L99MC6 datasheet(36/55 Pages) STMICROELECTRONICS

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SPI control and status register

L99MC6

36/32

Doc ID 16523 Rev 2

9.3.1

Channel configuration decoding

9.3.2

Table 29.

Channel configuration decoding

CHx

[2]

CHx

[1]

CHx

[0]

CHx

PWM

mode

Overcurrent

recovery

Slew Rate

Open-load

detection

000

Off(1)

High

Off

111

Off(1)

Low

High

Low

011

Yes

Low

IN/PWM(2)

Yes

High

Off

IN/PWM(2)

Yes

Low

The state of the channel 2 is according to the IN/PWM signal

The output state is according to the IN/PWM signal, note that bridge mode and PWM mode may not be activated at the

same time for channels 2 and 5.

Table 30.

Name

Comment

Global device enable bit. If this bit is reset, the device goes in standby mode.

CHx

[2:0]

Channel output configuration (see

Figure 29).

Note that channel 2 is directly driven by the external IN/PWM pin and thus can not be configured

independently from the PWM configuration of other channels.

Bridge

Activate Bridge mode between channels 3 and 6, channels 2 and 5, channels 1 and 4. Any

polarity change is delayed by masking time of cross conduction protection

If wrong SPI commands try to turn on the channels 3 and 6, channels 2 and 5, channels 1 and 4

simultaneously, the high-side (channels 3, 2, 1) has the priority whereas channels 6, 5, 4 is (or

stay) deactivated.

ENCP

This bit is preset to ‘1’ at startup. To deactivate the internal charge pump ENCP has to be reset

together with setting DISCP (CTRL 2). This mechanism avoids unwanted charge pump

deactivation after an undetected communication error.

It is recommended to check the state of the charge pump deactivation bits at every access of

CTRL 1 and CTRL 2.

DISCP

This bit is reset to ‘0’ at startup. To deactivate the internal charge pump DISCP has to be set

together with resetting ENCP (CTRL 1)

TSD

Overtemperature detected: all the drivers are shutdown

TWARN

Overtemperature warning level detected, information only

OL [6:1]

Open-load error detected, information only

OC [6:1]

Overcurrent error detected, drivers are deactivated and re-enabled cyclically when bulb mode is

configured. Note: in order to detect a real overload condition, the application software must make

sure, that the corresponding OC bit remains cleared after a maximum heat up time of the load.

Every output stage is protected against overtemperature and overcurrent. While still configured as ON, the output stage

can be deactivated by the corresponding error bits in the status registers. In order to reactivate the drivers, the status

registers have to be cleared by a specific SPI command.

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