User Manual

Apollo3 Blue Datasheet
DS-A3-0p9p1 Page 778 of 909 2019 Ambiq Micro, Inc.
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21.4 Power Mode Transitions
21.5 Clocks/Oscillators
Table 1148: BLE Crystal Oscillator
Table 1146: Power Mode Transitions
Symbol Parameter Min Typ Max Unit
Buck mode
T
RUN_TO_SLEEP
Run to Sleep mode transition time - 100 - ns
T
RUN_TO_DEEPSLEEP
Run mode to Deep Sleep mode transition time - TBD - µs
T
SLEEP_TO_RUN
Sleep to Run mode transition time - 220 - ns
T
DEEPSLEEP_TO_RUN
Deep-Sleep to Run mode transition time - 15 - µs
LDO mode
T
RUN_TO_SLEEP
Run to Sleep mode transition time - 100 - ns
T
RUN_TO_DEEPSLEEP
Run mode to Deep Sleep mode transition time - TBD - µs
T
SLEEP_TO_RUN
Sleep to Run mode transition time - 220 - ns
T
DEEPSLEEP_TO_RUN
Deep-Sleep to Run mode transition time - 15 - µs
Table 1147: Clocks/Oscillators
Symbol Parameter Test Conditions Min Typ Max Unit
F
HFRC
HFRC frequency - 48 - MHz
F
LFRC
LFRC frequency - 1024 - Hz
F
XT
XT frequency - 32.768 - kHz
DC
HFRC
HFRC duty cycle 50 %
C
INX
Internal XI/XO pin capacitance 3.4 pF
C
EXT_X-
T_TOL
Allowed external XI/XO pin capacitance
per pin
-- 7pF
F
OF
XT oscillator failure detection frequency 8 kHz
OA
XT
XT oscillation allowance
At 25°C using a 32.768 kHz
tuning fork crystal
320 - kΩ
Symbol Parameter Test Conditions Min Typ Max Unit
F
XTAL
Crystal frequency 32 MHz
∆F
XTAL
Frequency tolerance
Untrimmed; include initial
tolerance/aging/tempera-
ture drift
-40 40 ppm
C
L
Crystal load capacitance 8 pF
ESR Equivalent serial resistance 100 Ohms
T
XTAL
Startup time 1ms