L9959 datasheet(31/49 Pages) STMICROELECTRONICS

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L9959

Application information

4.8

Power-on reset

At power-on, while VDD increases, the internal registers are cleared and the outputs are set

to tristate at the reset-active voltage VDDRES. Above the power-on reset threshold VDDPOR

the device starts to operate after the time tPOR. If VDD drops below VDDPOR, the device

enters its reset state, i.e. all internal registers are cleared and the outputs are set to tristate.

Note:

All voltages are nominal. Please refer to Section 3: Electrical specifications for their

specified values.

Table 23. Device states with respect to supply voltage

VS [V]

VDD [V]

Functional state

28 – 40

0 – 18

No damage to the device, no functional behavior guaranteed

4.5 – 6.5

4.5 – 5.5

Device functional, Current Feedback accuracy reduced

6.5 – 28

4.5 – 5.5

Device functional

4.5 – 28

4.0 – 4.5 5.5 - 18

Device functional, but power-outputs tristate by VDD-monitor, /ABE

pulled to low, SPI functional

0 – 4.5 4.5 – 28

VDDPOR – 4.5 Device in reset mode, SPI functional, power-outputs tristate, /ABE pulled to low

0 – 4.5 4.5 – 28

2.5 - VDDPOR

Device in reset mode, SPI reset, power-outputs tristate, /ABE tristate

0 – 4.5

4.5 – 5.5

Device functional, outputs are tristate by VS-undervoltage

0 – 4.5

4.0 – 4.5 5.5 - 18

Device functional, outputs are tristate by VS-undervoltage and VDD-

monitor, /ABE pulled to low

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