Users Manual

Page 38
nRF51802 Product Specification v1.2
8.1.4 16 MHz RC oscillator (16M RCOSC)
Table 22 16 MHz RC oscillator
8.1.5 32.768 kHz crystal oscillator (32k XOSC)
Table 23 32.768 kHz crystal oscillator
Symbol Description Min. Typ. Max. Units
Test
level
f
NOM,RC16M
Nominal frequency. 16 MHz N/A
f
TOL,RC16M
Frequency tolerance. ±1 ±5 % 3
I
RC16M
Run current for 16 MHz RC oscillator.
700
1
1. This number includes the current used by the automated power and clock management system.
μA 1
I
RC16M,1M
Run current for 16 MHz RCOSC when used only for a
Timer at 1 MHz or less.
540
1
μA 1
t
START,RC16M
Startup time for 16 MHz RC oscillator. 4.2 5.2 μs 1
I
RC16M, START
Startup current for 16 MHz RC oscillator. 400 μA 1
Symbol Description Min. Typ. Max. Units
Test
level
f
NOM,X32k
Crystal frequency. 32.768 kHz N/A
f
TOL,X32k,BLE
Frequency tolerance, Bluetooth low energy
applications.
±250 ppm N/A
C
L,X32k
Load capacitance. 12.5 pF N/A
C
0,X32k
Shunt capacitance. 2 pF N/A
R
S,X32k
Equivalent series resistance. 50 80 kΩ N/A
P
D,X32k
Drive level. 1 μW N/A
C
pin
Input capacitance on XL1 and XL2 pads. 4 pF 1
I
X32k
Run current for 32.768 kHz crystal oscillator. 0.7 1 μA 1
I
START,X32k
Startup current for 32.768 kHz crystal oscillator. 1.3 1.8 μA 1
t
START,X32k
Startup time for 32.768 kHz crystal oscillator. 0.3 1 s 2
V
INEXTCLK
Input amplitude if driven by external clock applied to
XL1 pin.
1
1. Leave XL2 pin unconnected.
200
600
2,3
2. The oscillator run current will increase above 1 μA for higher amplitudes.
3. Input signal must not swing outside supply rails.
mV pp 1