33993 查看數據表（PDF） - Motorola => Freescale

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33993

Multiple Switch Detection Interface

Motorola => Freescale 

CS

SCLK

SI

Timing Diagrams

0.2 VDD

tlead

0.7 VDD

0.2 VDD

tSI(su) tSI(hold)

0.7 VDD

0.2 VDD

MSB in

SO

tSO(en)

0.7 VDD

0.2 VDD

MSB out

tvalid

Figure 2. SPI Timing Characteristics

tlag

LSB out

tSO(dis)

VPWR

VDD

WAKE

INT

CS

SGn

Power-Up Tri-State

Sleep

Normal Mode Command Command

(Disable Tri-State)

Sleep Mode

Wake-Up From Interrupt

Timer Expire

Wake-Up From

Closed Switch

Normal

Mode

Sleep Command Sleep Mode

Normal

Mode

Sleep Command

Figure 3. Sleep Mode to Normal Mode Operation

INT

CS

Latch switch status

on falling edge of CS

Switch state change with

CS low generates INT

Switch state change with

CS low generates INT

SGn

SGn Bit in SPI Word

1

Switch

Status

Command

0

Switch

Status

Command

0

Switch

Status

Command

Rising edge of CS does not

clear INT because state change

occurred while CS was low

Switch closed “1”

1

Switch

Status

Command

1

Switch

Status

Command

Switch open “0”

0

Switch

Status

Command

33993/D

8

Figure 4. Normal Mode Interrupt Operation

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

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