L9947S datasheet(10/13 Pages) STMICROELECTRONICS

Part #	L9947S

Description	QUAD HALF-BRIDGE AND SINGLE HIGH-SIDE DRIVER

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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10 / 13 page

Diagnostic (TABLE 2; STATUS 11 - 15):

The diagnostic delivers the information of the out-

put voltage status (high or low) at the outputs

OUT1 - OUT5, overcurrent, overvoltage shutdown

and over temperature. The output voltage detec-

tion is done by hysteresis comparators with

thresholds at 0.4VS and 0.6 VS. The overcurrent

(OVC) information is latched till a new or repeated

write command was received. The OVC1 is set to

high with the overcurrent condition at any of the

half-bridge outputs. OVC2 error bit will be set with

the overcurrent condition at OUT5. The overvol-

tage (OVV) is high till the supply voltage VS ex-

ceeds the overvoltage threshold of 20V typ.

The overtemperature (OT) is high if the junction

temperature is less than typ. 30 Kevin below the

thermal shutdown junction temperature (TJSD).

Detection of Load Interruption

(TABLE 3):

The outputs OUT1 - OUT4 are connected by the

motors in the application. The output OUT4 can

be switched as current source or sink with typ.

140mA current capability (status 16 + 17). The

sum of current consumption is <1mA if the output

current IOUT4 = 0 (status 17). The diagnostic of

the output voltage delivers the information if one

or more of the half bridges is shorted to VS or

GND or the motor connections are interrupted. In

status 18 the outputs OUT1 - OUT3 are switched

as current sinks (typ. 10mA), OUt4 and OUt5 as

current sources (OUT4 140mA, OUT5 10mA).

With this current the influence of leakage currents

and oxidized contacts is eliminated.

Standby (TABLE!; STATUS 2):

The L9947 is set in standby mode with the posi-

tive edge of CSN when all other inputs are low.

All latched data will be cleared and the inputs and

outputs are in tristate.

The total current consumption is less than 100

µA.

CSN=0 quits the standby. All latched data are

cleared.

Clear (TABLE 4: STATUS 20):

If the chip select is low for ore than TCLR = 100

µs,

the internal latched data will be cleared and the

outputs become tristate. Repetitive high low

edges activate the inputs again. Also a broken

CSN-wire activates this clear function due to the

internal pull down resistor at CSN input. After a

clear, the L9947 goes in standby and can be

wake up with a negative edge of CSN.

Thermal Shutdown:

When the junction temperature increases above

TJSD the power DMOS transistors are switched off

until the junction temperature drops below the

value TJSD -TJHYST.

Clamp Current of The Power Outputs:

For output voltages 10V and larger a clamp cur-

rent of appr. 50

µA will flow in the power outputs

due to the internal gate-source voltage limitation,

when the device is not in standby.

Overvoltage Shutdown:

When the supply voltage VS exceeds the overvol-

tage threshold VSQVT, typ. 20V,the outputs OUT1

- OUT5 go in tristate condition. If the supply volt-

age goes under the overvoltage shutdown tre-

shold, the status is the same as before the over-

voltage condition occurred.

Undervoltage:

In the voltage range 2V <VCC < 4V the internal

logic is reseted and all outputs go in tristate. Also

ground spikes on the VCC reset the logic. After

an internal reset of the logic, the L9947 is control-

led again by the inputs.

Ground Interrupt:

The L9947 is protected against interruption. The

output OUt5 switches off at ground interruption.

The outputs OUT1 - OUt4 are driven in full bridge

configuration as shown in the application. There

is no path through the load or direct to another

ground. Thus, the device protected.

VCC Interruption

If the supply voltage VS is present and VCC is in-

terrupted or not supplied, than two cases can be

distinguished:

1 The data pins D0 - D3 are not driven by the

µC or they are low. So the outputs OUT1 -

OUT5 and D0 - D3 are in tristate.

2 One of the pins D0 - D3 is driven high the

µC. This pin supplies the VCC pin by the

drain-bulk-diode of the p-channel mos (fig.5).

Depending of the CSN, R/WN and MODE in-

puts some undesiderable functions can occur.

L9947

10/13

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