VNF9D5F datasheet(9/108 Pages) STMICROELECTRONICS

9 / 108 page

Operating mode

Entering conditions

Leaving conditions

Characteristics

Battery

undervoltage:

transition phase

(not device

operating mode)

Any mode: VCC < VUSD

During this case, if the DIx is changed, the

operation mode is not changed and the output

state will be changed accordingly after VCC

recovering.

If VDD NOT present AND

VREG > VREG_POR_H

• Digital current-sense diagnostic: not available

• Output Stages are off regardless SPI or DIx

status

• SPI: active but communication not possible

• Diagnostic: NOT available

• Registers: reading is not possible

• VCCUV flag set, SPI registers content retained.

SPI register content reading always possible

If VCC > VUSD + VUSDhyst, the device comes

back to the last mode and the VCCUV flag is

cleared.

In this case, the operation mode is not changed

and the output state is changed accordingly after

VCC recovering.

If VREG < VREG_POR_L

• Digital current-sense diagnostic: not available

• Output stages are off regardless SPI or DIx

status

The device is reset, the last operation mode is

lost, the logic is unpowered and the device

enters sleep mode as soon as

VCC > VUSD + VUSDhyst.

Transition to fail-safe mode from sleep mode and standby mode

It is mandatory to send a software reset command after the transition to fail-safe mode from sleep mode or

standby mode.

Transition to fail-safe mode from normal mode, using the SPI register

Only one frame is needed: write “CTRL” 0x0001.

Table 3. Frame 1 (write CTRL 0x0001)

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

CMD

OC1

OC0

Address

DATA1

GOSTBY

UNLOCK

Not Used

PWM_TRIG

Not Used

DATA2

LOCKbit5

LOCKbit4

LOCKbit3

LOCKbit2

LOCKbit1

LOCKbit0

PWMSYNC

Parity

Transition to fail-safe mode from normal mode by SW-reset

SPI Reset occurs by using the “read device information” command (applicable only on ROM area) at the reserved

ROM address 0x3F. This is equivalent of sending a 0xFF command.

Only one frame is needed: read “ROM” 0x3F 0x--.

VNF9D5F

Functional description

DS13946 - Rev 8

page 9/108

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