VNQ7003SYTR datasheet(13/102 Pages) STMICROELECTRONICS

13 / 102 page

DS11059 Rev 8

13/102

VNQ7003SY

Functional description

This mechanism avoids entering the standby mode unintentionally.



If VDD falls below VDD_POR_OFF, the device enters Reset mode.

Transition to Fail-Safe-mode from Normal mode, using the SPI register

Only one frame is needed.

Transition to Fail-Safe-mode from Normal mode by SW-Reset

SPI Reset is occurring by using the “Read device information” command (applicable only on ROM area)

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

Only one frame is needed.

2.2.4

Normal mode

In this mode, all device functions are available. The transition to this mode is only possible from a

previous Fail-Safe mode.

Outputs can be driven by SPI commands or a combination of SPI command and direct inputs INx.

To maintain the device in normal mode, the watchdog toggle bit in register CONFIG has to be toggled

within the watchdog timeout period tWDTB (see Table 58: Dynamic characteristics - Mode 1or Table 59:

Dynamic characteristics - Mode 2).

Table 2. Frame 1: write CTRL 0x00

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Command

OC1

OC0

Address

Data

x(1)

1. To avoid an SPI Error Frame due to a stuck at Zero, one bit of data field has to be at '1'. Bit “EN” has to be at ‘0’ to force the

device in Fail safe mode.

x(1)

GOSTBY

UNLOCK

x(1)

EN(1)

X(2)

2. X: do not care.

Table 3. Frame 1: read (ROM) 0x3FH 0x--

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Command

OC1

OC0

Address

111

Data(1)

1. The "X" data field cannot be all ones, otherwise a stuck to VDD is detected.

xxxx

X(2)

2. X: do not care.

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