MC33989PEG Freescale Semiconductor, MC33989PEG Datasheet - Page 20

• Manufacturer Part Number: MC33989PEG
• Description: SBC-HS
• Manufacturer: Freescale Semiconductor

FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
DEVICE SUPPLY
transients and reverse battery. It can operate from 4.5 V and under the jump start condition at 27 Vdc. This pin sustains standard
automotive voltage conditions such as load dump at 40 V. When V
the information into the SPI register in a bit called BATFAIL. This detection is available in all operation modes.
V typical. A hysteresis is included. Operation is only in Normal and Standby modes. V
Register (IOR).
VDD1 VOLTAGE REGULATOR
circuitry associated with a reset function. The VDD1 regulator is fully protected against over-current and short-circuit. It has over-
temperature detection warning flags (bit V
hysteresis.
V2 REGULATOR
to achieve the flexibility. Those pins are V2 and V2 control. The output voltage is 5.0 V and is realized by a tracking function of
the VDD1 regulator. The recommended ballast transistor is MJD32C. Other transistors can be used; however, depending upon
the PNP gain an external resistor-capacitor network might be connected. The V2 is the supply input for the CAN cell. The state
of V2 is reported in the IOR (bit V2LOW set to 1 if V2 is below 4.5 V typical).
HS1 VBAT SWITCH OUTPUT
up or pull-down circuitry, in conjunction with the wake-up input pins, for example. Output current is limited to 200 mA and HS1 is
protected against short-circuit and has an over-temperature shutdown (bit HS1OT in IOR and bit HS1OT-V2LOW in INT register).
The HS1 output is controlled from the internal register and the SPI. Because of an internal timer, it can be activated at regular
intervals in Sleep and Stop modes. It can also be permanently turned on in Normal or Standby modes to drive loads or supply
peripheral components. No internal clamping protection circuit is implemented, thus a dedicated external protection circuit is
required in case of inductive load drive.
BATTERY FALL EARLY WARNING
INTERNAL CLOCK
oscillators are implemented. A high accuracy (±12 percent) used in Normal Request, Normal and Standby modes, and a low
accuracy (±30 percent) used in Sleep and Stop modes.
FUNCTIONAL MODES
by the device after reset or wake-up from Stop mode. A Reset (RST) mode is also implemented. Special modes and configuration
are possible for debug and program MCU flash memory.
20
33989
1. Standby mode
2. Normal mode
3. Stop mode
4. Sleep mode
The device is supplied from the battery line through the VSUP pin. An external diode is required to protect against negative
The device incorporates a battery early warning function, providing a maskable interrupt when the V
The VDD1 Regulator is a 5.0 V output voltage with output current capability up to 200 mA. It includes a voltage monitoring
V2 Regulator circuitry is designed to drive an external path transistor increasing output current flexibility. Two pins are used
The HS1 output is a 2.0 Ω typical switch from the VSUP pin. It allows the supply of external switches and their associated pull-
Refer to the discussion under the heading: Device Supply.
The device has an internal clock used to generate all timings (Reset, Watchdog, Cyclic Wake-up, Filtering Time, etc.). Two
The device has four primary operation modes:
All modes are controlled by the SPI. An additional temporary mode called Normal Request mode is automatically accessed
FUNCTIONAL DEVICE OPERATION
DDTEMP
OPERATIONAL MODES
in MCR and interrupt registers), and over-temperature shutdown with
SUP
falls below 3.0 V typical the 33989 detects it and stores
SUP
Analog Integrated Circuit Device Data
low is reported in the Input/Output
Freescale Semiconductor
SUP
voltage is below 6.0