ATA6824 ATMEL Corporation, ATA6824 Datasheet - Page 10

• Manufacturer Part Number: ATA6824
• Description: High Temperature H-bridge Motor Driver
• Manufacturer: ATMEL Corporation

5.5
5.5.1
5.5.2
10
Control Inputs DIR and PWM
ATA6824 [Preliminary]
Pin DIR
Pin PWM
Logical input to control the direction of the external motor to be controlled by the IC. An internal
pull-down resistor is included.
Logical input for PWM information delivered by external microcontroller. Duty cycle and fre-
quency at this pin are passed through to the H-bridge. An internal pull-down resistor is included.
Table 5-1.
The internal signal ON is high when
In case of a short circuit, the appropriate transistor is switched off after a debounce time of about
10 µs. In order to avoid cross current through the bridge, a cross conduction timer is imple-
mented. Its time constant is programmable by means of an RC combination.
Table 5-2.
Note:
• At least one valid trigger has been accepted (SYNC = 1)
• V
• The charge pump has reached its minimum voltage (CPOK = 1) and
• The device is not overheated (OT2 = 0)
CPOK
ON
0
1
1
X
X
X
X
0
BAT
Control Inputs
is inside the specified range (UV = 0 and nOV = 1)
DIR
OT1: Overtemperature warning
OV: Overvoltage of VBAT
UV: Undervoltage of VBAT
SC: Short circuit
CPOK: Charge pump OK
X represents: don't care – no effect)
X
0
1
OT1
X
1
X
X
X
Device Status
Status of the IC Depending on Control Inputs and Detected Failures
Status of the Diagnostic Outputs
PWM
PWM
PWM
OV
X
X
X
X
1
X
UV
X
X
X
X
1
Driver Stage for External Power MOS
/PWM
OFF
ON
H1
SC
X
X
X
X
1
PWM
OFF
OFF
L1
DG1
–
–
–
–
1
Diagnostic Outputs
/PWM
OFF
ON
DG2
H2
1
–
1
1
–
PWM
OFF
OFF
DG3
L2
–
1
–
–
–
Overtemperature warning
Motor PWM forward
Motor PWM reverse
Charge pump failure
Standby mode
Undervoltage
Comments
Overvoltage
Short circuit
Comments
4931C–AUTO–09/06