ATA6834-DK Atmel, ATA6834-DK Datasheet - Page 5

• Manufacturer Part Number: ATA6834-DK
• Description: BOARD BLDC MOTOR CTRL ATA6833/34
• Manufacturer: Atmel
• Type: MOSFET & Power Driverr

Specifications of ATA6834-DK

• Main Purpose: Power Management, Motor Control
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: ATA6833 / ATA6834, ATmega32M1
• Primary Attributes: 3-Ph BLDC, IC with FET Driver, LIN Transceiver, Volt Regulator, Watchdog
• Secondary Attributes: LCD with Touch Screen on MCU Controller Board
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3. Functional Description
3.1
3.1.1
3.1.2
3.1.3
3.1.4
9122G–AUTO–10/10
Power Supply Unit with Supervisor Functions
Power Supply
VBatt Switch
Voltage Supervisor
Temperature Supervisor
The IC has to be supplied by a reverse-protected battery voltage. To prevent damage to the
IC, proper external protection circuitry has to be added. It is recommended to use at least one
capacitor combination of storage and RF capacitors behind the reverse protection circuitry,
which is connected close to the VBAT and GND pins of the IC.
A fully integrated low-power and low-drop regulator (VINT regulator), stabilized by an external
blocking capacitor, provides the necessary low-voltage supply needed for the wake-up pro-
cess. A trimmed low-power band gap is used as reference for the VINT regulator as well as for
the VCC regulator. All internal blocks are supplied by VINT regulator. VINT regulator must not
be used for any external supply purposes.
Nothing inside the IC except the logic interface to the external microcontroller is supplied by
the 5V/3.3V VCC regulator.
Both voltage regulators are checked by a “power-good comparator”, which keeps the whole
chip in reset as long as the internal supply voltage (VINT regulator output) is too low and gen-
erates a reset for the external microcontroller if the output voltage of the VCC regulator is not
sufficient.
This high-voltage switch provides the battery voltage at pin VBATSW for various purposes. It
is switched ON after power on reset when the IC transits to Active Mode and it will only turn
OFF when the IC changes to Sleep Mode. Watchdog resets do not have an effect on the
switch. The switch can be used for measuring purposes as well as to switch on external volt-
age regulators.
This function is implemented to protect the IC and the external power MOS transistors from
damage due to overvoltage on PBAT input. In the event of overvoltage (V
age (V
will be flagged on DG2 pin. It is recommended to block PBAT with an external RF capacitor to
suppress high frequency disturbances.
An integrated temperature sensor prevents the IC from overheating. If the temperature is
above the overtemperature pre-warning threshold T
switched to HIGH to signal this event to the external microcontroller. The microcontroller
should take actions to reduce the power dissipation in the IC. If the temperature rises above
the overtemperature shutdown threshold T
together with the LIN transceiver will be switched OFF immediately and the /RESET signal will
go LOW. Both thresholds have a built-in hysteresis to avoid oscillations. The IC will return to
normal operation (Active Mode) when it has cooled down below the shutdown threshold.
When the junction temperature drops below the pre-warning threshold, bit DG3 will be
switched LOW.
THUV
), the external NMOS motor driver transistors will be switched off. The failure state
Atmel ATA6833/ATA6834 [Preliminary]
J switch off
, the VCC regulator and all output drivers
JPW set
, the diagnostic pin DG3 will be
THOV
) or undervolt-
5