L9908 datasheet(51/153 Pages) STMICROELECTRONICS

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5.11.2

VBP monitor

VBP voltage level is monitored be means of the dedicated UV and OV diagnosis. Hysteresis on thresholds and

filtering time is implemented.

If VBP ≤ VBP_uv_th occurs for an interval longer than T_vbp_uv_flt filtering time, the VBP_UV flag is set. The

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

If VBP ≥ VBP_ov_th occurs for an interval longer than T_vbp_ov_flt filtering time, the VBP_OV flag is set. The

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

The correct operation VBP Level monitor is safety relevant and then a self-check procedure is implemented.

The under-voltage threshold VBP_uv_th can be configured by dedicated SPI bits within the

SAFETY_RELEVANT3 register as follows:

Table 45. VBP monitor UV threshold configuration bits

VBP_UV_CFG1

VBP_UV_CFG0

Description

12 V Systems (Defaults)

24 V Systems

48 V Systems

VBP UV Disabled

The over-voltage threshold VBP_ov_th can be configured by dedicated SPI bits within the SAFETY_RELEVANT2

Table 46. VBP monitor OV threshold configuration bits

VBP_OV_CFG1

VBP_OV_CFG0

Description

12 V Systems 1

12 V Systems 2

24 V Systems 1

24 V Systems 2 (Defaults)

The filter time on under/over voltage diagnosis T_vbp_uv_flt/ T_vbp_ov_flt can be configured by dedicated SPI

bits within the SAFETY_RELEVANT3 register as follows:

Table 47. VBP monitor filtering configuration bits

VBP_FLT_CFG1

VBP_FLT_CFG0

Description

12.25 μs (Defaults)

25 μs

50 μs

100 μs

L9908

Gate driver supply

DS13546 - Rev 3

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