33813 Datasheet, PDF (37/54 Pages) Freescale Semiconductor, Inc – One Cylinder Small Engine Control IC

Passive States
Active States
SLEEP
RESETB=1
BATSW = 0
START
RESETB=1
VPWR_UV=1
RESET*
RESETB = 0
BATSW=1
`
NORMAL
RESETB=1
OFF
UV = Under Voltage
OV = Over Voltage
WD = Watch Dog
TD = Time Delay
POR = Power On Reset
& = logic AND
^ = logic OR
! = logic negation
READY TO
SHUT
DOWN
RESETB=1
BATSW = 0
PWREN = 1
SPI_RESET*
RESETB=1
*Configuration Registers reset to default, all outputs off
Figure 18. 33813 Functional State Diagram
Table 14. Operational States
KEYSW
Input
L
H
H
L
PWREN
Input
L
L
H
H
BATSW
Output
L
H
H
L
All
Supplies
OFF
ON
ON
ON
STATE
Sleep
NORMAL
NORMAL
Prepare to shutdown
5.3.3 SLEEP State
Sleep State is entered when the V_BAT level signal is removed from the KEYSW pin and the PWREN SPI bit is a logic low. In
Sleep state all outputs and current sources and sinks are off and the device consumes less than I_VPWR(SS) µA. Applying a V_BAT
level to the KEYSW pin will force the device to exit the Sleep state and generate a POR.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33813
37