Data Sheet

Confidential
4.12 High-Frequency Crystal
Table 4.12. High-Frequency Crystal
Parameter Symbol Test Condition Min Typ Max Unit
Crystal frequency f
HFXTAL
— 38.4 — MHz
Initial calibrated accuracy ACC
HFXTAL
-10 +/-5 10 ppm
Temperature drift DRIFT
HFXTAL
Across specified temperature
range
-20 — 20 ppm
4.13 Low-Frequency Crystal
Table 4.13. Low-Frequency Crystal
Parameter Symbol Test Condition Min Typ Max Unit
Crystal frequency f
LFXTAL
— 32.768 — kHz
Temperature drift DRIFT
LFXTAL
-40 °C to +85 °C -100 — 100 ppm
-40 °C to +105 °C -150 — 150 ppm
4.14 Precision Low Frequency RC Oscillator (LFRCO)
Table 4.14. Precision Low Frequency RC Oscillator (LFRCO)
Parameter Symbol Test Condition Min Typ Max Unit
Nominal oscillation frequen-
cy
F
LFRCO
— 32.768 — kHz
Frequency accuracy F
LFRCO_ACC
Normal mode -3 — 3 %
Precision mode
1
, across operat-
ing temperature range
2
-500 — 500 ppm
Startup time t
STARTUP
Normal mode — 204 — µs
Precision mode
1
— 11.7 — ms
Current consumption I
LFRCO
Normal mode — 175 — nA
Precision mode
1
, T = stable at 25
°C
3
— 655 — nA
Note:
1. The LFRCO operates in high-precision mode when CFG_HIGHPRECEN is set to 1. High-precision mode is not available in EM4.
2. Includes ± 40 ppm frequency tolerance of the HFXO crystal.
3. Includes periodic re-calibration against HFXO crystal oscillator.
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