MM908E624ACEWSLASHR2 datasheet(19/40 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

908E624

FUNCTIONAL DESCRIPTION

FUNCTIONAL TERMINAL DESCRIPTION

MCU POWER SUPPLY TERMINALS

(EVDD AND EVSS)

EVDD and EVSS are the power supply and ground

terminals, respectively. The MCU operates from a single-

power supply.

Fast signal transitions on MCU terminals place high, short-

duration current demands on the power supply. To prevent

noise problems, take special care to provide power supply

bypassing at the MCU.

For details, refer to the 68HC908EY16 data sheet.

ADC SUPPLY TERMINALS (VDDA AND VSSA)

VDDA and VSSA are the power supply terminals for the

analog-to-digital converter (ADC). It is recommended that a

high-quality ceramic decoupling capacitor be placed between

these terminals.

Important

VDDA is the supply for the ADC and should be

tied to the same potential as EVDD via separate traces.

VSSA is the ground terminal for the ADC and should be tied

to the same potential as EVSS via separate traces.

For details, refer to the 68HC908EY16 data sheet.

ADC REFERENCE TERMINALS

(VREFL AND VREFH)

VREFL and VREFH are the reference voltage terminals for

the ADC. It is recommended that a high-quality ceramic

decoupling capacitor be placed between these terminals.

Important

VREFH is the high reference supply for the

ADC and should be tied to the same potential as VDDA via

separate traces. VREFL is the low reference supply for the

ADC and should be tied to the same potential as VSSA via

separate traces.

For details, refer to the 68HC908EY16 data sheet.

TEST TERMINAL (FLSVPP)

This terminal is for test purposes only. Do not connect in

the application or connect to GND.

PWMIN TERMINAL (PWMIN)

This terminal is the direct PWM input for high side

outputs 1 and 2 (HS1 and HS2). If no PWM control is

required, PWMIN must be connected to VDD to enable the

HS1 and HS2 outputs.

LIN TRANSCEIVER OUTPUT TERMINAL (RXD)

This terminal is the output of LIN transceiver. The terminal

must be connected to the microcontroller’s Enhanced Serial

Communications Interface (ESCI) module (RXD terminal).

RESET TERMINAL (RST_A)

RST_A

is the reset output terminal of the analog die and

must be connected to the RST terminal of the MCU.

Important

To ensure proper operation, do not add any

external pullup resistor.

INTERRUPT TERMINAL (IRQ_A)

IRQ_A

is the interrupt output terminal of the analog die

indicating errors or wake-up events. This terminal must be

connected to the IRQ terminal of the MCU.

WINDOW WATCHDOG CONFIGURATION

TERMINAL (WDCONF)

This terminal is the configuration terminal for the internal

watchdog. A resistor is connected to this terminal. The

resistor value defines the watchdog period. If the terminal is

open, the watchdog period is fixed to its default value.

The watchdog can be disabled (e.g., for flash

programming or software debugging) by connecting this

terminal to GND.

POWER SUPPLY TERMINALS

(VSUP1 AND VSUP2)

This VSUP1 power supply terminal supplies the voltage

regulator, the internal logic, and LIN transceiver.

This VSUP2 power supply terminal is the positive supply

for the high side switches.

POWER GROUND TERMINAL (GND)

This terminal is the device ground connection.

HIGH SIDE OUTPUT TERMINALS (HS1 AND HS2)

These terminals are high side switch outputs to drive loads

such as relays or lamps. Each switch is protected with over-

temperature and current limit (over-current). The output has

an internal clamp circuitry for inductive load. The HS1 and

HS2 outputs are controlled by SPI and have a direct enabled

input (PWMIN) for PWM capability.

HIGH SIDE OUTPUT TERMINAL (HS3)

This high side switch can be used to drive small lamps,

Hall-effect sensors, or switch pullup resistors. The switch is

protected with over-temperature and current limit (over-

current). The output is controlled only by SPI.

LIN BUS TERMINAL (LIN)

The LIN terminal represents the single-wire bus

transmitter and receiver. It is suited for automotive bus

systems and is based on the LIN bus specification.

WAKE-UP TERMINALS (L1 AND L2)

These terminals are high-voltage capable inputs used to

sense external switches and to wake up the device from

Sleep or Stop mode. During Normal mode the state of these

terminals can be read through SPI.

Important

If unused these terminals should be connected

to VSUP or GND to avoid parasitic transitions. In Low Power

Mode this could lead to random wakeup events.

MM908E624ACEW/R2 Datasheet(PDF) 19 Page - Freescale Semiconductor, Inc

MM908E624ACEW/R2 Datasheet(HTML) 19 Page - Freescale Semiconductor, Inc

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