33975 datasheet(12/32 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33975

FUNCTIONAL DESCRIPTIONS

FUNCTIONAL TERMINAL DESCRIPTION

WAKE INPUT (WAKE)

The WAKE terminal is an open-drain output and a wake-up

input. The terminal is designed to control a power supply

Enable terminal. In the Normal mode, the WAKE terminal is

low. In the Sleep mode, the WAKE terminal is high. The

WAKE

terminal has a pull-up to the internal +5.0 V supply.

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

WAKE

will place the 33975 in Normal mode. In Sleep mode

with VDD applied, the INT terminal 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.

LOAD SUPPLY VOLTAGE (VPWR)

The VPWR terminal is battery input and Power-ON Reset

to the 33975 IC. The VPWR terminal 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 terminal.

LOGIC VOLTAGE (VDD)

The VDD input terminal is used to determine logic levels

on the microprocessor interface (SPI) terminals. Current from

VDD is used to drive SO output and the pull-up current for CS

and INT terminals. VDD must be applied for wake-up from

negative edge of CS or INT.

GROUND (GND)

The GND terminal provides ground for the IC as well as

ground for inputs programmed as switch-to-battery inputs.

PROGRAMMABLE SWITCHES (SP0–SP7)

The 33975 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 6 through Table 11 in the Functional

Device Operation section of this datasheet beginning on

page 14. Voltages greater than the VPWR supply voltage will

source current through the SP inputs to the VPWR terminal.

Transient battery voltages greater than 38/40 V must be

clamped by an external device.

SWITCH-TO-GROUND (SG0–SG13)

The SGn terminals 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 6 through Table 11 in the Functional Device Operation

section of this datasheet beginning on page 14. Voltages

greater than the VPWR supply voltage will source current

through the SG inputs to the VPWR terminal. Transient

battery voltages greater than 38/40 V must be clamped by an

external device.

33975 Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

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