No power-on reset

Power-on reset

POR Threshold

Undefined

0.00

Operation Threshold

Supply Min

Supply Max

Supply (V)

Specified supply

voltage range

17

DAC11001A, DAC91001, DAC81001

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SLASEL0 – OCTOBER 2019

Product Folder Links: DAC11001A DAC91001 DAC81001

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8.3.4 Internal Power-On Reset (POR)

POR signals are ANDed together, so that all supplies must be at the minimal specified values for the device to

not be in a reset condition. These POR circuits initialize internal registers, as well as set the analog outputs to a

known state while the device supplies are ramping. All registers are reset to default values. The DACx1001

power on with the DAC registers set to zero scale. The DAC can be powered down by writing 1 to PDN (bit 4,

address 02h). Typically, the POR function can be ignored as long as the device supplies power up and maintain

the specified minimum voltage levels. However, in the case of supply drop or brownout, the DACx1001 can have

Figure 4. Relevant Voltage Levels for the POR Circuit

supply less than 1.6 V (POR threshold), the internal POR resets as long as the supply voltage is less than 1.6 V

for approximately 1 ms.

supply less than 3.3 V (POR threshold), the internal POR resets as long as the supply voltage is less than 3.3 V

for approximately 1 ms.

supply less than 6 V (POR threshold), the internal POR resets as long as the supply voltage is less than 6 V for

approximately 1 ms.

supply greater than –1.8 V (POR threshold), the internal POR resets as long as the supply voltage is higher than

–1.8 V for approximately 1 ms.