MC33975A 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC33975A

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

Freescale Semiconductor 

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

Table 14. Reset Command

Reset Command

Command Bits

23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 1 1 1 1 1 1 1XXXXXXXXXXXXXXXX

SPI COMMAND SUMMARY

Table below provides a comprehensive list of SPI

commands recognized by the 33975 and the reset state of

each register. Table 16 and Table 17 contain the Serial

Output (SO) data for input voltages greater or less than the

threshold level. Open switches are always indicated with a

logic [0], closed switches are indicated with logic [1].

Table 15. SPI Command Summar

MSB

Command Bits

Setting Bits

LSBI

23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Switch Status

Command

0 0 0 0 0 0 0 0XXXXXXXXXXXXXXXX

Settings

Command

0 0 0 0 0 0 0 1 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0

Bat=1, Gnd=0

(Default state = 1)

Wake-up/Interrupt 0 0 0 0 0 0 1 0 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0

Bit

Wake-up = 1

Nonwake-up = 0

0 0 0 0 0 0 1 1 X X SG1 SG1 SG1 SG1 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

3210

(Default state = 1)

Metallic

Command

Metallic = 1

Non-metallic = 0

00

00

00

00

01

01

0 0 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0

0 1 X X SG1 SG1 SG1 SG1 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

3210

(Default state = 1)

Analog Command 0 0 0 0 0 1 1 0 X X X X X X X X X 32m 4.0 0 0 0 0 0

A mA

00

Wetting Current

0 0 0 0 0 1 1 1 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0

Timer

Enable Command 0 0 0 0 1 0 0 0 X X SG1 SG1 SG1 SG1 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

Timer ON = 1

3210

Timer OFF = 0

(Default state = 1)

Tri-state

0 0 0 0 1 0 0 1 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0

Command

Input Tri-state=1 0 0 0 0 1 0 1 0 X X SG1 SG1 SG1 SG1 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

3210

Calibration

Command

(Default state -

uncalibrated)

0 0 0 0 1 0 1 1XXXXXXXXXXXXXXXX

Sleep Command 0 0 0 0 1 1 0 0 X X X X X X X X X X int int int sca sca sca

(See Sleep Mode

time time time n n n

on page 21)

r r r time time time

rrr

Reset Command 0 1 1 1 1 1 1 1 X X X X X X X X X X X X X X X X

SO Response Will ther RST SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SG1 SG1 SG1 SG1 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

Always Send

m flg

3210

flg

33975

20

Analog Integrated Circuit Device Data

Freescale Semiconductor

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