908E621_08 Datasheet, PDF (24/65 Pages) Freescale Semiconductor, Inc – Integrated Quad Half-bridge and Triple High Side with Embedded MCU and LIN for High End Mirror

FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
MM908E621 - Functional Block Diagram
SMARTMOS Analog Control IC
Internal Regulators & Safety
Voltage Regulation
Reset, IRQ & Wake-up
Switched VDD
Watchdog Timer
Control & Interface
Hall Sensor Interface
Analog Multiplexer
LIN Interface
SPI Interface & PWM Control
Analog Input w/Integrated Current Source
Outputs
High Side Drivers & Diagnostics
H-Bridge Drivers & Diagnostics
MC68HC908EY16 Core
M68HC08 CPU
w/ ALU, RAM, Flash ROM
Power Module
w/Power-On Reset
Internal Clock Module
10-Bit ADC Module
I/O Ports A, B, C, D, E
Timer Modules
Communication Modules
Reset & IRQ
Internal Regulators & Safety
Control & Interface
Outputs
MC68HC908EY16 Core
SMARTMOS ANALOG CONTROL IC
INTERNAL REGULATORS & SAFETY:
VOLTAGE REGULATION
The voltage regulator circuitry provides the regulated
voltage for the Analog IC as well as the VDD/VSS rails for the
core IC. The on-chip regulator consists of two elements, the
main regulator, and the low voltage reset circuit. The VDD
regulator accepts an unregulated input supply, and provides
a regulated VDD supply to all digital sections of the device.
The output of the regulator is also connected to the VDD pin,
to provide the 5.0V to the microcontroller.
SWITCHED VDD
This function provides a switchable +5.0V VDD rail for an
external load.
WATCHDOG TIMER
The watchdog timer module generates a reset, in case of
a watchdog timeout or wrong watchdog timer reset. A
watchdog reset event will reset all registers in the SPI,
excluding the RSR.
RESET, IRQ & WAKE-UP
There are several functions on the Analog IC that can
generate a reset or wake-up signal to the core IC. There is a
pin that is used to detect an external wake-up event. The
Reset signal has many possible sources in the Analog IC
circuitry. The IRQ function on the Analog IC, will notify the
core IC of pending system critical conditions.
CONTROL & INTERFACE:
HALL SENSOR INTERFACE
This interface can be configured to support an input pin as
a general purpose input, or as a hall-effect sensor input, to be
able to read 3-pin / 2-pin hall sensors or switches.
908E621
24
Analog Integrated Circuit Device Data
Freescale Semiconductor