33993 데이터 시트보기 (PDF) - Motorola => Freescale

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33993

Multiple Switch Detection Interface

Motorola => Freescale 

WAKE

The WAKE pin is an open-drain output and a wake-up input.

The pin is designed to control a power supply Enable pin. In the

Normal mode, the WAKE pin is low. In the Sleep mode, the

WAKE pin is high. The WAKE pin has a pull-up to the internal

+5.0 V supply.

In Sleep mode with the WAKE pin high, falling edge of WAKE

will place the 33993 in Normal mode. In Sleep mode with VDD

applied, the INT pin must be high for negative edge of WAKE to

wake up the device. If VDD is not applied to the device in Sleep

mode, INT does not affect WAKE operation.

VPWR

The VPWR pin is battery input and Power-ON Reset to the

33993 IC. The VPWR pin requires external reverse battery and

transient protection. Maximum input voltage on VPWR is 50 V.

All wetting, sustain, and internal logic current is provided from

the VPWR pin.

VDD

The VDD input pin is used to determine logic levels on the

microprocessor interface (SPI) pins. Current from VDD is used

to drive SO output and the pull-up current for CS and INT pins.

VDD must be applied for wake-up from negative edge of CS or

INT.

GND

The GND pin provides ground for the IC as well as ground for

inputs programmed as switch-to-battery inputs.

SP0 – SP7

The 33993 device has 8 switch inputs capable of being

programmed to read switch-to-ground or switch-to-battery

contacts. The input is compared with a 4.0 V reference. When

programmed to be switch-to-battery, voltages greater than

4.0 V are considered closed. Voltages less than 4.0 V are

considered open. The opposite holds true when inputs are

programmed as switch-to-ground. Programming features are

defined in Table 1 through Table 6 in the Device Operation

section of this datasheet beginning on page 12. Voltages

greater than the VPWR supply voltage will source current

through the SP inputs to the VPWR pin. Transient battery

voltages greater than 40 V must be clamped by an external

device.

SG0 – SG13

The SGn pins are switch-to-ground inputs only. The input is

compared with a 4.0 V reference. Voltages greater than 4.0 V

are considered open. Voltages less than 4.0 V are considered

closed. Programming features are defined in Table 1 through

Table 6 in the Device Operation section of this datasheet

beginning on page 12. Voltages greater than the VPWR supply

voltage will source current through the SG inputs to the VPWR

pin. Transient battery voltages greater than 40 V must be

clamped by an external device.

33993/D

10

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

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