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NRF52820-QDAA-R Datasheet(PDF) 69 Page - Nordic Semiconductor

Part # NRF52820-QDAA-R
Description  nRF52820
PDF  437 Pages
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Manufacturer  NORDIC [Nordic Semiconductor]
Direct Link  https://www.nordicsemi.com/
Logo NORDIC - Nordic Semiconductor

NRF52820-QDAA-R Datasheet(HTML) 69 Page - Nordic Semiconductor

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Power and clock management
5.3.8.5 USB operating conditions
Symbol
Description
Min.
Typ.
Max.
Units
VBUS
Supply voltage on VBUS pin
4.35
5
5.5
V
VDPDM
Voltage on D+ and D- lines
VSS - 0.3
VUSB33
+ 0.3
V
5.3.8.6 USB regulator specifications
Symbol
Description
Min.
Typ.
Max.
Units
IUSB,QUIES
USB regulator quiescent current drawn from VBUS (USBD
enabled)
170
µA
tUSBPWRRDY
Time from USB enabled to USBPWRRDY event triggered,
VBUS supply provided
1
ms
VUSB33
On voltage at the USB regulator output (DECUSB pin)
3.0
3.3
3.6
V
RSOURCE,VBUS
Maximum source resistance on VBUS, including cable
2
Ω
CDECUSB
Decoupling capacitor on the DECUSB pin
2.35
4.7
5.5
µF
5.3.8.7 VBUS detection specifications
Symbol
Description
Min.
Typ.
Max.
Units
VBUS,DETECT
Voltage at which rising VBUS gets reported by USBDETECTED
3.4
4.0
4.3
V
VBUS,REMOVE
Voltage at which decreasing VBUS gets reported by
USBREMOVED
3.0
3.6
3.9
V
5.4 CLOCK — Clock control
The clock control system can source the system clocks from a range of internal or external high and low
frequency oscillators and distribute them to modules based upon a module’s individual requirements.
Clock distribution is automated and grouped independently by module to limit current consumption in
unused branches of the clock tree.
Listed here are the main features for CLOCK:
• 64 MHz on-chip oscillator
• 64 MHz crystal oscillator, using external 32 MHz crystal
• 32.768 kHz +/-500 ppm RC oscillator
• 32.768 kHz crystal oscillator, using external 32.768 kHz crystal
• 32.768 kHz oscillator synthesized from 64 MHz oscillator
• Firmware (FW) override control of crystal oscillator activity for low latency start up
• Automatic internal oscillator and clock control, and distribution for ultra-low power
4463_156 v1.0
69



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