
=25°C,V
DD
=5V 970
3)
µA
t
su(RC)
RC oscillator setup time T
A
=25°C,V
DD
=5V 10
2)
µs
f
PLL
x8 PLL input clock 1
3)
MHz
t
LOCK
PLL Lock time
5)
2ms
t
STAB
PLL Stabilization time
5)
4ms
ACC
PLL
x8 PLL Accuracy
f
RC
= 1MHz@T
A
=25°C, V
DD
=4.5 to 5.5V 0.1
4)
%
f
RC
= 1MHz@T
A
=-40 to +85°C, V
DD
=5V 0.1
4)
%
t
w(JIT)
PLL jitter period f
RC
= 1MHz 8
6)
kHz
JIT
PLL
PLL jitter (∆f
CPU
/f
CPU
)1
6)
%
I
DD(PLL)
PLL current consumption T
A
=25°C 600
3)
µA
1