33910 datasheet(66/90 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DESCRIPTION

INTRODUCTION

MC33910BAC / MC34910BAC

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 33910 is designed and developed as a highly

integrated and cost-effective solution for automotive and

industrial applications. For automotive body electronics, the

33910 is well suited to perform keypad applications via the

LIN bus.

Two power switches are provided on the device configured

as high side outputs. Other ports are also provided, which

include a wake-up capable pin amd a Hall Sensor port

supply. An internal voltage regulator provides power to a

MCU device.

Also included in this device is a LIN physical layer, which

communicates using a single wire. This enables this device

to be compatible with 3-wire bus systems, where one wire is

used for communication, one for battery, and one for ground.

FUNCTIONAL PIN DESCRIPTION

See Table 1, 33910 Simplified Application Diagram, for a

graphic representation of the various pins referred to in the

following paragraphs. Also, see the 33910 Pin Connections

for a description of the pin locations in the package.

RECEIVER OUTPUT (RXD)

The RXD pin is a digital output. It is the receiver output of

the LIN interface and reports the state of the bus voltage:

RXD low when LIN bus is dominant, RXD high when LIN bus

is recessive.

TRANSMITTER INPUT (TXD)

The TXD pin is a digital input. It is the transmitter input of

the LIN interface and controls the state of the bus output

(dominant when TXD is Low, recessive when TXD is High).

This pin has an internal pull-up to force recessive state in

case the input is left floating.

LIN BUS (LIN)

The LIN pin represents the single-wire bus transmitter and

receiver. It is suited for automotive bus systems and is

compliant to the LIN bus specification 2.0.

The LIN interface is only active during Normal and Normal

Request modes.

SERIAL DATA CLOCK (SCLK)

The SCLK pin is the SPI clock input pin. MISO data

changes on the negative transition of the SCLK. MOSI is

sampled on the positive edge of the SCLK.

MASTER OUT SLAVE IN (MOSI)

The MOSI digital pin receives SPI data from the MCU. This

data input is sampled on the positive edge of SCLK.

MASTER IN SLAVE OUT (MISO)

The MISO pin sends data to an SPI-enabled MCU. It is a

digital tri-state output used to shift serial data to the

microcontroller. Data on this output pin changes on the

negative edge of the SCLK. When CS is High, this pin will

remain in high-impedance state.

CHIP SELECT (CS)

CS is a active low digital input. It must remain low during a

valid SPI communication and allow for several devices to be

connected in the same SPI bus without contention. A rising

edge on CS signals the end of the transmission and the

moment the data shifted in is latched. A valid transmission

must consist of 8 bits only.

While in STOP mode a low-to-high level transition on this

pin will generate a wake-up condition for the 33910.

ANALOG MULTIPLEXER (ADOUT0)

The ADOUT0 pin can be configured via the SPI to allow

the MCU A/D converter to read the several inputs of the

Analog Multiplexer, including the L1 input voltage and the

internal junction temperature.

PWM INPUT CONTROL (PWMIN)

This digital input can control the high sides in Normal

Request and Normal mode.

To enable PWM control, the MCU must perform a write

operation to the high side control register (HSCR).

This pin has an internal 20

μA current pull-up.

RESET (RST)

This bidirectional pin is used to reset the MCU in case the

33910 detects a reset condition or to inform the 33910 that

the MCU has just been reset. After release of the RST pin

Normal Request mode is entered.

The RST pin is an active low filtered input and output

formed by a weak pull-up and a switchable pull-down

structure which allows this pin to be shorted either to VDD or

to GND during software development without the risk of

destroying the driver.

33910 Datasheet(PDF) 66 Page - Freescale Semiconductor, Inc

33910 Datasheet(HTML) 66 Page - Freescale Semiconductor, Inc

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