33993 Datasheet, PDF (16/28 Pages) Freescale Semiconductor, Inc – Multiple Switch Detection Interface

FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
SPI COMMAND SUMMARY
Table 14 below provides a comprehensive list of SPI
commands recognized by the 33993 and the reset state of
each register. Table 15 and Table 16 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. SPI Command Summary
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
Bat=1, Gnd=0 0 0 0 0 0 0 0 1 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
(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
(Default state = 1)
0
0
0
0
0
1
1
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
Metallic Command 0 0 0 0 0 1 0 0 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
Metallic = 1
Non-metallic = 0
0
(Default state = 1)
0
0
0
0
1
0
1
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
16m 2.0m
Analog Command 0 0 0 0 0 1 1 0 X X X X X X X X X A A 0 0 0 0 0
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
Timer ON = 1
Timer OFF = 0
0
0
0
0
1
0
0
0
X
X
SG1
3
SG1
2
SG1
1
SG1
0
SG9
SG8
SG7
SG6
SG5
SG4
SG3
SG2
SG1
SG0
(Default state = 1)
Tri-State Command 0 0 0 0 1 0 0 1 X X X X X X X X SP7 SP6 SP5 SP4 SP3 SP2 SP1 SP0
Input Tri-State = 1
Input Active = 0 _{0 0 0 0 1 0 1 0 X X} SG1 SG1 SG1 SG1 _{SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0}
(Default state = 1)
3210
Calibration
Command
(Default state -
uncalibrated)
0 0 0 0 1 0 1 1XXXXXXXXXXXXXXXX
Sleep Command
int int int scan scan scan
(See Sleep Mode 0
on page 17)
0
0
0
1
1
0
0
X
X
X
X
X
X
X
X
X
X
timer timer timer timer timer timer
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 ^them
Always Send _flg
int
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
33993
16
Analog Integrated Circuit Device Data
Freescale Semiconductor