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HT66FM5440
Brushless DC Motor A/D Flash MCU
HT66FM5440
Brushless DC Motor A/D Flash MCU
Staggered Function
The Staggered Function is used to force all output drive transistors to an off condition when a
software error occurs or due to external factors such as ESD.
AT1
AB1
AT2
AB2
0
0
0
0
0
1
0
1
1
0
1
0
1
1
0
0
Note: The default condition for the BLDC motor control circuit is designed for default N-type transistor
pairs. This means a "1" value will switch the transistor on and a "0" value will switch it off.
Polarity Control Function
This function allows setup of the external gate drive transistor On/Off polarity status. A single
register, PLC, is used for overall control.
• PLC Register
Bit
7
6
5
4
3
2
1
0
Name
—
—
PCBC
PCTC
PBBC
PBTC
PABC
PATC
R/W
—
—
R/W
R/W
R/W
R/W
R/W
R/W
POR
—
—
0
0
0
0
0
0
Bit 7~6
Unimplemented, read as "0"
Bit 5
PCBC
: C pair Bottom port gate output control
0: Non-inverse output
1: Inverse output
Bit 4
PCTC
: C pair Top port gate output control
0: Non-inverse output
1: Inverse output
Bit 3
PBBC
: B pair Bottom port gate output control
0: Non-inverse output
1: Inverse output
Bit 2
PBTC
: B pair Top port gate output control
0: Non-inverse output
1: Inverse output
Bit 1
PABC
: A pair Bottom port gate output control
0: Non-inverse output
1: Inverse output
Bit 0
PATC
: A pair Top port gate output control
0: Non-inverse output
1: Inverse output
Note that the GAT/GAB/GBT/GBB/GCT/GCB pin default output status is high impedence.