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STA1085 Datasheet(PDF) 60 Page - STMicroelectronics

Part # STA1085
Description  Accordo2 family – Automotive dual core processor for car radio and display audio application
PDF  127 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA1085 Datasheet(HTML) 60 Page - STMicroelectronics

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Electrical Characteristics
STA108x, STA109x
60/127
DS13319 Rev 2
4.7
AC Characteristics
4.7.1
Oscillator Electrical Specifications
This device contains two oscillators:
a 32.768 kHz oscillator
a 24-26 MHz oscillator
Each requires a specific crystal, with parameters that must be as close as possible to the
following recommended values.
Clock from external source can also be applied on input pins.
4.7.2
32.768 kHz Oscillator Specifications
The internal oscillator amplifier specifications are shown in Table 24:
The 32.768 kHz oscillator is connected between M3_SXTALI (oscillator amplifier input) and
M3_SXTALO (oscillator amplifier output). It also requires two external capacitors of CL pF,
as shown on Figure 4.
The specifications of a typical external crystal are shown in Table 25:
Table 24. Oscillator Amplifier Specifications
Symbol
Parameter
Limit Values
Unit
Min
Typ
Max
TSXTAL
V
Startup Time
-
15 x Lm/Rm
1.5
s
Tduty
cycle(Zi &
NZi)
V
Duty Cycle
40
50
60
%
ASXTALO
V
Amplitude of OSCILLATION at
M3_SXTALO
1.6
-
2.6
V
PSXTAL
S
Power Consumption during
Stable Oscillation
-10
-
µA
GM0-SXTAL
P
Transconductance
28
-
56
A/V
Rneg
S
Negative Resistance
350
-
500
k
Fs
S
Frequency Stability
-
-
25
PPM
Table 25. Typical Crystal Recommended Specifications
Symbol
Parameter
Limit values
Unit
Min
Typ
Max
FSXTAL
SR
Crystal frequency
-
32.768
-
kHz
LMSXTAL
Motion inductance
-
11.8
-
mH
CMSXTAL
Motional capacitance
-
2.0
-
fF
RMSXTAL
Motional resistance
-
50
-
k



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