33975 datasheet(19/32 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33975

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

EXAMPLE OF NORMAL MODE OPERATION

The operation of the device in Normal Mode is defined by

the states of the programmable internal control registers. A

typical application may have the following settings:

• Programmable Switch – Set to Switch-to-Ground

• All Inputs Set as Wake-Up

• Wetting Current On (32 mA)

• Wetting Current Timer On (20 ms)

• All inputs Tri-State-Disabled (comparator is active)

• Analog select 00000 (no input channel selected)

With the device programmed as above, an interrupt will be

generated with each switch contact change of state (open-to-

close or close-to-open) and 32 mA of contact wetting current

will be source for 20 ms. The INT terminal will remain low until

switch status is acknowledged by the microprocessor. It is

Analog Command

000001

XXXXXX

XXX

32mA

4.0m

000

Wetting Current Timer

Enable Command

Timer ON = 1

Timer OFF = 0

(Default state = 1)

000001

XXXXXX

SP7

SP6

SP5

SP4

SP3

SP2

SP1

SP0

000010

SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

Tri-State Command

Input Tri-State=1

Input Active = 0

000010

XXXXXX

SP7

SP6

SP5

SP4

SP3

SP2

SP1

SP0

000010

SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

Calibration Command

(Default state -

uncalibrated)

000010

XXXXXX

XXXXX

Sleep Command

(See Sleep

Mode on page

20)

000011

XXXXXX

XXXX

int

timer

int

timer

int

timer

scan

timer

scan

timer

scan

timer

Reset Command

011111

XXXXXX

XXXXX

SO Response Will

Always Send

therm

flg

RST

flg

SP7

SP6

SP5

SP4

SP3

SP2

SP1

SP0 SG13 SG12 SG11 SG10 SG9 SG8 SG7 SG6 SG5 SG4 SG3 SG2 SG1 SG0

MSB

Command Bits

Setting Bits

LSBI

Table 16. Serial Output (SO) Bit Data

Type of Input

Input

Programmed

Voltage on

Input terminal

SO SPI Bit

Switch to Ground

SPn < 4.0 V

Switch to Ground

SPn > 4.0 V

Switch to Battery

SPn < 4.0 V

Switch to Battery

SPn > 4.0 V

N/A

SGn < 4.0 V

N/A

SGn > 4.0 V

Table 17. Serial Output (SO) Response Register

SO Response Will

Always Send

therm

flg

RST

flg

SP7

SP6

SP5

SP4

SP3

SP2

SP1

SP0 SG13 SG12 SG11 SG10 SG9

SG8

SG7

SG6

SG5

SG4

SG3 SG2 SG1 SG0

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