PXN20 Datasheet, PDF (38/60 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Electrical characteristics
Table 18. 5V low frequency (128 kHz) internal RC oscillator
Spec
Characteristic
1 Frequency before trim¹
2 Frequency after loading factory trim²
3 Application trim resolution³
4 Application frequency trim step³
5 Startup Time
1 _{Across process, voltage, and temperature.}
2 _{Across voltage and temperature.}
3 _{Fixed voltage and temperature.}
Symbol Range
Min
Typ
F_ut128
35%
83.2
128
F_t128
7%
119.0
128
T_s128
—
—
—
F_s128
—
—
4
S_t128
—
—
—
Max
Unit
172.8
kHz
137.0
kHz
2
%
—
kHz
100
s
4.10 FMPLL electrical characteristics
Table 19. FMPLL electrical specifications¹
Spec
Characteristic
1 System Frequency²
2 PLL Reference Frequency Range
3 PLL Frequency
Symbol
f_SYS
f_REF
f_PLL
4 Loss of Reference Frequency ³
5 Self Clocked Mode Frequency
6 _{PLL Lock Time}⁴
7 _{Duty Cycle of Reference}
8 Frequency un-LOCK Range
9 Frequency LOCK Range
10 ^{CLKOUT Period Jitter,5 Measured at fSYS Max}
Cycle-to-cycle Jitter
11 CLKOUT Jitter at  50 µs period
12 _{Peak-to-Peak Frequency Modulation Range Limit} ^6,7
(f_SYSMax must not be exceeded)
13 FM Depth Tolerance⁸
14 _{VCO Frequency}⁹
15 _{Modulation Rate Limits}¹⁰
1 _{VDDSYN = 3.0 V to 3.6 V, VSS = VSSSYN = 0 V, TA = TL to TH.}
f_LOR
f_SCM
t_LPLL
t_DC
f_UL
f_LCK
C_Jitter
C_Jitter
C_mod
C_{mod_err}
f_VCO
f_MOD
Min
—
4
-----^f--^v---^c--^o---^--^m---ⁱ--ⁿ---^-----
ERFD + 1
100
16
—
40
–4.0
–2.0
–5
–250
0
–0.50
192
0.400
Max
Unit
116
MHz
40
MHz
MHz
2000
64
400
60
4.0
2.0
5
250
4
0.50
600
1
kHz
MHz
s
%
% f_SYS
% f_SYS
%f_SYS
ns
%f_SYS
%f_SYS
MHz
MHz
PXN20 Microcontroller Data Sheet, Rev. 1
38
Freescale Semiconductor