33911 datasheet(20/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 33911 was designed and developed as a highly

integrated and cost-effective solution for automotive and

industrial applications. For automotive body electronics, the

33911 is well suited to perform relay control in applications

like window lift, sunroof, etc. via a LIN bus.

Power switches are provided on the device configured as

high side and low side outputs. Other ports are also provided,

which include a voltage sense port and two wake-up capable

pins. 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 Figure 1, 33911 Simplified Application Diagram,

page 1, for a graphic representation of the various pins

referred to in the following paragraphs. Also, see the pin

diagram on page 3 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 a 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 an 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.

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 VSENSE, L1, L2 input

voltages and the internal junction temperature.

PWM INPUT CONTROL (PWMIN)

This digital input can control the high side and low side

drivers in Normal Request and Normal Mode.

To enable PWM control, the MCU must perform a write

operation to the High Side Control Register (HSCR), or the

Low Side Control Register (LSCR).

This pin has an internal 20

µA current pull-up.

RESET (RST)

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

33911 detects a reset condition, or to inform the 33911 that

the MCU was just 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.

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