参数资料
型号: STR750FV2H6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 48 MHz, RISC MICROCONTROLLER, PBGA100
封装: 10 X 10 MM, 1.70 MM HEIGHT, ROHS COMPLIANT, LFBGA-100
文件页数: 42/84页
文件大小: 1656K
代理商: STR750FV2H6
STR750Fxx STR751Fxx STR752Fxx STR755Fxx
Electrical parameters
OSC32K crystal / ceramic resonator oscillator
The STR7 RTC clock can be supplied with a 32.768 kHz Crystal/Ceramic resonator
oscillator. All the information given in this paragraph are based on product characterisation
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/ceramic resonator
manufacturer for more details (frequency, package, accuracy...).
Figure 22.
Typical application with a 32.768 kHz crystal or ceramic resonator
PLL characteristics
PLL Jitter Terminology
Self-referred single period jitter (period jitter)
Period Jitter is defined as the difference of the maximum period (Tmax) and minimum
period (Tmin) at the output of the PLL where Tmax is the maximum time difference
between 2 consecutive clock rising edges and Tmin is the minimum time difference
between 2 consecutive clock rising edges.
Self-referred long term jitter (N period jitter)
Self-referred long term Jitter is defined as the difference of the maximum period (Tmax)
and minimum period (Tmin) at the output of the PLL where Tmax is the maximum time
Table 23.
OSC32K crystal / ceramic resonator oscillator
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC32K
Oscillator Frequency
32.768
kHz
RF
Feedback resistor
VDD_IO=3.3 V or 5.0 V
270
310
370
k
Ω
CL1
CL2
Recommended load capacitance
versus equivalent serial resistance of
the crystal or ceramic resonator (RS)
(1)
RS=40KΩ
12.5
15
pF
i2
XT2 driving current
VDD_IO=3.3 V or 5.0 V
VIN=VSS
15
μA
tSU(OSC32K)
(2)
Startup time
VDD_IO is stabilized
2.5
s
1.
The oscillator selection can be optimized in terms of supply current using an high quality resonator with small RS value.
Refer to crystal/ceramic resonator manufacturer for more details
2.
tSU(OSC32K) is the start-up time measured from the moment it is enabled (by software) to a stabilized 32 kHz oscillation is
reached. This value is measured for a standard crystal resonator and it can vary significantly with the crystal/ceramic
resonator manufacturer
XRTC2
XRTC1
fOSC32K
CL1
CL2
i2
RF
STR750
32 kHz
WHEN RESONATOR WITH
INTEGRATED CAPACITORS
RESONATOR
FEEDBACK
LOOP
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