User's Manual

DOC No: ZB7412-00A-DTS-R03
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Copyright © JORJIN TECHNOLOGIES INC. 2017 21
http://WWW.JORJIN.COM.TW
Crystal frequency tolerance
(2)
-40
+40
ppm
Start-up time
(3)
150
μs
(1) Probing or otherwise stopping the XTAL while the DC-DC converter is enabled may cause permanent damage to the
device.
(2) Includes initial tolerance of the crystal, drift over temperature, aging and frequency pulling due to incorrect load
capacitance. As per Bluetooth specification
(3) Kick-started based on a temperature and aging compensated RCOSC_HF using precharge injection
4.15. 32.768-kHz Crystal Oscillator (XOSC_LF)
over operating free-air temperature range (unless otherwise noted)
Parameter
Test Conditions
Min
Typ
Max
Units
Crystal frequency
32.768
KHz
Initial crystal frequency tolerance, Bluetooth
low energy applications
Tc = 25°C
-20
20
ppm
Crystal aging
-3
3
ppm/year
4.16. 48-MHz RC Oscillator (RCOSC_HF)
Tc = 25°C, VDDS = 3.0 V, unless otherwise noted.
Parameter
Test Conditions
Min
Typ
Max
Units
Frequency
48
MHz
Uncalibrated frequency accuracy
±1
%
Calibrated frequency accuracy
(1)
±0.25
%
Start-up time
5
μs
(1) Accuracy relatively to the calibration source (XOSC_HF).
4.17. 32-kHz RC Oscillator (RCOSC_LF)
Tc = 25°C, VDDS = 3.0 V, unless otherwise noted.
Parameter
Test Conditions
Min
Typ
Max
Units
Calibrated frequency
32.8
KHz
Temperature coefficient
50
ppm/°C