MAX6872 データシートの表示（PDF） - Maxim Integrated

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MAX6872

EEPROM-Programmable, Hex/Quad, Power-Supply Sequencers/Supervisors

Maxim Integrated 

EEPROM-Programmable, Hex/Quad,

Power-Supply Sequencers/Supervisors

Table 2. IN1 Threshold Settings

REGISTER

ADDRESS

EEPROM

MEMORY

ADDRESS

00h

8000h

06h

8006h

0Ch

800Ch

0Dh

800Dh

BIT

RANGE

[7:0]

[7:0]

[0]

[0]

DESCRIPTION

IN1 primary undervoltage detector threshold (V1A) (see equations in the High-Voltage Input

(IN1) section).

IN1 secondary undervoltage/overvoltage detector threshold (V1B) (see equations in the

High-Voltage Input (IN1) section).

IN1 secondary overvoltage/undervoltage selection:

0 = overvoltage threshold. 1 = undervoltage threshold.

IN1 range selection:

0 = 2.5V to 13.2V range in 50mV increments. 1 = 1.25V to 7.625V range in 25mV increments.

Table 3. IN2 Threshold Settings

EEPROM

REGISTER

ADDRESS

MEMORY

ADDRESS

BIT

RANGE

DESCRIPTION

01h

8001h

[7:0]

IN2 primary undervoltage detector threshold (V2A) (see equations in the Bipolar-Voltage

Input (IN2) section).

07h

8007h

[7:0]

IN2 secondary undervoltage/overvoltage detector threshold (V2B) (see equations in the

Bipolar-Voltage Input (IN2) section).

0Ch

800Ch

[1]

IN2 secondary overvoltage/undervoltage selection:

0 = overvoltage threshold. 1 = undervoltage threshold.

IN2 range selection:

00 = -2.5V to -15.25V range in 50mV increments.

0Dh

800Dh

[7:6] 01 = -1.25V to -7.625V range in 25mV increments.

10 = +2.5V to +15.25V range in 50mV increments.

11 = +1.25V to +7.625V range in 25mV increments.

x = −(VTH − 1.25V) for − 1.25V to − 7.625V range

0.025V

x = VTH − 2.5V for + 2.5V to + 15.25V range

0.05V

x = VTH − 1.25V for + 1.25V to + 7.625V range

0.025V

where VTH is the desired threshold voltage and x is the

decimal code for the desired threshold (Table 3).

IN3–IN6

IN3–IN6 offer positive voltage detectors monitor volt-

ages from +1V to +5.5V in 20mV increments, or +0.5V

to +3.05V in 10mV increments. Use the following equa-

tions to set the threshold voltages for IN_:

x = VTH − 1V for + 1V to + 5.5V range

0.02V

x = VTH − 0.5V for + 0.5V to + 3.05V range

0.01V

where VTH is the desired threshold voltage and x is the

decimal code for the desired threshold (Table 4). For

the +1V to +5.5V range, x must equal 225 or less, oth-

14 ______________________________________________________________________________________

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