Eurotech BitsyXb - Environmental Specifications; Electrical Specifications; Reset, Sleep, Wakeup

BitsyXb - User Manual
56 110118-0001A
6.2 Environmental Specifications
The following are environmental specifications for the BitsyXb single-board computer.
Symbol
Parameter
Min
Typ.
Max
Units
Operating temperature -40 +85
°
C
6.3 Electrical Specifications
This section provides electrical specifications for the BitsyXb single-board computer.
6.3.1 Reset, Sleep, Wakeup
Absolute Maximum Ratings
Reset Input (/RESET_IN) ............................ 3.6 V (note 1)
Wakeup Input (/RQOnOff) ......................... 5.5 V (note 2)
Symbol
Parameter
Min
Typ.
Max
Units
/RESET_IN (J10.45)
Vrst
trigger voltage (Note 3)
2.7
V
Vprst
pull-up voltage
Vddx
V
Rprst
pull-up resistance
47
kΩ
Sleep (5.3.3)
Vsleep
Sleep trigger voltage (Note 4)
5.4
5.8
V
Vsleep,hyst
Sleep trigger release hysteresis
(Note 5)
0.06 0.25 V
Wakeup: /RQOnOff (J3.45)
trq
wakeup pulse duration (Note 6)
100
ms
Vprq
pull-up voltage
Vddx
V
Rprq
pull-up resistance
11
kΩ
Notes:
1. The reset controller can support operating voltages up to 10 VDC. However, such high
voltages on Vddx through the pull-up resistor may damage the system.
2. The /RQOnOff signal is connected to the system controller, which determines this rating
(see section 6.3.7).
3. Short /RESET_IN to GND to reset system.
4. This is the voltage at VBATT_POS at which the DC_GOOD signal (section 4.3.7) changes
from high to low, which can trigger the system to go into Sleep mode. Sleep trigger at
DCIN_POS is Vsleep+Vdin (section 6.3.4).
5. Important! Once Vsleep has been triggered, the input voltage must rise at least
Vsleep,hyst above Vsleep before the voltage detector will restore the DC_GOOD signal.
Make sure that your input voltage is designed to always run above Vsleep+Vsleep,hyst, or
systems that go to sleep may not be able to wake again.
6. Short /RQOnOff to GND for at least trq to wake up system. A low-level voltage on
/RQOnOff initiates wakeup.