SI4020 查看數據表（PDF） - Silicon Laboratories

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SI4020

Universal ISM Band FSK Transmitter

Silicon Laboratories 

Simultaneously Pressed Push-Button Detect by Microcontroller

Microcontroller mode

Vdd

POR

(internal)

Push button

input 1

Push button

input 2

nIRQ

SPI

POR

Status rd

PB1

PB_nIRQdly*

Status rd

PB1

Status rd

PB2

Status rd

PB1

PB2

PB1

Status rd

Status rd

Status rd

Note:

*PB_nIRQdly is equal with the

debounce time

Si4020

Simplified Block Diagram of Push-Button 1–4 Inputs

VDD

WEAK PULL-UP

ENABLE/DISABLE

bc

VDD

POR, LBD, WAKE UP TIMER,

P. BUTTONS EVENT FLAGS

DQ

Push-button1,2,3

Digital glitch

CLK

filter

CLR for P.B1,2

CLR

Internal

blocker signal

to

Push-button1

and

Push-button2

p4

Push-button1

Push-button2

Push-button4

With internal weak pull-up

To Digital glitch filter for

Push-button4

Notice:

Only one EVENT is

serviced simultaneously

the others are pending.

EVENT FLAG

SLEEP Command *

STAT. REG. READ Command **

COUNT/SINGLE

b1, b2, b3

Note:

* In EEprom mode

** In uC controlled mode

17

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