MC33975TEKR2 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC33975TEKR2

Multiple Switch Detection Interface with Suppressed Wake-up and 32 mA Wetting Current

Freescale Semiconductor 

TIMING DIAGRAMS

ELECTRICAL CHARACTERISTICS

TIMING DIAGRAMS

CS

SCLK

SI

0.2 VDD

tLEAD

0.7 VDD

0.2 VDD

tSI(SU) tSI(HOLD)

0.7 VDD

0.2 VDD

MSB in

tSO(EN)

SO

0.7 VDD

0.2 VDD

MSB out

tVALID

Figure 4. 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 5. Sleep Mode to Normal Mode Operation

Switch state change with

Switch state change with

INT

CS low generates INT

CS low generates INT

Latch switch status

CS

on falling edge of CS

SGn

SGn Bit in SPI Word

1

Switch

CoSmtamtuasnd

0

Switch

CoSmtamtuasnd

0

Switch

CoSmtamtuasnd

Rising edge of CS does not

clear INT because state change

occurred while CS was low

Switch closed ‚Äö

1

Switch

CoSmtamtuasnd

1

Switch

CoSmtamtuasnd

Figure 6. Normal Mode Interrupt Operation

Switch open ‚Äö

0

Switch

CoSmtamtuasnd

Analog Integrated Circuit Device Data

Freescale Semiconductor

33975

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