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Si4020
 
 
26
 
SIMPLIFIED INTERNAL CONTROL AND TIMING 
The internal controller uses the clock generated by the crystal oscillator to sequentially process the various events and to de-bounce
the push-button (PB) inputs. If the oscillator is not running, internal logic automatically turns it on temporarily and then off again.
Such events are: any wake-up event (POR, PB press, wake-up timer timeout, and low supply voltage detection), PB release and
status read request by the microcontroller.
If two wake-up events occur in succession, the crystal oscillator stays on until the next status read (acknowledgment of the first
event).
Simplified Internal Control and Timing Diagrams
No te:
* Tsx : Crystal oscillator st
artup t ime
** Length of Tclk_tail is determined by the parameter in the Sleep comm
a nd
Vdd
Push-button
inpu t x
Microcontroller mode (ec=0, ex=0)
SPI
Osc_On
(In terna l)
POR
(inte rna l)
Debouncing Time + T    sx*
Status   rd cmd
Status   rd cmd
(PB x)
Stat. b  its
Vdd
SPI
Osc_On
(In terna l)
POR
(inte rna l)
nIRQ
Status   rd cmd
(PO R)
Stat. b  its
Status   rd cmd
(PB x)
Stat. b  its
Microcontroller modewith multiple event read (ec=0, ex=0)
nIRQ
Push-button
inpu t x
1us
Tsx*
(PO R)
Stat. b  its
Tsx*
Tsx*
Vdd
Microcontroller mode (ec=1, ex=0)
SPI
Osc_On
(In terna l)
POR
(inte rna l)
Slee p  cmd
Slee p  cmd
Push-button
inpu t x
Tclk_tail**
Status rd
Status rd
Tclk_tail* *
 
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