MC33389 datasheet(11/35 Pages) MOTOROLA

tên linh kiện	MC33389

Giải thích chi tiết về linh kiện	System Basis Chip with Low Speed Fault Tolerant CAN

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MC33389

MOTOROLA

11

MC33389

DEVICE DESCRIPTION

Introduction

The System Basis Chip is an integrated circuit dedicated

to car body applications. It includes three main blocks :

- A dual voltage regulator

- Reset, watchdog, wake up inputs, cyclic wake up

- CAN low speed fault tolerant physical interface

Supplies

Two low drop regulators and one switch to Vbat are

provided to supply the ECU microcontroller or peripherals,

with independent control and monitoring through SPI.

Voltage Regulator V1

V1 is a 5V, 3% low drop voltage regulator dedicated to the

microcontroller supply. It can deliver up to 100mA and is

totally protected against short to ground (current limitation)

and overtemperature. V1 is active in Normal request, Normal

and standby modes.

No forward parasitic diode exists from V1 to Vbat. This

means that, if Vbat voltage drops below V1, no high current

flowing from V1 to Vbat will discharge the capacitor connected

to V1. Its stored energy will only be used to supply the

microcontroller and gives time to save all relevant data.

Undervoltage Reset

V1 is monitored for undervoltage (power up, power down)

and a reset is provided at RSTB output for 1ms. This ensures

proper initialization of the microcontroller at power-on or after

supply is lost. On top of that, a flag is set in RSR register

readable via the SPI.

Overtemperature Protection

V1

internal

ballast

transistor

is

monitored

for

overtemperature. Two detection thresholds are provided. A

pre-warning threshold at 145°C and a shut-off threshold at

175°C. Once the first threshold is reached, a flag is set in the

OTSR register. A maskable interrupt can be sent to the

microcontroller. Once the second threshold is reached, a flag

is set in the OTSR register, a maskable interrupt is sent to the

microcontroller and V1 is switched off.

Once the junction temperature is back to the pre-warning

threshold, V1 regulator it will be automatically switched on.

Table 4. V1 Control

Note: current capability of V1, V2 and V3 depends upon

the thermal management. Over temperature shutdown might

be reached and lead to turn off of V1, V2 and V3 for output

current below their max current capability.

Voltage Regulator V2

V2 is a 5V low drop voltage regulator dedicated to

peripherals supply. It can deliver up to 200mA and is protected

Conditions For V1 On

Conditions For V1 Off

NormalRequest mode

(at V1 power on)

Sleep mode (via SPI)

Normal mode (via SPI)

Shut-off temperature

threshold reached

Standby mode

(via SPI)

No Vbat power supply

(cold start)

V1 below pre-warning

temperature threshold

Emergency mode

During Reset

against short to ground (current limitation) and overtemperature.

V2 is active in Normal mode.

Undervoltage Detection

V2 is monitored for undervoltage and a flag is set in the

VSSR register.

Overtemperature Protection

V2

internal

ballast

transistor

is

monitored

for

overtemperature. Two detection thresholds are provided. A

pre-warning threshold at 140°C and a shut-off threshold at

165°C. Once the first threshold is reached, a flag is set in the

OTSR register which is readable. A maskable interrupt can be

sent to microcontroller.

Once the second threshold is reached, a flag is set in the

OTSR register, V2 is switched off. It can only be switched on

again via the SPI.

Table 5. V2 Control

Switch V3

V3 is a 10

Ω switch to Vbat, it can be used to supply

external contacts or relays. A great flexibility is given for the

different possible ways for its control. It is protected against

short to ground (current limitation).

Overtemperature Protection

V3 output transistor is monitored for overtemperature.

Once the threshold is reached, a flag is set in the VSSR

register, V3 is switched off. It will be automatically switched on

once the junction temperature is back to the pre-warning

threshold.

Table 6. V3 Control

Supply and Vbat Block

Vbat Monitoring

Vbat is the main power supply coming from the Battery

voltage after an external protection diode (for reverse battery).

Conditions For V2 On

Conditions For V2 Off

Normal mode (via SPI) AND

V2 below shut off

temperature threshold

Sleep mode, or standby

mode or NormalRequest or

emergency mode (via SPI)

Shut-off temp.

threshold reached

V1 disabled

(for any reason)

Conditions For V3 On

Conditions For V3 Off

Permanently in Normal

mode if configured via SPI

Permanently in Normal

mode if configured

Permanently in Standby

mode if configured via SPI

NormalRequest mode

In sleep mode, during

enable time of cyclic

sense if configured

Permanently in Standby

mode if configured

Permanently in sleep

mode if configured

In sleep mode, during

disable time of cyclic

sense if configured

Overtemp threshold reached

V1 disabled (for any reason)

V2 over temperature shutdown

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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