L9966 datasheet(12/122 Pages) STMICROELECTRONICS

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5.6

Operating modes

The state machine operation is summarized in the state diagram of Figure 5. Every time RST pin rises, the IC

enters INIT mode, remaining for PB (blanking time); once this time has expired, if a fault is detected the IC enters

FAULT mode, NORMAL mode otherwise. Only once NORMAL mode is entered, the IC is fully running and SPI

gets ready to process commands.

Figure 5. Operating mode state diagram

GADG0401181519PS

Table 7. Transition between operation modes

From

Description

OFF

EEPROM_download

FSM (Finite State Machine) changes from OFF to EEPROM_download in case a

rising edge of POR is detected (supply on in terms of internal 3V3 internal supply

is stable).

EEPROM_download

WAKE

FSM changes from EEPROM_download to WAKE when EEPROM (NVM, Not

volatile memory) is ready (trimming bit saved in memory). Based on data validity

a trimming fault flag can be asserted.

In case of fault detection, in terms of DIAGNOSTIC not OK or CALIB_FLT/

TRIM_FLT detection (available on GEN_STATUS register) after a timeout

(NVM_timeout) the IC moves anyway in WAKE status.

WAKE output pin and WAK_UP_FLG in GEN_STATUS register are asserted

high. Once read, the WAK_UP_FLG is cleared and the WAKE pin goes to zero.

WAKE

INIT

FSM changes from WAKE to INIT in case a rising edge of RST is detected

During this transition, status of CTRL_CFG pin is latched to determine SPI chip

address.

INIT

NORMAL

FSM changes from INIT to NORMAL when diagnostic check is ok for PB time.

INIT

FAULT

FSM changes from INIT to FAULT when diagnostic check is not ok for at least PB

time_TIMEOUT.

L9966

Operating modes

DS12459 - Rev 10

page 12/122

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