Product Specs

Table Of Contents
19 CLOCK Clock control
Page
109
19.4 Electrical specification
19.4.1 64 MHz internal oscillator (HFINT)
Symbol
Description
Min.
Typ.
Max.
Units
f
NOM_HFINT
Nominal output frequency
64
MHz
f
TOL_HFINT
Frequency tolerance
<±1.5
<±6
%
I
HFINT
Run current
60
µA
I
START_HFINT
Average startup current
I_HFINT
µA
t
START_HFINT
Startup time
3
us
19.4.2 64 MHz crystal oscillator (HFXO)
Symbol
Description
Min.
Typ.
Max.
Units
f
NOM_HFXO
Nominal output frequency
64
MHz
f
XTAL_HFXO
External crystal frequency
32
MHz
f
TOL_HFXO
Frequency tolerance requirement for 2.4 GHz proprietary radio
applications
±60
ppm
f
TOL_HFXO_BLE
Frequency tolerance requirement, Bluetooth low energy
applications
±40
ppm
C
L_HFXO
Load capacitance
12
pF
C
0_HFXO
Shunt capacitance
7
pF
R
S_HFXO_7PF
Equivalent series resistance C0 = 7 pF
60
ohm
R
S_HFXO_5PF
Equivalent series resistance C0 = 5 pF
80
ohm
R
S_HFXO_3PF
Equivalent series resistance C0 = 3 pF
100
ohm
P
D_HFXO
Drive level
100
uW
C
PIN_HFXO
Input capacitance XC1 and XC2
4
pF
I
STBY_X32M
Core standby current
13
50
µA
I
HFXO
Run current
250
µA
I
START_HFXO
Average startup current, first 1 ms
0.4
mA
t
START_HFXO
Startup time
0.36
ms
19.4.3 32.768 kHz RC oscillator (LFRC)
Symbol
Description
Min.
Typ.
Max.
Units
f
NOM_LFRC
Nominal frequency
32.768
kHz
f
TOL_LFRC
Frequency tolerance
±2
%
f
TOL_CAL_LFRC
Frequency tolerance for LFRC after calibration
14
±250
ppm
I
LFRC
Run current for 32.768 kHz RC oscillator
0.6
1
µA
t
START_LFRC
Startup time for 32.768 kHz RC oscillator
600
us
19.4.4 32.768 kHz crystal oscillator (LFXO)
Symbol
Description
Min.
Typ.
Max.
Units
f
NOM_LFXO
Crystal frequency
32.768
kHz
f
TOL_LFXO_BLE
Frequency tolerance requirement for BLE stack
±250
ppm
f
TOL_LFXO_ANT
Frequency tolerance requirement for ANT stack
±50
ppm
C
L_LFXO
Load capacitance
12.5
pF
C
0_LFXO
Shunt capacitance
2
pF
R
S_LFXO
Equivalent series resistance
100
kohm
P
D_LFXO
Drive level
1
uW
C
pin
Input capacitance on XL1 and XL2 pads
4
pF
I
LFXO
Run current for 32.768 kHz crystal oscillator
0.25
µA
13
Current drawn if HFXO is forced on through for instance using the low latency power mode.
14
Constant temperature within ±0.5 °C and calibration performed at least every 8 seconds