A4910_16 Datasheet, PDF (14/36 Pages) Allegro MicroSystems – Automotive 3-Phase MOSFET Driver

A4910
Automotive 3-Phase MOSFET Driver
Logic Truth Tables
Table 1: Mapping of Phase Control Inputs to Internal Phase Control States
Phase Control Inputs
External Control Pins
Run Register
Control Bits
Resultant
Control States
(Inputs for Table 2)
xHI
xH
HIx
0
0
0
0
1
1
1
0
1
1
1
1
xLO
xL
LOx
0
0
0
0
1
1
1
0
1
1
1
1
Table 2: Mapping of Internal Phase Control States to Gate Drive Outputs
Inputs
Output
Override Pin
Control States
(From Table 1)
Gate Drive Outputs
COASTn
HIx
LOx
GHx
GLx
1
0
0
Low
Low
1
0
1
Low
High
1
1
0
High
Low
1
1
1
Low
Low
0
X
X
Low
Low
X = don’t care, Z = high impedance
Sx
Z
Low
High
Z
Z
Comment
Phase disabled
Phase sinking
Phase sourcing
Phase disabled
Phase disabled
All three motor drive phases are controlled independently. Control
states (HIx, LOx) are derived by combining the logic states applied to
the control input pins (xHI, xLO) with the bit patterns held in the Run
register (xH, xL). Normally the input pins or the Run register method
is used for control with the other being held inactive (all pins or bits at
logic 0). Table 1 details how the two control mechanisms are combined
and Table 2 shows the way in which the resultant control states map to
the gate drive outputs.
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14
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Worcester, Massachusetts 01615-0036 U.S.A.
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