L9960 datasheet(20/95 Pages) STMICROELECTRONICS

20 / 95 page

Functional description

L9960, L9960T

20/95

DS11115 Rev 10

Battery voltage monitoring electrical characteristics

Tj = -40 °C to 150 °C, VDD5 = 4.5 V to 5.5 V, Vps = 4 V to 28 V unless otherwise specified.

All voltages refer to GND. Currents are positive into and negative out of the specified pin.

Undervoltage protection

A counter is implemented to measure if two consecutive Vps under-voltage events occur

within a fixed time frame, defined by the parameter (UV_WIN), which is programmable via SPI

in two different values: 20 or 40 µs; if it happens, a specific bit named “UV_CNT_REACHED”

is set to 1 and the bridge is disabled.

The “UV_PROT_EN” bit is used to enable the counter UV_WIN and an echo answer is

available. In the tables below, the configuration and functions for each of these parameters

are shown:

Note:

(-) available in position D3 of the SPI command frame 4.

Note:

(-) available in position R3 of the SPI answer frame 7b.

Table 11. VPS electrical characteristics

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

Vs_clamp_neg

Negative clamp on

VPS battery line

-3 A from VPS, 3 ms

-2.5

-0.5

Vps_uv_off

Vps under-voltage

threshold

Vps decreasing

3.7

4.2

Vps_uv_on

Vps under-voltage

threshold

Vps increasing

4.2

4.7

Vps_uv_hys

Vps under-voltage

hysteresis

-0.1

Tvps_uv

Vps under-voltage

filtering time

(guaranteed by scan)

Digital filter

µs

Table 12. UV_PROT_EN

Bit status

Description

Condition

Counter and disabling protection are not enabled

Reset value

Counter and disabling protection are enabled

Table 13. UV_PROT_EN_echo

Bit status

Description

Condition

Echo counter and disabling protection not enabled

Reset value

Echo counter and disabling protection enabled

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