L9960 datasheet(71/95 Pages) STMICROELECTRONICS

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DS11115 Rev 10

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L9960, L9960T

Functional description

4.8.7

Off-state diagnostic

The Off-state diagnostic is activated via a dedicated SPI command “OFF STATE diagnosis”

by enabling the bit TRIG.

Note:

(-) available in the D0 bit position in SPI command frame 9.

Once diagnosis sequence was performed, Off-state Diagnostic result is available through

the same SPI command “OFF STATE diagnosis”.

This diagnostic is performed in disable state condition, set only by DIS activation and on

the condition that there was not a protection previously set (reported in NGFAIL and

VPS_UV), which means during a disable state phase occurring after an active-state phase

of the bridge or after reset state only in case of DIS activation.

Off state diag is allowed when NGFAIL = '1' - Off state diag is allowed when NGFAIL = '0'

only when the source of failure is from OFF state diagnostics itself.

Off-state diagnostic sequence

Figure 31. Structure and detection criteria

If the load is connected and when the off state diagnostics is enabled, L9960 aims at

regulating the voltage on OUT1 at a typical value of 1.8 V with a typical current consumption

of 300 µA.



Short to Ground is detected if I0 < - 930 µA (typ). SCG fault is guaranteed for currents

higher than SCG threshold.



Short to Battery is detected if I0 is >190 µA (typ). SCB fault is guaranteed for currents

lower than SCB threshold.



Openload is detected if I0 > min (OUT1_OL_Thr) to min (OUT1_SCB_Thr)

In order to avoid any wrong diagnostic, a filtering time "Thz" is implemented before

performing the diagnostic.

Thz is started on DIS rising edge event or reset (POR/SW) event only.

Table 84. TRIG

Bit config

Description

Condition

OFF-state diagnosis not triggered

Reset value

Trigger OFF-state diagnosis

Current

comparison

OUT1

OUT2

300μA

1.8V

SCB

SCG

load

regulator

GAPGPS02412

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