L9947S Ver la hoja de datos (PDF) - STMicroelectronics

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L9947S

QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER

STMicroelectronics 

L9947

DATA TRANSFER AND OUTPUTS ACTIVAT- the half bridges are in tristate status 10.

ING (Figure 3)

The µC works always as master and the L9947

The half bridges of OUT1, OUT2 and OUT3 can Power Interface as slave. That means: the µC

be used with OUT4 to drive three bidirectional starts the communication between the Power In-

motors in full bridge configuration as shown in terface and itself with low transition at the CSN

fig.1 Only one motor can be driven in the same line. CSN = 0, R/WN= 0 the L9947 reads the data

time. The µC writes the corresponding word at the bus and execute the command as shown in

status 1 till 10 at the bus and latch it with a low tables 1,3,4 (write mode). The high slope of the

pulse in the L9947. So the motor is activated. To CSN stores the last command and execute it fur-

stop the motor it is useful to insert a braking ther. All inputs are disabled if CSN= 1.

phase (status 9). In the braking condition there So the bus can be used for another device. With

are all low side DMOS of the half bridges CSN = 0 and R/WN = 1 the L9947 writes the

switched-on in this case the flyback currents flows status of the diagnostic at the parallel bus until

through the low side switches instead of the intrin- CSN becomes high (table 2; status µ + 15) (read

sic diodes of the half bridges. After that, the half

bridges could be switched in tristate (T). The high

) side driver, OUT5 can be switched only when all

mode). The power outputs maintain the same

status as before.

t(s Figure 3: Signal sequence for data transfer to switch M1 right, read the output status, brake the motor

OObbssoolleettee PPrroodduucctt((ss)) -- OObbssoolleettee PPrroodduucct(s) and activate the standby mode.

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