L99DZ200G datasheet(78/198 Pages) STMICROELECTRONICS

78 / 198 page

Application information

L99DZ200G

78/198

DS13220 Rev 5

Figure 22. Main operating modes

4.6

Configurable Window Watchdog

During normal operation, the watchdog monitors the microcontroller within a programmable

trigger cycle.

After power-on or standby mode, the watchdog is started with a timeout (Long Open Window

tLW). The timeout allows the microcontroller to run its own setup and then to start the window

watchdog by setting TRIG (CR1, Config Reg(e)) =1. Subsequently, the microcontroller has to

5. After power-on, the HS CAN transceiver is in CAN_TRX_SLEEP mode. It is activated by SPI command

(CAN_GO_TRX_RDY= 1).

6. ON, if cyclic sense is enabled or during wake-up request.

7. Cyclic activation = pulsed ON during cyclic sense.

8. In V1_Standby and VBAT_Standby modes OUT15 is ON only if it is not driven with an internally generated PWM signal.

9. ON in Fail-Safe mode; if standby mode is entered with active Fail-safe mode the output remains ON in standby mode.

Active

Mode

V1: ON

Reset Generator: active

Watchdog: active

V1 Standby

Mode

V1: ON

Reset Generator: active

Watchdog:

OFF (if Iv1<Icmp or ICMP = 1)

Vbat Standby

Mode

V1: OFF

Reset Generator: OFF(Nreset=low)

Watchdog: OFF

Wake-up

Event

Wake-up

Event

SPI command

Vbat startup

All registers

Set to default,

Chip Reset bit (RSTB)

= 1

Vs > Vpor

7x Thermal Shutdown TSD2

15 x WD fail

Flash Mode (LIN/CAN)

Functionality as in Active Mode

Watchdog: OFF

CAN Flash Mode:

CAN TRX RDY=1, RXEN=1, TXEN=1

LIN Flash Mode:

LIN_HS_en=1

VTXDL > Vflash

VTXDC > Vflash

VTXDL > Vflash

VTXDC > Vflash

VTXDL < Vflash

AND

VTXDC < Vflash

VTXDL > Vflash

VTXDC > Vflash

SPI command

7x Thermal Shutdown 2

V1 short to GND

(V1 < 2V for 4ms after switch ON)

15 x WD Failure

GAPG0408151614CFT

TRIG bits in CR1 and Config Reg are mirrored; either can be used for triggering the watchdog.

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