L99UDL01 datasheet(26/88 Pages) STMICROELECTRONICS

26 / 88 page

Device description

L99UDL01

26/88

DS12511 Rev 5

2.6.2

Thermal protection

There is a thermal sensor associated with each of the internal half bridges. There are two

reported thermal thresholds. These are thermal warning, TWx, and thermal shutdown, TSDx.

Thermal warning only provides a SPI register indication of the condition (TWx). Thermal

shutdown either shuts down the offending half bridge or disables the entire device. This

option is programmable via SPI command. Thermal shutdown is indicated in the SPI

If more than one driver is linked in parallel the hottest driver will cause a thermal indication

(TWx or TSDx). All linked drivers have their diagnostic bits linked as well. That is, they will all

demonstrate the same diagnostic state.

Drivers cannot be activated until its corresponding temperature is below thermal shutdown

threshold and corresponding fault register bit is cleared.

2.6.3

Off state load detection

Along with the standard shorted load and thermal protections the L99UDL01 has the ability

to verify load integrity without actuating loads.

This is done by incorporating enable-able weak pull-up (ODCHx) / pull-down (ODCLx)

currents at each output. By using the weak pull-up/pull-down currents the following

conditions can be determined:



Shorted output to either ground or supply



Open load

One method would be to first bias a motor node by either a weak pull-up or weak pull-down

current then reading the Dynamic Output State (DOSx, DOS_EXTx) bits. A weak pull-up on

one output should cause all nodes associated with that output to pull high. A weak pull-down

on one output should cause all nodes associated with that output to pull low. An open circuit

or shorted output would prevent either one or the other from happening.

2.6.4

Enable-able weak pull-up/down currents

The weak pull-up/pull-down currents are enable-able through SPI command (register 06H

and 07H). Each output can have enabled a weak pull up current or a weak pull down current

individually.

Activating a weak pull-up on one of a paralleled output and a weak pull-down in another of

the same parallel group will be ignored and set a WRT_fail bit. Alternatively, activating a

weak pull-up and a weak pull-down on the same output will be ignored and set a WRT_fail

bit.

Weak pull-up/pull-down currents are available for both the integrated and the external Half-

bridge controllers. This allows the user to determine if there is a short to ground or supply

condition on these outputs prior to actuation.

2.6.5

Dynamic output state detection

All outputs, internal and external have the ability to detect if the output voltage is above or

below a specific threshold (VOUT_th). If the Output voltage at the time CSN falls is above the

threshold the corresponding bit in Diagnostic register 11H is set high. If the output voltage is

below the threshold then the corresponding bit is set low.

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