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STA1085 Datasheet(PDF) 61 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) 61 Page - STMicroelectronics

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DS13319 Rev 2
61/127
STA108x, STA109x
Electrical Characteristics
126
Figure 4. 32.768 kHz Crystal Connection
To drive the 32.768 kHz crystal pins from an external clock source:
–
Bypass mode (for test). Enable the bypass mode (bit XCOSC32K_BYPASS= 1b in
PMU_CTRL register). Apply external single ended clock at M3_SXTALI. Input
clock should be of CMOS level (Low = GND, High = VDDIO_IO_ON)
–
Force Through Mode. Apply external single ended clock at M3_SXTALI. Input
clock should be of CMOS level (Low = GND, High = VDDIO_IO_ON). Clock is
available after OSC startup time.The node M3_SXTALO must not be tied high as
this may cause large current to enter amplifier and damage it permanently.
4.7.3
24 - 26 MHz Oscillator Specifications
The internal oscillator amplifier specifications are shown in Table 26:
COSXTAL
Shunt capacitance
-
3.5
-
pF
CLSXTAL
Load capacitance(1)
-22
-
pF
1. Total capacitance, including board and package parasitics.
Table 25. Typical Crystal Recommended Specifications (continued)
Symbol
Parameter
Limit values
Unit
Min
Typ
Max
CL
CL
32.768 kHz
Crystal
SXTALI
SXTALO
Device
LMSXTAL RMSXTAL CMSXTAL
COSXTAL
Crystal Model
Table 26. Oscillator Amplifier Specifications
Symbol
Parameter
Limit values
Unit
Min
Typ
Max
TMXTAL
V
Startup Time
-
-
3.4
ms
Tduty cycle(Zi &
NZi)
V
Duty Cycle
40
50
60
%
AMXTALO
V
Amplitude of OSCILLATION at MXTALO
0.4
-
1.6
V
PSXTAL
S
Power Consumption during Stable Oscillation
-
-
8
µA
GM0-MXTAL
P
Transconductance
8.5
-
15.8
mA/V
Rneg
S
Negative Resistance
175
-
285
Fs
S
Frequency Stability
-
-
25
PPM



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