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NRF52811-QCAA-R7 Datasheet(PDF) 73 Page - Nordic Semiconductor

Part # NRF52811-QCAA-R7
Description  nRF52811
PDF  444 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52811-QCAA-R7 Datasheet(HTML) 73 Page - Nordic Semiconductor

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Power and clock management
Symbol
Description
Min.
Typ.
Max.
Units
RS_HFXO_7PF
Equivalent series resistance C0 = 7 pF
60
ohm
RS_HFXO_5PF
Equivalent series resistance C0 = 5 pF
60
ohm
RS_HFXO_3PF
Equivalent series resistance C0 = 3 pF
100
ohm
PD_HFXO
Drive level
100
uW
CPIN_HFXO
Input capacitance XC1 and XC2
4
pF
tSTART_HFXO
Startup time
0.36
ms
5.4.4.3 32.768 kHz RC oscillator (LFRC)
Symbol
Description
Min.
Typ.
Max.
Units
fNOM_LFRC
Nominal frequency
32.768
kHz
fTOL_LFRC
Frequency tolerance
±2
%
fTOL_CAL_LFRC
Frequency tolerance for LFRC after calibration11
±500
ppm
tSTART_LFRC
Startup time for 32.768 kHz RC oscillator
600
us
5.4.4.4 32.768 kHz crystal oscillator (LFXO)
Symbol
Description
Min.
Typ.
Max.
Units
fNOM_LFXO
Crystal frequency
32.768
kHz
fTOL_LFXO_BLE
Frequency tolerance requirement for BLE stack
±250
ppm
fTOL_LFXO_ANT
Frequency tolerance requirement for ANT stack
±50
ppm
CL_LFXO
Load capacitance
12.5
pF
C0_LFXO
Shunt capacitance
2
pF
RS_LFXO
Equivalent series resistance
100
kohm
PD_LFXO
Drive level
0.5
uW
Cpin
Input capacitance on XL1 and XL2 pads
4
pF
tSTART_LFXO
Startup time for 32.768 kHz crystal oscillator
0.25
s
VAMP_IN_XO_LOW
Peak to peak amplitude for external low swing clock. Input
signal must not swing outside supply rails.
200
1000
mV
5.4.4.5 32.768 kHz synthesized from HFCLK (LFSYNT)
Symbol
Description
Min.
Typ.
Max.
Units
fNOM_LFSYNT
Nominal frequency
32.768
kHz
fTOL_LFSYNT
Frequency tolerance in addition to HFLCK tolerance12
8
ppm
tSTART_LFSYNT
Startup time for synthesized 32.768 kHz
100
us
11 Constant temperature within ±0.5 °C and calibration performed at least every 8 seconds, defined as 3
sigma
12 Frequency tolerance will be derived from the HFCLK source clock plus the LFSYNT tolerance
4454_140 v1.0
73



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