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33975 Datasheet(PDF) 20 Page - Freescale Semiconductor, Inc

Part # 33975
Description  Multiple Switch Detection Interface with Suppressed Wake-up and 32 mA Wetting Current
PDF  32 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

33975 Datasheet(HTML) 20 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
20
Freescale Semiconductor
33975
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
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 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
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
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
98765
43210
Switch Status
Command
000
00000
X
X
X
XXXXX
XXXXX
XXX
Settings
Command
Bat=1, Gnd=0
(Default state = 1)
000
00001
X
X
X
XXXXX
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
Wake-up/Interrupt
Bit
Wake-up=1
Nonwake-up=0
(Default state = 1)
000
00010
X
X
X
XXXXX
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
000
00011
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0
Metallic
Command
Metallic = 1
Non-metallic = 0
(Default state = 1)
000
00100
X
X
X
XXXXX
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
000
00101
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0
Analog Command
000
00110
X
X
X
XXXXX
X
32m
A
0
4.0
mA
0
00000
Wetting Current
Timer
Enable Command
Timer ON = 1
Timer OFF = 0
(Default state = 1)
000
00111
X
X
X
XXXXX
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
000
01000
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0
Tri-state
Command
Input Tri-state=1
000
01001
X
X
X
XXXXX
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
000
01010
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0
Calibration
Command
(Default state -
uncalibrated)
000
01011
X
X
X
XXXXX
XXXXX
XXX
Sleep Command
(See Sleep Mode
on page 21)
000
01100
X
X
X
XXXXX
XX
int
time
r
int
time
r
int
time
r
sca
n
time
r
sca
n
time
r
sca
n
time
r
Reset Command
011
11111
X
X
X
XXXXX
XXXXX
XXX
SO Response Will
Always Send
ther
m
flg
RST
flg
SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0 SG1
3
SG1
2
SG1
1
SG1
0
SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0



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