MAX34440 datasheet(11/43 Pages) MAXIM

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PMBus 6-Channel Power-Supply Manager

Pin Description (continued)

NAME

FUNCTION

PWM4

PWM Margin Output #4. High impedance when the margining is disabled. A 100% duty cycle implies

this pin is continuously high.

PSEN4

Power-Supply Enable Output #4. Programmable through MFR_MODE for either active high or active

low and either open drain or CMOS push-pull.

PWM3

PWM Margin Output #3. High impedance when the margining is disabled. A 100% duty cycle implies

this pin is continuously high.

REG18

Regulator for Low-Voltage Digital Circuitry. Bypass REG18 to VSS with 1FF and 10nF capacitors. Do

not connect other circuitry to this pin.

PSEN3

Power-Supply Enable Output #3. Programmable through MFR_MODE for either active high or active

low and either open drain or CMOS push-pull.

PWM2

PWM Margin Output #2. High impedance when the margining is disabled. A 100% duty cycle implies

this pin is continuously high.

PSEN2

Power-Supply Enable Output #2. Programmable through MFR_MODE for either active high or active

low and either open drain or CMOS push-pull.

PWM1

PWM Margin Output #1. High impedance when the margining is disabled. A 100% duty cycle implies

this pin is continuously high.

PSEN1

Power-Supply Enable Output #1. Programmable through MFR_MODE for either active high or active

low and either open drain or CMOS push-pull.

PWM0

PWM Margin Output #0. High impedance when the margining is disabled. A 100% duty cycle implies

this pin is continuously high.

REG25

Regulator for Analog Circuitry. Bypass REG25 to VSS with 1FF and 10nF capacitors. Do not connect

other circuitry to this pin.

PSEN0

Power-Supply Enable Output #0. Programmable through MFR_MODE for either active high or active

low and either open drain or CMOS push-pull.

SDA

I2C/SMBus-Compatible Input/Output

SCL

I2C/SMBus-Compatible Clock Input

A0/MUXSEL

SMBus Address 0 Input/Multiplexer Control Output. This dual-function pin is sampled on device

power-up to determine the SMBus address; connect a 100kI resistor from this pin to either VSS or

VDD to set the address. After device power-up, this pin becomes an output that acts as voltage/

current selector for an external analog multiplexer. MUXSEL is low for voltage measurements and

high for current measurements.

FAULT

Active-Low, Open-Drain Fault Input/Output. This pin is asserted when one or more of the power supplies

in a global group are shut down due to a fault condition. Also, this pin is monitored and, when it is

asserted, all power supplies in a global group are shut down. This pin is used to provide hardware

control for power supplies in a global group across multiple devices. This output is unconditionally

deasserted when RST is asserted or the device is power cycled. This pin has a 50Fs deglitch filter.

CONTROL

Device Enable. Option through ON_OFF_CONFIG for active-low or active-high power-supply control.

This pin has a 50Fs deglitch filter.

A1/PG

SMBus Address 1 Input/Power-Good Output. This dual-function pin is sampled on device power-up

to determine the SMBus address; connect a 100kI resistor from this pin to either VSS or VDD to set

the address. After device power-up, this pin becomes an output that transitions high when all the

enabled power supplies are above their associated POWER_GOOD_ON thresholds.

ALERT

Active-Low, Open-Drain Alert Output

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