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DAC53401, DAC43401

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SLASES7 – JULY 2019

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Table 5. FUNC_CONFIG bits

REGISTER ADDRESS AND NAME

FUNC_CONFIG[1]

FUNC_CONFIG[0]

DESCRIPTION

D1h, GENERAL_CONFIG

0

0

Generates a triangle wave between

MARGIN_HIGH (address 25h) code to

MARGIN_LOW (address 26h) code with

slope defined by SLEW_RATE (address

D1h) bits

0

1

Generates Saw-Tooth wave between

MARGIN_HIGH (address 25h) code to

MARGIN_LOW (address 26h) code, with

rising slope defined by SLEW_RATE

(address D1h) bits and immediate falling

edge

1

0

Generates Saw-Tooth wave between

MARGIN_HIGH (address 25h) code to

MARGIN_LOW (address 26h) code, with

falling slope defined by SLEW_RATE

(address D1h) bits and immediate rising

edge

1

1

Generates a square wave between

MARGIN_HIGH (address 25h) code to

MARGIN_LOW (address 26h) code with

pulse high and low period defined by

SLEW_RATE (address D1h) bits

8.4.3 PMBus Compatibility Mode

commands that are implemented in DACx3401.The DAC uses MARGIN_LOW (address 26h), MARGIN_HIGH

(address 25h) bits, SLEW_RATE, and CODE_STEP bits (address D1h) for PMBUS_OPERATION_CMD.

Table 6. PMBus Operation Commands

REGISTER ADDRESS AND NAME

PMBUS_OPERATION_CMD[15:8]

DESCRIPTION

01h, PMBUS_OPERATION

00h

Turn off

80h

Turn on

A4h

Margin low

94h

Margin high

The DACx3401 also implements a time-out failure feature for PMBus mode. The CML bit (address 78h) indicates

the status of the PMBus. This bit can be reset by writing 1.

To read the PMBus version, read the PMBUS_VERSION bits (address 98h).

8.4.4 Medical Alarm Generation Mode

The DACx3401 can also be used to generate continuous alarm tones for medical devices. Use a suitable analog

mixer, audio amplifier, and a speaker to generate low, medium, or high priority alarm tones. See the Application

and Implementation section for more details. The DACx3401 allows tunability and configurability to support

different alarm generation. Using this approach, configurable medical alarm tones can be generated with a

simple circuit, and with no need for runtime software.

8.4.4.1 Low-Priority Alarm

The MED_ALARM_LP bit (address D2h) is used to trigger a medical low-priority alarm generation. The DAC

generates a continuous-alarm signal until this bit is set back to 0. After the bit is set to 0, the device does not

abruptly end the alarm generation; the device stops only after completing the ongoing burst.

8.4.4.2 Medium-Priority Alarm

The MED_ALARM_MP bit (address D2h) is used to trigger a medical medium-priority alarm generation. The DAC

generates a continuous-alarm signal until this bit is set back to 0. After the bit is set to 0, the device does not

abruptly end the alarm generation; the device stops only after completing the ongoing burst.