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STR710FZ2 Datasheet(PDF) 42 Page - STMicroelectronics

No. de pieza STR710FZ2
Descripción Electrónicos  ARM7TDMI??32-bit MCU with Flash, USB, CAN 5 timers, ADC, 10 communications interfaces
PDF  74 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STR710FZ2 Datasheet(HTML) 42 Page - STMicroelectronics

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Electrical parameters
STR71xF
42/74
OSC32K Crystal / Ceramic Resonator Oscillator
The STR7 RTC clock can be supplied with a 32kHz Crystal/Ceramic resonator oscillators.
All the information given in this paragraph are based on characterization results with
specified typical external components. In the application, the resonator and the load
capacitors have to be placed as close as possible to the oscillator pins in order to minimize
output distortion and start-up stabilization time. Refer to the crystal resonator manufacturer
for more details (frequency, package, accuracy...).
Notes:
1.
The oscillator selection can be optimized in terms of supply current using an high quality resonator with
small RS value for example MSIV-TIN32.768kHz. Refer to crystal manufacturer for more details
2.
tSU(OSC32KHZ) is the start-up time measured from the moment it is enabled (by software) to a stabilized
32kHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary
significantly with the crystal manufacturer
Figure 15. Typical Application with a 32kHz Crystal
Table 19.
32K Oscillator characteristics (fOSC32K= 32.768kHz)
Symbol
Parameter
Conditions
Typ
Unit
RF
Feedback resistor
2.7
M
Ω
CL1
CL2
Recommended load capacitance
versus equivalent serial resistance
of the crystal (RS)
1)
RS=40KΩ
12.5
pF
i2
RTCXT2 driving current
V33=3.3V
VIN=VSS
3.2
µA
gm
Oscillator Transconductance
8
µA/V
tSU(OSC32KHZ)
2)
startup time
V33 is stabilized
3s
RTCXT2
RTCXT1
fOSC32K
CL1
CL2
i2
RF
STR710
32KHz
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
RESONATOR
FEEDBACK
LOOP



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