ATA6824-PNQW Atmel, ATA6824-PNQW Datasheet - Page 6

• Manufacturer Part Number: ATA6824-PNQW
• Description: IC H-BRIDGE MOTOR DRIVER
• Manufacturer: Atmel

Specifications of ATA6824-PNQW

• Applications: DC Motor Controller
• Number Of Outputs: 1
• Voltage - Supply: 6.5 V ~ 21.3 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.1.2
5.1.3
5.2
6
5V/3.3V VCC Regulator
Atmel ATA6824
Voltage Supervisor
Temperature Supervisor
This block is intended to protect the IC and the external power MOS transistors against over-
voltage on battery level and to manage undervoltage on it.
Function: in case of both overvoltage alarm (V
external NMOS motor bridge transistors will be switched off. The failure state will be flagged
via DG2. No other actions will be carried out. The voltage supervision block is connected to
VBAT and filtered by a first-order low pass with a corner frequency of typical 15kHz.
There is a temperature sensor integrated on-chip to prevent the IC from overheating due to a
failure in the external circuitry and to protect the external NMOSFET transistors.
In case of detected overtemperature (180°C), the diagnostic pin DG3 will be switched to “H” to
signalize overtemperature warning to the microcontroller. It should undertake actions to
reduce the power dissipation in the IC. In case of detected overtemperature (200°C), the V
regulator and all drivers including the serial interface will be switched OFF immediately and
/RESET will go LOW.
Both temperature thresholds are correlated. The absolute tolerance is ±15K and there is a
built-in hysteresis of about 10K to avoid fast oscillations. After cooling down below the 170°C
threshold; the IC will go into Active mode.
The occurrence of overtemperature shutdown is latched in DG3. DG3 stays on high until first
WD trigger.
The 5V/3.3V regulator is fully integrated on-chip. It requires only a 2.2µF ceramic capacitor for
stability and has 100mA current capability. Using the VMODE pin, the output voltage can be
selected to either 5V or 3.3V. Switching of the output voltage during operation is not intended
to be supported. The VMODE pin must be hard-wired to either VINT for 5V or to GND for 3.3V.
The logic HIGH level of the microcontroller interface will be adapted to the VCC regulator
voltage.
The output voltage accuracy is in general < ±3%; in the 5V mode with V
< 5%.
To prevent destruction of the IC, the current delivered by the regulator is limited to maximum
100mA to 350mA. The delivered voltage will break down and a reset may occur.
Please note that this regulator is the main heat source on the chip. The maximum output cur-
rent at maximum battery voltage and high ambient temperature can only guaranteed if the IC
is mounted on an efficient heat sink.
A power-good comparator checks the output voltage of the VCC regulator and keeps the
external microcontroller in reset as long as the voltage is too low.
THOV
) and of undervoltage alarm (V
VBAT
< 9V it is limited to
4931L–AUTO–02/11
THUV
) the
CC