L9904(2002) データシートの表示（PDF） - STMicroelectronics
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L9904 Datasheet PDF : 17 Pages
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L9904
FUNCTIONAL DESCRIPTION (continued)
Control inputs (EN, DIR, PWM)
The cmos level inputs drive the device as shown in fig.4 and described in the truth table.
The device is activated with enable input HIGH signal. For enable input floating (not connected) or VEN=0V the
device is in standby mode. When activating the device a wake-up time of 50µs is recommended to stabilize the
internal supplies.
The DIR and PWM inputs control the driver of the external H-Bridge transistors. The motor direction can be
choosen with the DIR input, the duty cycle and frequency with the PWM input. Unconnected inputs are defined
by internal pull up resistors. During wake-up and braking and before disactivating the IC via enable both inputs
should be driven HIGH.
Truth table:
Status Control inputs
Device status
Driver stage for external
power MOS
Diagnostic
Comment
EN DIR PWM TS OV UV SC GH1 GL1 GH2 GL2
DG
1
0
x
x
x
x
x
x
R
RRR
T
standby mode
2
1
x
x
1
0
0
0
L
L
L
L
L
thermal
shutdown
3
1
x
x
0
1
0
0
L
L
L
L
L
overvoltage
4
1
x
x
0
0
1
0
L
L
L
L
L
undervoltage
5
1
x
x
0
0
0
1
X6) X6) X6) X6
L
short circuit 6)
6
1
0
0
0
0
0
0
L
HH
L
H
7
1
x
1
0
0
0
0
L
H
L
H
H
braking mode
8
1
1
0
0
0
0
0
H
L
L
H
H
Symbols: x Don't care
R:Resistive output
TS:Thermal shutdown
0: Logic LOW or not active L: Output in sink condition
OV:Overvoltage
1: Logic HIGH or active
H: Output in source condition
UV:Undervoltage
T: Tristate
SC:Short Circuit
6. Only those external MOS transistors of the H-Bridge which are in short circuit condition are switched off. All others remain driven
by DIR and PWM.
Thermal shutdown
When the junction temperature exceeds TJSD all driver are switched in sink condition (L), the K- output is off and
the diagnostic DG is LOW until the junction temperature drops below TJSD - TJHYST.
Overvoltage Shutdown
When the supply voltage VVS exceeds the overvoltage threshold VVSOVH all driver are switched in sink condi-
tion (L), the K- output is off and the diagnostic DG is LOW.
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