L99UDL01 datasheet(60/88 Pages) STMICROELECTRONICS

60 / 88 page

Programmers guide

L99UDL01

60/88

DS12511 Rev 5

tOFF_x

These bits set up the dynamic braking mode duration. Dynamic braking occurs immediately

after the on-time actuation is complete. Dynamic braking is active on all outputs except

where overridden (Output Override) or disabled (Dynamic Braking Disable). During dynamic

braking, low side drivers (internal and external) are turned on for the duration commanded

by the tOFF_x bits. When the indefinite dynamic braking mode, [1:1], is selected a new

actuation cannot start until after an initial 100ms of dynamic braking time.

Indefinite braking can be stopped by appropriately programming register CR02H (tOFF bits

[1,2]) and initiating an actuation (i.e. setting OUT_ON=1). One example would be

programing tOFF=tON=0, disabling all timed and unused outputs in CR00H and CR01H and

initiating an actuation. Entering in Emergency mode with OUT_ON=0 stops the indefinite

braking

tON_x

Three bits set up the on-time duration during lock / unlock actuation. These bit are global

since they act upon all appropriate outputs together.

DBN_1

Dynamic Braking disable for Internal bridge 1

tON_4

Latch on-time duration bit 4

tON_3

Latch on-time duration bit 3

tON_2

Latch on-time duration bit 2

tON_1

Latch on-time duration bit 1

tON_0

Latch on-time duration bit 0

tOFF _1

Dynamic braking duration bit 1

tOFF _0

Dynamic braking duration bit 0

0Parity

Table 34. Brake duration bits

tOFF _1

tOFF _0

Duration (ms)

100

200

100 + Indefinite

Table 33. 02H Configuration bit description (continued)

Bit#

Command

Description

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