Analog Integrated Circuit Device Data
22
Freescale Semiconductor
908E621
FUNCTIONAL DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
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 5.0 V to the microcontroller.
SWITCHED VDD
This function provides a switchable +5.0 V 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.
MM908E621 - Functional Block Diagram
Internal Regulators & Safety
Outputs
Control & Interface
MC68HC908EY16 Core
SMARTMOS Analog Control IC
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
Reset & IRQ
Analog Multiplexer
Voltage Regulation
Reset, IRQ & Wake-up
Switched VDD
Watchdog Timer
Internal Regulators & Safety
Control & Interface
Outputs
High Side Drivers & Diagnostics
H-Bridge Drivers & Diagnostics
Hall Sensor Interface
MC68HC908EY16 Core
Timer Modules
Communication Modules
LIN Interface
Analog Input w/Integrated Current Source
SPI Interface & PWM Control