NRF51822-CFAB-R7 datasheet(42/130 Pages) NORDIC

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Page 42

nRF51822 Product Specification v3.3

8.1.3

32 MHz crystal oscillator (32M XOSC)

Table 23 32 MHz crystal oscillator

Symbol

Description

Note

Min. Typ.

Max.

Units

Test

level

fNOM,X32M

Crystal frequency.

MHz

N/A

fTOL,X32M

Frequency tolerance.1

1. The Frequency tolerance relates to the amount of time the radio can be in transmit mode. See

Table 38 on page 52.

±502

2. Includes initial tolerance of the crystal, drift over temperature, aging and frequency pulling due to incorrect load capac-

itance.

ppm

N/A

fTOL,X32M,BLE

Frequency tolerance, Bluetooth low

energy applications.1

±402

ppm

N/A

RS,X32M

Equivalent series resistance.

C0 ≤ 7 pF, CL,MAX ≤ 12 pF

C0 ≤ 5 pF, CL,MAX ≤ 12 pF

C0 ≤ 3 pF, CL,MAX ≤ 9 pF

100

N/A

PD,X32M

Drive level.

100

μW

N/A

Cpin

Input capacitance on XC1 and XC2

pads.

IX32M

Run current for 32 MHz crystal

oscillator.

SMD 2520 CL = 8 pF

5003

3. This number includes the current used by the automated power and clock management system.

μA

IX32M,1M

Run current for the 32 MHz crystal

oscillator when used only for a

Timer at 1 MHz or less.

SMD 2520 CL = 8 pF

3003

μA

ISTBY,X32M

Standby current for 32 MHz crystal

oscillator.4

4. Standby current is the current drawn by the oscillator when there are no resources requesting the 32M, meaning there

is no clock management active (see

Table 33 on page 49). This value will depend on type of crystal.

SMD 2520 CL = 8 pF

μA

ISTART,XOSC

Startup current for 32 MHz crystal

oscillator.

1.1

tSTART,XOSC

Startup time for 32 MHz crystal

oscillator.

SMD 2520 CL = 8 pF

300

4005

5. Crystals with other specification than SMD 2520 may have much longer startup times.

μs

tSTART,X32M

Total startup time

(tSTART,XOSC + debounce period).

6. This is the time from when the crystal oscillator is powered up until its output becomes available to the system. It

includes both the crystal startup time and the debounce period.

SMD 2520 CL = 8 pF

750

μs

NRF51822-CFAB-R7 Datasheet(PDF) 42 Page - Nordic Semiconductor

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