MC33972A FREESCALE [Freescale Semiconductor, Inc], MC33972A Datasheet - Page 9

• Manufacturer Part Number: MC33972A
• Description: Multiple Switch Detection Interface with Suppressed Wake-Up
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

.
SGn
Analog Integrated Circuit Device Data
Freescale Semiconductor
CS
INT
SGn Bit in SPI Word
VPWR
VDD
WAKE
INT
CS
SGn
Normal Mode
Power-Up
SCLK
CS
SO
SI
t
Command
Tri-State)
SO(EN)
(Disable
Tri-State
0.2 V
Command
Switch
DD
Status
0.7 V
0.2 V
Latch switch status
on falling edge of CS
1
Command
t
DD
DD
Sleep
LEAD
0.7 V
0.2 V
0.7 V
0.2 V
DD
DD
DD
DD
Figure 5. Sleep Mode to Normal Mode Operation
t
SI(SU)
MSB IN
Command
MSB OUT
Figure 6. Normal Mode Interrupt Operation
Switch
Status
Sleep Mode
0
Figure 4. SPI Timing Characteristics
t
SI(HOLD)
TIMING DIAGRAMS
Command
Switch
Status
Normal
Mode
0
Wake-Up From Interrupt
Timer Expire
CS LOW generates INT
Switch state change with
Sleep Command
Rising edge of CS does not
clear
occurred while CS was LOW
Switch closed “1”
INT
Command
t
VALID
Switch
Status
because state change
1
Sleep Mode
ELECTRICAL CHARACTERISTICS
LSB OUT
Command
Switch
Status
t
LAG
1
Normal
Mode
Wake-Up From
Closed Switch
CS LOW generates INT
Switch state change with
TIMING DIAGRAMS
Sleep Command
Switch open “0”
Command
Switch
Status
t
SO(DIS)
0
33972
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