L99DZ120 datasheet(63/162 Pages) STMICROELECTRONICS

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L99DZ120

Application information

161

4.3.5

Interrupt

Figure 23. NINT pins

RxDL/NINT indicates:



a wake-up event from V1_standby mode and the programmable timer interrupt

RxDL/NINT pin is pulled low for t = tinterrupt.

NINT indicates:



In Active mode:

VSREG dropped below the programmed early warning threshold in Control Register 3

(VSREG < VSREG_EW_TH); feature is deactivated if VSREG_EW_TH is set to 0 V.

In V1_standby mode

–

Programmable timer interrupt; An NINT pulse is generated at the beginning of the

timer on-time (Timer 1 or Timer2)

–

Wake-up from V1_standby mode by any wake-up source

NINT is pulled low for t = tinterrupt

In case of increasing V1 load current during V1_standby mode (IV1 > Icmp_ris), the device

remains in standby mode and the watchdog starts with a Long Open Window. No Interrupt

signal is generated.

4.3.6

VBAT_standby mode

The transition from Active mode to Vbat_standby mode is initiated by an SPI command. In

Vbat_standby mode, the voltage regulators V1 and V2 (depending on configuration in

CR 1), the power outputs (except OUT15 and OUT_HS) as well as LIN transmitter are

switched off.

An NReset pulse is generated upon wake-up from Vbat_standby mode.

4.4

Wake-up from Standby modes

A wake-up from standby mode will switch the device to Active mode. This can be initiated by

one or more of the following events:

L99DZ120 Datasheet(PDF) 63 Page - STMicroelectronics