L99DZ320 datasheet(65/146 Pages) STMICROELECTRONICS

65 / 146 page

3.14

Power outputs HB4, ..., HB6, HS7 .. HS15 and HS0

The component provides a total of 3 half bridges outputs HB4,…, HB6 to drive motors and 9 stand-alone high-

side outputs HS7,…, HS15 and HS0 to drive for example LED’s, bulbs or to supply contacts. All high-side outputs,

except HS15 and HS0, are supplied by the pin VS. HS15 and HS0 are instead supplied by the buffered supply

VSREG. HS0 is intended to be used as contact supply.

Only HS15 and HS0 can be activated in standby modes.

All high-side and low-side outputs switch OFF in case of:

•

VS overvoltage and undervoltage (depending on configuration, see Section 3.12: Power supply fail)

•

Overcurrent (depending on configuration, overcurrent recovery mode, see below)

•

Over temperature (TSD1)

•

Fail-safe event

•

Loss of ground at SGND pin

In case of overcurrent or over temperature (TSD1 bit in SR8) condition, the drivers switch off. The corresponding

status bit is latched and can be read and optionally cleared by SPI. The drivers remain off until the status is

cleared.

In case overvoltage/undervoltage condition, the drivers are switched off. The corresponding status bit is latched

and can be read and optionally cleared by SPI. If the Vlockout bits are set to ‘1’ the drivers remain off until the

status is cleared. If the Vlockout bit is set to ‘0’ the drivers switch on automatically if the error condition

disappears. Undervoltage and overvoltage shutdown can be disabled by setting <VS_UV_SD_EN> respectively

<VS OV SD_EN> to ‘0’. In case of open-load condition, the corresponding status register is latched. The status

can be read and optionally cleared by SPI. The high and low-side outputs are not switched off in case of open-

load condition.

For HB4, …, HB6 the overcurrent recovery feature can be enabled by setting the HBx_OCR bit in CR13 (x = 4,..,

6); for HS7…HS9 the overcurrent recovery feature can be enabled by setting the HSy_OCR bit in CR13 (y =

7,..,9). If these bits are set to ‘1’ the driver is automatically restarted from an overload condition. This overload

recovery feature is intended for loads which have an initial current higher than the overcurrent limit of the output

(for example inrush current of cold light bulbs). For HB4, HB5 and HB6 only, overcurrent threshold can be set via

SPI (HBxOCTH_y bits in CR16, x = 4, 5, 6 and y = 0, 1) among three different values.

Each of the stand-alone high-side driver outputs HS7, …, HS15 and HS0 can be driven through:

•

An internal generated PWM signal

•

An internal timer

•

One of the two direct drives (DIR1, DIR2)

When L99DZ320 is in V1_Standby or VBAT_Standby modes, HS0 and HS15 can be directly driven with DIR1/EI2

pin or PWM6/DIR2 pin.

Moreover, for each high-side driving LEDs, it is also available the “constant current mode” feature, which is

configurable by SPI (CR3) and provides a constant current to the related output. This bit can be set only if the

related driver is in OFF state and disables also its overcurrent and short-circuit detection (open-load detection

remains ON). The “constant current code” is automatically disabled after the expiration time tCCMtimeout.

The allowed sequence is the following:

•

Set HSx_CCM bit (x = 7, .., 15, 0), then turn ON the driver (other configurations are ignored): driver starts

in current mode for tCCMtimeout, then switches to ON mode, CCM is cleared by µC

–

If HSx_CCM bit is cleared by µC before timeout then driver is switched to ON mode

–

If CCM bit is set after driver has been started in ON, PWM, timer modes then CCM bit is ignored

•

SC and OC are enabled in ON, PWM and timer modes, not in current mode

•

Default value for CCM bit is OFF

L99DZ320

Functional description

DS14235 - Rev 5

page 65/146

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