ATA6026 ATMEL Corporation, ATA6026 Datasheet - Page 14

• Manufacturer Part Number: ATA6026
• Description: H-bridge Motor Driver
• Manufacturer: ATMEL Corporation

3.8
3.8.1
14
Diagnosis
ATA6026
Overvoltage
Table 3-3.
Note:
This block protects the IC and the external power MOS transistors against overvoltage on the
battery.
Function: In the case of overvoltage alarm (V
switched off, and the event will be signalled by switching the pin DG2 ON (see
overvoltage condition disappears, after the next LOW to HIGH transition at pin PWM, the drivers
for the external power MOS transistors will switch back to the status defined by the control pin
DIR and the pin DG2 will be cleared to LOW if there is no other event to be signalled. The SCI
drivers are not influenced by the voltage supervisor. The comparator includes a hysteresis.
Event
UV
Release UV
OV
Release OV
SC
Release SC
TS
Release TS
After power-on, the undervoltage status may be latched. To switch the drivers ON, a LOW to HIGH
transition at PWM is required.
Undervoltage
(V
V
above V
Overvoltage
(V
V
above V
Short circuit (if
source-drain voltage
of switched external
NMOS is > 4V, short
circuit is detected)
Short circuit condition
disappears
Thermal shutdown
(junction temperature
> 165
Thermal shutdown
(junction temperature
< 165
Table of Events Detected by the ATA6026
Description
BAT
BAT
BAT
BAT
increasing
increasing
< V
> V
o
o
C ±hysteresis)
C ±hysteresis)
THUV
THOV
THUV
THOV
)
)
DG1 DG2 Additional reaction of ATA6026
1
0
0
0
1
0
1
0
0
0
1
0
1
0
1
0
Switch OFF L1, L2, H1, H2
Switch ON L1, L2, H1, H2
according to PWM/DIR status
Switch OFF L1, L2, H1, H2
Switch ON L1, L2, H1, H2
according to PWM/DIR status
Switch OFF L1, L2, H1, H2
Switch ON L1, L2, H1, H2
according to PWM/DIR status
Switch OFF L1, L2, H1, H2, DATA,
/DATA
Switch ON L1, L2, H1, H2,
according to PWM/DIR status
Switch ON DATA, /DATA according
to Tx status
THOV
), the external NMOS transistors will be
Table
Timing
16 µs to 35 µs
after detection
After LOW to
HIGH transition
at PWM
16 µs to 35 µs
after detection
After LOW to
HIGH transition
at PWM
5 µs to 15 µs
after detection
After LOW to
HIGH transition
at PWM
Directly after
detection
After LOW to
HIGH transition
at PWM
Directly after
detection
4865C–AUTO–01/06
3-3). If the