L9960T datasheet(22/95 Pages) STMICROELECTRONICS

22 / 95 page

Functional description

L9960, L9960T

22/95

DS11115 Rev 10

Figure 8. Battery voltage monitoring – case2

Case 2

In this scenario, after the second UV transition on VPS, with the enabled protection via

UV_PROT set to 1, if two UV events occur by the UV_WIN timeframe expiration, the H-

bridge is set in Disable condition consequently.

4.1.3

VDD5 regulated voltage supply

The VDD5 Input voltage is provided by an external power supply, supplying the

corresponding L9960 digital I/O's.

When VDD5 is not supplied, there is only a small leakage current sank from VPS, see

parametric table with condition VDD5 <0.7V.

Voltage supply range

The L9960 has a VDD5 operating voltage supply range from "VDD5_uv" up to "VDD5_ov"

thresholds, however, the absolute maximum rating is defined up to 19 V DC.

VDD5 under-voltage detection

NDIS status depends on the UV event duration affecting VDD5:



When the VDD5 voltage falls below the under-voltage detection threshold

"VDD5_uv_th" longer than a filter "TVDD5_uv1", the bridge is switched to disable.



When VDD5 voltage falls below the under-voltage detection threshold "VDD5_uv_th"

longer than "TVDD5_uv2", the condition is feedbacked to control logic, pulling LOW the

pin NDIS, NDIS pin is pulled to LOW.

When VDD5 voltage increases above the "VDD5_uv_th" threshold (hysteresis and

TVDD5_uv1 filtering implemented), under-voltage condition is removed and L9960 keeps

all the settings set.

The NDIS pin is released when under-voltage condition is removed, in condition that NDIS

was hold at least for a minimum time “Thold_ndis”.

The UV detection information is readable via 2 diagnostics bits called VDD_UV_REG

(latched) and VDD_UV (unlatched).

GAPGPS02314

Tvps _uv

T < Tvps _uv

Vps _uv _off

Vps

‘’VPS _UV’’

ON-STATE

TRISTATE

BRIDGE

STATE

Vps _uv _hys

Tvps _uv

DISABLE

T < UV_WIN

UV_CNT_REACHED

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