CC3100_15 Datasheet, PDF (16/44 Pages) Texas Instruments – CC3100 SimpleLink Wi-Fi Network Processor, Internet-of-Things Solution for MCU Applications

CC3100
SWAS031D – JUNE 2013 – REVISED FEBRUARY 2015
4.11.2.3 Wakeup from Hibernate
Figure 4-8 shows the timing diagram for wakeup from the hibernate state.
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Figure 4-8. nHIB Timing Diagram
NOTE
The 32.768-kHz XTAL is kept enabled by default when the chip goes to hibernate in response to
nHIB being pulled low.
Table 4-4 describes the timing requirements for nHIB.
Table 4-4. nHIB Timing Requirements
Item
Name
Description
Min
Typ
Max
T_{hib_min}
T_{wake_from_hib}
Minimum hibernate
time
Hardware wakeup
time plus firmware
initialization time
Minimum pulse width
of nHIB being low⁽¹⁾
See ⁽²⁾.
10 ms
50 ms
(1) Ensure that the nHIB pulse width is kept above the minimum requirement under all conditions (such as power up, MCU reset, and so
on).
(2) If temperature changes by more than 20°C, initialization time from HIB can increase by 200 ms due to radio calibration.
4.11.3 Clock Specifications
The CC3100 device requires two separate clocks for its operation:
• A slow clock running at 32.768 kHz is used for the RTC.
• A fast clock running at 40 MHz is used by the device for the internal processor and the WLAN subsystem.
The device features internal oscillators that enable the use of cheaper crystals rather than dedicated TCXOs for
these clocks. The RTC can also be fed externally to provide reuse of an existing clock on the system and reduce
overall cost.
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Specifications
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