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参数资料
| 型号： | STR910FAM42X6T |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 96 MHz, RISC MICROCONTROLLER, QFP80 |
| 封装： | LQFP-80 |
| 文件页数： | 65/100页 |
| 文件大小： | 1801K |
| 代理商： | STR910FAM42X6T |
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STR91xFAxxx
Electrical characteristics
67/103
7.7.3
RTC clock generated from a crystal/ceramic resonator
The RTC (Real-Time Clock) can be supplied with a 32.768 kHz crystal/ceramic resonator
oscillator. All the information given in this paragraph is based on characterization results
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 startup stabilization time. Refer
to the crystal resonator manufacturer for more details on the resonator characteristics
(frequency, package, accuracy).
Note:
For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5 pF to 16
pF range, selected to match the requirements of the crystal or resonator. CL1 and CL2, are
usually the same size. The crystal manufacturer typically specifies a load capacitance which
is the series combination of CL1 and CL2.
Load capacitance CL has the following formula:
CL = CL1 x CL2 / (CL1 + CL2) + Cstray
where Cstray is the pin capacitance and board or trace PCB-related capacitance. Typically,
it is between 2 pF and 7 pF.
Caution:
Never use a resonator with a load capacitance of 12.5 pF.
Example: if you choose a resonator with a load capacitance of CL = 6 pF, and Cstray = 2 pF,
then CL1 = CL2 = 8 pF.
Conditions: VDDQ = 2.7 - 3.6V, VDD = 1.65 - 2V, TA = -40 / 85 °C unless otherwise specified.
Table 20.
RTC oscillator electrical characteristics
Symbol
Parameter
Test
conditions
Value
Unit
Min
Typ
Max
RF
External feedback resistor
22
M
Ω
VSTART(RTC) Oscillator start voltage
VDD_LVD+
(1)
1.
Refer to Table 14 for min. value of VDD_LVD+
V
gM
Oscillator transconductance(2)
2.
Data based on bench measurements, not tested in production.
Start-up
1.8
A/Volts
tSTUP(RTC)
Oscillator Start-up Time(2)
VDD stable
1
S
Table 21.
RTC crystal electrical characteristics
Symbol
Parameter
Value
Unit
Min
Typ
Max
fO
Resonant frequency
32.768
kHz
RS
Series resistance
40
k
Ω
CL
Load capacitance
8
pF
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相关代理商/技术参数 |
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| STR910FAW32X6 | 功能描述:ARM微控制器 - MCU 256 + 32 64 RAM KB CAN EMI 80 I/O RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 处理器系列:STM32F373xx 数据总线宽度:32 bit 最大时钟频率:72 MHz 程序存储器大小:256 KB 数据 RAM 大小:32 KB 片上 ADC:Yes 工作电源电压:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作温度范围:- 40 C to + 85 C 封装 / 箱体:LQFP-48 安装风格:SMD/SMT |
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