L9908_V01 datasheet(67/152 Pages) STMICROELECTRONICS

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Figure 40. Dead Time Protection functional operation

The T_dead_flt configuration can be set by the dedicated SPI signal DTP_CFG within the register GEN_CFG1 as

follows:

Table 61. Dead Time Protection configuration bits

DTP_CFG2

DTP_CFG1

DTP_CFG0

Description

0us – DTP Disabled

0.25 μs

0.35 μs

0.5 μs

1 μs – Default

1.5 μs

2 μs

4 μs

Table 62. Dead Time Protection accuracy

Symbol

Parameter

Test Condition

Min

Typ

Max

Unit

DTP_tflt_acc

Dead Time Filter accuracy

CLK_SSM_EN = 0

-15

Note:

All parameters are guaranteed, and tested, in the voltage ranges reported above in Table 5 unless otherwise

specified. Where not specified the parametrical operating range equals the functional operating range.

5.12.3

Shoot-Through Protection (STP)

Independently of the activation of DTP, L9908 implements a monitoring unit to detect the dangerous condition

when HS and LS of the same half bridge are driven on at the same time. The diagnosis is performed at two

levels: on the devices PWM inputs from uC (INHn/INLn) and on the Ext. FET Vgs; this allows a diagnosis

coverage both on external and internal shoot-through faults.

The first diagnosis level consists in a dedicated digital counter for each half bridge PWM inputs (INHn/INLn

couple) set/reset by the logic AND between INHn and INLn and integrates the time interval where the INHn and

the INLn are high together.

If INHn=INLn=’1’ occurs for an interval longer than T_stp_pwm_flt the flag STP_PWM_n is set. The error flag

remains set until the failure condition is removed and the flag is cleared by the SPI command.

L9908

Functional description

DS13546 - Rev 5

page 67/152

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