MC33389DDW Freescale, MC33389DDW Datasheet - Page 18

• Manufacturer Part Number: MC33389DDW
• Manufacturer: Freescale

Specifications of MC33389DDW

• Number Of Transceivers: 1
• Power Down Mode: Sleep/Standby
• Operating Supply Voltage (max): 27V
• Operating Supply Voltage (typ): 9/12/15/18/24V
• Operating Supply Voltage (min): 5.5V
• Package Type: SOIC W
• Supply Current: 7mA
• Operating Temperature (max): 125C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Not Compliant

Voltage Regulator V1
dedicated to the microcontroller supply. It can deliver up to
100 mA. It is totally protected against short-to-ground
(current limitation) and over temperature. V1 is active in
Normal Request, Normal, and Stand-by modes.
means if V
from V1 to V
V1. Its stored energy will only be used to supply the
microcontroller and gives time to save all relevant data.
• Under Voltage Reset—V1 is monitored for under voltage
• Over Temperature Protection—V1 internal ballast
threshold, V1 regulator will be automatically switched ON.
Table 6. V1 Control
management. Over temperature shutdown might be reached and
lead to turn OFF of V1, V2, and V3 for output current below their
maximum current capability.
18
Note: Current capability of V1, V2 and V3 depends upon the thermal
33389
FUNCTIONAL DEVICE OPERATION
Normal Request Mode
(at V1 Power ON)
Normal Mode (via SPI)
Stand-by Mode (via SPI)
V1 Below Pre-Warning
Temperature Threshold
During Rest
No forward parasitic diode exists from V1 to V
(power-up, power down) and a reset is provided at RST
output for 1 ms. This ensures proper initialization of the
microcontroller at power-on or after supply is lost.
Furthermore, a flag is set in the Reset Source Register
(RSR) and can be read via the SPI.
transistor is monitored for over temperature. 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 Over Temperature Status
Register (OTSR). A maskable interrupt can be sent to the
microcontroller. Once the second threshold is reached, a
flag is set in the OTSR, a maskable interrupt is sent to the
microcontroller and V1 is switched OFF.
Once the junction temperature is back to the pre-warning
V1 is a 5.0 V, three percent low drop voltage regulator
Conditions for V1 ON
BAT
BAT
voltage drops below V1, high current flowing
will not discharge the capacitor connected to
Shut-Off Temperature Threshold
Conditions for V1 OFF
No V
Sleep Mode (via SPI)
FUNCTIONAL DEVICE OPERATION
Emergency Mode
BAT
(cold start)
Reached
Power Supply
—
BAT
. This
Voltage Regulator V2
peripherals supply. It can deliver up to 200 mA and is
protected against short to ground (current limitation) and over
temperature. V2 is active in Normal mode.
• Under Voltage Detection—V2 is monitored for under
• Over Temperature Protection—V2 internal ballast
OTSR register, V2 is switched OFF. It can only be switched
on again via the SPI.
Table 7. V2 Control
Switch V3
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).
• Over Temperature Protection—V3 output transistor is
Table 8. V3 Control
Permanently in Normal Mode
Normal Mode (via SPI) and V2
Below Shut-Off Temperature
Threshold
—
—
Mode if Configured via SPI
Permanently in Stand-by
V2 is a 5.0 V low drop voltage regulator dedicated to
voltage and a flag is set in the Voltage Supply Status
Register (VSSR).
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 readable OTSR register. A
maskable interrupt can be sent to microcontroller.
Once the second threshold is reached, a flag is set in the
V3 is a 10 Ω switch to V
monitored for over temperature. 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.
Conditions For V3 ON
In Sleep Mode, During
Enable Time of Cyclic
if Configured via SPI
Sense if Configured
Conditions for V2 ON
—
Analog Integrated Circuit Device Data
BAT
. It can be used to supply
Shut-Off Temperature Threshold
Request, or Emergency Modes
V1 Disabled (for any reason)
Conditions For V3 OFF
Permanently in Stand-by
Permanently in Normal
Normal Request Mode
Permanently in Sleep
Sleep, Stand-by, Normal
Conditions for V2 OFF
Freescale Semiconductor
Mode if Configured
Mode if Configured
Mode if Configured
Reached
(via SPI)