HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 30 of 111 2019-11-25
4. HARDWARE COMMANDS
Turning ON the HE910
To turn on the HE910 the pad ON_OFF* must be tied low for at least 5 seconds and then
released.
The maximum current that can be drained from the ON_OFF* pad is 0,1 mA.
A simple circuit to do it is:
Figure 4-1 – Turning ON the HE910 1
NOTE:
Don't use any pull up resistor on the ON_OFF* line, it is internally
pulled up. Using pull up resistor may bring to latch up problems on the
HE910 power regulator and improper power on/off of the module. The
line ON_OFF* must be connected only in open collector or open drain
configuration.
NOTE:
In this document all the lines that are inverted, hence have active low
signals are labelled with a name that ends with”#",”*” or with a bar over
the name.
TIP:
To check if the device has powered on, the hardware line PWRMON
should be monitored.
NOTE:
It is mandatory to avoid sending data to the serial ports during the first
200ms of the module start-up.
To Next Page
Loading...
