参数资料
型号: EM260-RCM-USART-R
厂商: Silicon Laboratories Inc
文件页数: 19/50页
文件大小: 0K
描述: EM260 RCM BOARD
标准包装: 12
类型: 收发器,802.15.4/Zigbee
频率: 2.4GHz
适用于相关产品: EM260
其它名称: 636-1025
EM260
The 1.8V POR cell holds the main digital core in reset until the regulator output voltage rises above a
threshold.
Additionally, the digital domain counts 1,024 clock edges on the 24MHz crystal before releasing the reset to
the main digital core.
Table 11 lists the features of the EM260 POR circuitry.
Table 11. POR Specifications
Parameter
VDD_PADS POR release
VDD_PADS POR assert
1.8V POR release
1.8V POR hysteresis
Min.
1.0
0.5
1.35
0.08
Typ.
1.2
0.6
1.5
0.1
Max.
1.4
0.7
1.65
0.12
Unit
V
V
V
V
4.11 Clock Sources
The EM260 integrates two oscillators: a high-frequency 24MHz crystal oscillator and a low-frequency internal
10kHz RC oscillator.
4.11.1 High-Frequency Crystal Oscillator
The integrated high-frequency crystal oscillator requires an external 24MHz crystal with an accuracy of
±40ppm. Based upon the application Bill of Materials and current consumption requirements, the external
crystal can cover a range of ESR requirements. For a lower ESR, the cost of the crystal increases but the
overall current consumption decreases. Likewise, for higher ESR, the cost decreases but the current
consumption increases. Therefore, the designer can choose a crystal to fit the needs of the application.
Page 19
120-0260-000M Rev 1.1
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