908E621 datasheet(21/62 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

908E621

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 908E621 was designed and developed as a highly

integrated and cost-effective solution for automotive and

industrial applications. For automotive body electronics, the

908E621 is well suited to perform complete mirror control via

a three-wire LIN bus.

This device combines an HC908EY16 MCU core with

flash memory together with a SmartMOS IC chip. The

SmartMOS IC chip combines power and control in one chip.

Power switches are provided on the SmartMOS IC

configured as half-bridge outputs and three high-side

switches. Other ports are also provided, which include one

Hall-effect sensor input port, one analog input port with a

switched current source, one wake-up terminal, and a

selectable HVDD terminal. An internal voltage regulator

provides power to the MCU chip.

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

communicates using a single wire. This enables this device

to be compatible with three-wire bus systems, where one wire

is used for communication, one for battery, and one for

ground.

FUNCTIONAL TERMINAL DESCRIPTION

See Figure 2, 908E621 Simplified Internal Block Diagram,

page 2, for a graphic representation of the various terminals

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

diagram on page 3 for a depiction of the terminal locations on

the package.

PORT A I/O TERMINALS

These terminals are special-function, bidirectional I/O port

terminals that are shared with other functional modules in the

MCU. PTA0:PTA4 are shared with the keyboard interrupt

terminals, KBD0:KBD4.

The PTA5/SPSCK terminal is not accessible in this device

and is internally connected to the SPI clock terminal of the

analog die.

The PTA6/SS terminal is not accessible in this device and

is internally connected to the SPI slave select input of the

analog die.

For details refer to the 68HC908EY16 datasheet.

PORT B I/O TERMINALS

These terminals are special-function, bidirectional I/O port

terminals that are shared with other functional modules in the

MCU. All terminals are shared with the ADC module.

PTB0/AD0 is internally connected to the ADOUT terminal

of the analog die, allowing diagnostic measurements to be

calculated; e.g., current recopy, VSUP, etc.

The PTB1/AD1, PTB2/AD2, PTB6/AD6/TBCH0, PTB7/

AD7/TBCH1 terminals are not accessible in this device.

For details refer to the 68HC908EY16 datasheet.

PORT C I/O TERMINALS

These terminals are special-function, bidirectional I/O port

terminals that are shared with other functional modules in the

MCU. For example, PTC2:PTC4 are shared with the ICG

module.

PTC0/MISO and PTC1/MOSI are not accessible in this

device and are internally connected to the MISO and MOSI

SPI terminals of the analog die.

For details refer to the 68HC908EY16 datasheet.

PORT D I/O TERMINALS

PTD0/TACH0/BEMF and PTD1/TACH1 are special-

function, bidirectional I/O port terminals that can also be

programmed to be timer terminals.

PTD0/TACH0 terminal is internally connected to the PWM

input of the analog die and only accessible for test purposes

(can not be used in the application).

For details refer to the 68HC908EY16 datasheet.

PORT E I/O TERMINAL

PTE0/TXD and PTE1/RXD are special-function,

bidirectional I/O port terminals that can also be programmed

to be enhanced serial communication.

PTE0/TXD is internally connected to the TXD terminal of

the analog die. The connection for the receiver must be done

externally.

PTE1/RXD is internally connected to the RXD terminal of

the analog die and only accessible for test purposes (can not

be used in the application).

For details refer to the 68HC908EY16 datasheet.

EXTERNAL INTERRUPT TERMINAL (IRQ)

The IRQ terminal is an asynchronous external interrupt

terminal. This terminal contains an internal pullup resistor that

is always activated, even when the IRQ terminal is pulled

LOW.

For details refer to the 68HC908EY16 datasheet.

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