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ATSAMB11XR 데이터시트(PDF) 20 Page - Microchip Technology

부품명 ATSAMB11XR
상세설명  Ultra Low Power BLE 4.1 SiP/Module
PDF  87 Pages
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제조업체  MICROCHIP [Microchip Technology]
홈페이지  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATSAMB11XR 데이터시트(HTML) 20 Page - Microchip Technology

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Table 6-3. RTC XO Interface
Pin Name
Function
Register Default
Digital Control Pins
Pierce_res_ctrl
Control feedback resistance value:
0 = 20 MOhm Feedback resistance
1 = 30 MOhm Feedback resistance
0X4000F404<15>=’1’
Pierce_cap_ctrl<3:0> Control the internal tuning capacitors with step of
700 fF:
0000=700 fF
1111=11.2 pF
Refer to crystal datasheet to check for optimum
tuning cap value
0X4000F404<23:20>=”1000”
Pierce_gm_ctrl<3:0> Controls the Gm stage gain for different crystal
mode:
0011= for crystal with shunt capacitance of 1.2 pF
1000= for crystal with shunt capacitance of >3 pF
0X4000F404<19:16>=”1000”
VDD_XO
1.2V
6.3.3
RTC Characterization with Gm Code Variation at Supply 1.2V and Temp. = 25°C
This section shows the RTC total drawn current and the XO accuracy versus different tuning capacitors
and different GM codes, at a supply voltage of 1.2V and temperature = 25°C.
Figure 6-3. RTC Drawn Current vs. Tuning Caps at 25°C
ATSAMB11XR/ZR
© 2017 Microchip Technology Inc.
Datasheet Preliminary
DS70005342A-page 20



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