User Manual

HF-LPB200 Low Power WiFi Module User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
www.hi-flying.com
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Figure 15. Multi-TCP Link Data Transmition Structure
3.6. Power Save Scheme
HF-LPB200 module can work at three modes based on different power save scheme:
Normal Mode (Active/Sleep) - AP Associated, Wi-Fi ON/OFF based on internal control
Wi-Fi Wakeup Mode (Standby) - AP Associated, MCU OFF, Wi-Fi wakeup
Deep Sleep Mode (Shutdown) - Non AP Associated, Wi-Fi Shut dwon, MCU Sleep
Pin/Timer Wakeup
Normal Mode (Active/Sleep) Normal mode means Wi-Fi circuitry works at IEEE PS mode and MCU
circuitry work at normal mode. That‟s the default working mode for HF-LPB200 to communication with
outside and no data transceiving latency.
Wi-Fi Wakeup Mode (Standby) allows the MCU circuitry to be powered down and still keep Wi-Fi AP
associated, which save more power compared with normal mode and module can be wake up through
Wi-Fi at network server side.
Deep Sleep Mode (Shutdown) allows the Wi-Fi circuitry and MCU circuitry to be powered down,
which results in the lowest sleep current, but at the expense of longer wake up times. This is due to the
module associating with the access point every time when it wakes up. The intent of this option is to
allow for longer sleep times. Deep sleep mode can trigger Sleep_RQ pin to go in.
The Difference between Wi-Fi Wakeup and Deep Sleep mode as follows:
Table 6 Difference between Wi-Fi Wakeup Mode and Standb Deep Sleep Mode
Module Status
Wake Up Method
Wi-Fi
MCU
Current
UART
GPIO
Timeout
AT Com.
Wi-Fi
Wi-Fi Wakeup
ON
OFF
<10mA
OFF
Yes
Yes
No
Yes
Deep Sleep
OFF
OFF
1mA
OFF
Yes
Yes
No
No
Following typical measurement parameters can be used for select suitable power save scheme based
on the real application case: