L9908 datasheet(57/152 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test condition

Min Typ Max Unit

Notes

BT_lim1_sat_drop

BT charge limiter1 VRE-CBS_n drop

voltage for ICBS_n = 0 mA

CBS_n = Open

335 490 535

mV [n = 1,2,3]

1. Not subject to production test. This is an equivalent resistance, its value shall be used for bootstrap charge timings

estimation only.

5.11.5

VCP monitor

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

filtering time is implemented.

If VCP ≤ VCP_uv_th occurs for an interval longer than T_vcp_uv_flt filtering time, the VCP_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 VCP ≥ VCP_ov_th occurs for an interval longer than T_vcp_ov_flt filtering time, the VCP_OV flag is set. The

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

To avoid UV detection during power up VCP monitor comparators are masked for a T_vcp_boot_mask filtering

time, starting from each low to high transition of the internal CP1 enabling command.

Figure 31. VCP UV boot masking

Table 54. VCP Monitor electrical characteristics

Symbol

Parameter

Test Condition

Min Typ Max Unit

Notes

VCP_uv_th

VCP-VDH under-voltage

threshold

4.5

5.1

5.8

Comparator output Low to

High

VCP_uv_hys

VCP under-voltage hysteresis

200 300 400

mV -

T_vcp_uv_flt

VCP under-voltage detection

filter time

CLK_SSM_EN = 0

μs

Digital filter guaranteed

through scan pattern

VCP_ov_th

VCP-VDH over-voltage

threshold

15.8 17.6 19.5

Comparator output Low to

High

VCP_ov_hys

VCP over-voltage hysteresis

325 500

mV -

T_vcp_ov_flt

VCP over-voltage detection

filter time

CLK_SSM_EN = 0

μs

Digital filter guaranteed

through scan pattern

T_vcp_boot_mask VCP boot masking time

1.7

2.3

ms -

L9908

Functional description

DS13546 - Rev 5

page 57/152

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