L99UDL01 datasheet(80/88 Pages) STMICROELECTRONICS

80 / 88 page

Programmers guide

L99UDL01

80/88

DS12511 Rev 5

At turn on, there is an additional programmable VDS fault blanking time (EXTx_VDtx). In

this case, starting from a turn on command, the delay includes the VDS fault filter time plus

the programmed blanking time (i.e. tVDS_FILTER + EXTx_VDtx).

DOSx / DOS_EXTx

The Dynamic output state bits provide the state of the output either above or below a

threshold (VOUT_th). The outputs are examined at the falling edge of CSN. If the output is

above VOUT_th the bit is set. If the output is below VOUT_th the bit is reset. This is a dynamic

condition. If the output is being PWMmed then the bit may be set or reset depending on

when during the PWM duty cycle the CSN pin went low.

The advantage of this feedback is for off-state diagnosis in conjunction with the weak pull-

up/down currents. Between these two features the quality of the load (short to battery, short

to ground, open circuit) can be determined before an output is enabled.

STATx

The device status bits tell of the actuation status of the device. There are 4 states. These

only apply to outputs being controlled by the state machine and not being overridden

(Output Override). Overridden outputs are not considered with respect to the status bits.



Ready: The device is in inactive state ready for use



Actuating: The device is in the process of actuation but has not entered Braking mode



Braking: The device has finished actuating and is now braking.



Complete: The device has completed actuation and braking modes. Status bits remain

at “Complete” until a read and clear command is sent and status is reset to Ready. It

should be noted that when the indefinite braking duration is selected (tOFF_x=[1;1]) the

“Complete” status will appear 100 ms after dynamic braking has started.

Table 55. EXT output status register

Output diagnostic

EXTFx_1

EXTFx_0

Diagnostic

No Fault

LSD VDS Fault

HSD VDS Fault

Not used

Table 56. Device status bits

Status bits

STAT1

STAT0

Mode

Ready

Actuating

Braking

Complete

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