L99UDL01 datasheet(57/88 Pages) STMICROELECTRONICS

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DS12511 Rev 5

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L99UDL01

Programmers guide

OUT_ON

If the OUT_ON bit is not set when writing to this register then the outputs will be initiated or

actuated per the programming on the rising edge of EN_OUT. If the OUT_ON bit in the

programmed sequence, provided that EN_OUT=1. It should be noted that writing

OUT_ON=1 during a timed actuation outside of an Emergency mode is NOT supported and

is not recommended.

It needs to take care there are many registers that set up polarity and actuation parameters.

When not in timed actuation the OUT_ON bit will initiate actuation upon the rising edge of

CSN (provided that EN_OUT=1) using the information that is in all registers. If the OUT_ON

bit is set before the other registers are programmed, erroneous behavior may result.

In emergency mode (and EN_OUT=1) the rising edge of CSN will actuate what is in the

registers if the OUT_ON bit is set regardless any timed actuation in progress.

OUTx_on / EX_OUTx_on

These bits will override the programmed timed outputs. If this bit is set, it will turn on the

indicated output according to the output configuration (high side / low side) indefinitely. This

will occur on the rising edge of CSN regardless of the state of the OUT_ON bit or any other

OUTx_on/ EX_OUTx_on bit is reset or EN_OUT=0. Disengaging an output override only

disables that output.

OUTx_on and EX_OUTx_on bits must not be changed at the initiation of or during a timed

actuation. Indefinite dynamic braking must be disabled before changing any of the output

override bits (OUTx_on, EX_OUTx_on in register 01H) or any of the overridden outputs

polarities.

OUTx_on works for paralleled outputs as well. To actuate a group of outputs using

OUTx_on first assign the appropriate outputs to be in parallel, then drive the master

OUTPUT for that group (OUT1 or OUT4) using the OUTx_on bit. OUTx_on will not work

when an output is grouped and an output, other than a master output, is commanded on.

For instance:

OUT1_on

Output 1 on override

EMCY1

Emergency override Bit 1

EMCY0

Emergency override Bit 0

EXT2_HSD

External H-Bridge 2 Output High Enable

EXT1_HSD

External H-Bridge 1 Output High Enable

EXT2_LSD

External H-Bridge 2 Output Low Enable

EXT1_LSD

External H-Bridge 1 Output Low Enable

OUT_ON

If set will actuate ALL outputs on CSN rising

0Parity

Table 30. 01H Command description (continued)

Bit#

Command

Description

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