L9959S datasheet(28/43 Pages) STMICROELECTRONICS

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Application information

L9959S, L9959T

28/43

DocID023416 Rev 6

Lower threshold

The under-voltage threshold can be increased to VTEST_THL using CONFIG1 and CONFIG2

in the STATCON register. Since the VDD voltage is below VTEST_THL, the resulting VDD-

undervoltage resets STATUS0.

After leaving the VDD-monitor test mode, the bits in the STACON register return to their

normal state.

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 22. 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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