33813 datasheet(6/54 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

33813

O2HSENSP

Input

O2 Heater Current

Sense Input Positive

Positive input to the O2 heater current sense differential amplifier

Used to measure current in of O2 heater driver MOSFET source resistor, if

used.

VRSOUT

Output

VRS Conditioned

Output

5.0 V Logic Level Output from conditioned VRS differential inputs VRSP,

VRSN

VRSP

Input

Variable Reluctance

Sensor Positive Input

The VRSP and VRSN form a differential input for the Variable Reluctance

Sensor attached to the crankshaft toothed wheel.

VRSN

Input

Variable Reluctance

Sensor Negative

Input

The VRSP and VRSN form a differential input for the Variable Reluctance

Sensor attached to the crankshaft toothed wheel.

CSB

Input

SPI Chip Select

The Chip Select input pin is an active low signal sent by the MCU to indicate

that the device is being addressed.

VPWR

Supply Input Main Voltage Supply

Input

VPWR is the main voltage supply input for the device. Connected to a 12 Volt

battery (Should have reverse battery protection and adequate transient

protection.)

SCLK

Input

SPI Clock Input

The SCLK input pin is used to clock in and out the serial data on the SI and

SO pins while being addressed by the CSB.

Input

SPI Data Input

The SI input pin is used to receive serial data into the device from the MCU.

VPPREF

Output

VPP Reference Base

Drive

Base drive for external PNP pass transistor

GND

Ground

Ground pin, return for all voltage supplies

Output

SPI Data Output

The SO output pin is used to transmit serial data from the device to the MCU.

VCC

Supply

VCC Supply

Protected Output

5.0 Volt supply output for MCU VCC. This output supplies the VCC voltage

for 5.0 Volt MCUs. It is short-circuit and over-current protected.

VPPSENS

Input

Voltage Sense from

VPP

Feedback to internal VPP 6.5 Volt regulator from external pass transistor

RESETB

Output

RESETB Output to

MCU

5.0 V Logic level reset signal used to reset the MCU during under and over-

voltage conditions and for initial power-up, down and watchdog timeouts

VPROT

Output

Sensor Supply

Protected Output

The VPROT Output is a protected 5.0 Volt output that tracks the VCC voltage

but isolates the VCC output against shorts to ground and to battery. It is

intended to supply sensors which are located off of the ECU board.

LAMPOUT

Output

Warning Lamp Output Low side driver output for MIL (warning lamp) driven by SPI input command

RGND2

Ground

ROUT2 Power

Ground

Ground connection for ROUT 2 low side driver. Must be tied to VPWR

Ground.

ROUT2

Output

Relay Driver 2 Output Low side relay driver output # 2 driven by SPI input command or RIN2 logic

input

N.C.

No Connect

Unused pin

For future expansion

N.C.

No Connect

Unused pin

For future expansion

TACHOUT

Output

Tachometer output

This pin provides the low side drive for a tachometer gauge or alternatively as

a SPI controlled low side driver, or oscillator output.

MRX

Output

Low Side Driver

Output

Output 5.0 V logic level ISO9141 data to the MCU from the ISO9141 IN/OUT

MTX

Input

ISO9141 MCU Data

Input

Input 5.0 V logic level ISO9141 data from the MCU to the ISO9141 IN/OUT

Table 2. 33813 Pin Definitions

A functional description of each pin can be found in the Functional Pin Description section beginning on page 24.

Pin Name

Function

Formal Name

Description

33813 Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc

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