L99MC6 datasheet(13/55 Pages) STMICROELECTRONICS

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L99MC6

Description

Doc ID 16523 Rev 1

13/55

2.2

Standby mode

The standby mode of the L99MC6 is activated by SPI command (EN bit of CTRL 0 reset to

0, see Section 9.3.2: Register description). The inputs and outputs are switched-off. The

status registers are cleared and the control registers are reset to their default values.

In the standby mode the current consumption is 5 µA (typical value). A SPI command is

needed to switch the L99MC6 in normal mode.

2.3

Inductive loads

Each switch is built by a power DMOS transistor. For low-side configured outputs an internal

zener clamp from the drain to gate with a breakdown of 31 V minimum provides for fast turn-

off of inductive loads.

For high-side configured outputs, an internal zener clamp with a breakdown of -15 V

maximum provides for fast turn-off of inductive loads (Figure 5).

The maximum clamping energy is specified in Chapter 10.

Figure 5.

Output voltage clamping

2.4

Diagnostic functions

All diagnostic functions (overload, open-load, temperature warning and thermal shutdown)

are internally filtered and the condition has to be valid for at least 32 µs (open-load: typ.

400 µs, respectively) before the corresponding status bit in the status registers are set. The

filters are used to improve the noise immunity of the device. Open-load and temperature

warning function are intended for information purpose and do not change the state of the

output drivers. On contrary, the overload and thermal shutdown condition disable the

corresponding driver (overload) or all drivers (thermal shutdown), respectively. Without

setting the overcurrent recovery bit in the input data register to logic high, the microcontroller

has to clear the overcurrent status bit to reactivate the corresponding driver. (All switches

have a corresponding overcurrent recovery bit) If this bit is set, the device automatically

switches-on the outputs again after a short recovery time. With this feature the device can

drive loads with start-up currents higher than the overcurrent limits (that is inrush current of

incandescent lamps, cold resistance of motors and heaters, Figure 7).

Time

Low Side Configuration

GND

Drain Clamp

Voltage

(VDRN_CL1-6) = 35V)

Output Current

Drain Voltage

Time

High Side Configuration

Source Voltage

Output Current

GND

Source Clamp

Voltage

(VSRC_CL1-3) = -19V)

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