PMBus 5-Channel Power-Supply Manager
and Intelligent Fan Controller
MAX34441
11
Pin Description (continued)
Note: All pins except V
DD
, V
SS
, REG18, REG25, ADC, and the EP are high impedance with a 50µA pullup during device power-up
and reset. After device reset, the weak pullup is removed, and the pin is configured as input or output.
PIN NAME FUNCTION
20 PWM3
PWM Margin Output #3. High impedance when the margining is disabled. A 100% duty cycle implies
this pin is continuously high.
22 REG18
Regulator for Low-Voltage Digital Circuitry. Bypass REG18 to V
SS
with 1FF and 10nF capacitors. Do
not connect other circuitry to this pin.
23 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.
24 PWM2
PWM Margin Output #2. High impedance when the margining is disabled. A 100% duty cycle implies
this pin is continuously high.
25 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.
26 PWM1
PWM Margin Output #1. High impedance when the margining is disabled. A 100% duty cycle implies
this pin is continuously high.
27 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.
28 PWM0
PWM Margin Output #0. High impedance when the margining is disabled. A 100% duty cycle implies
this pin is continuously high.
29 REG25
Regulator for Analog Circuitry. Bypass REG25 to V
SS
with 1FF and 10nF capacitors. Do not connect
other circuitry to this pin.
30 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.
31 SDA I
2
C/SMBus-Compatible Input/Output
32 SCL I
2
C/SMBus-Compatible Clock Input
33 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 V
SS
or
V
DD
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.
34
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.
35 CONTROL
Device Enable. Option through ON_OFF_CONFIG for active-low or active-high power-supply control.
This pin has a 50Fs deglitch filter.
37
A1/PG/
TACHSEL
SMBus Address 1 Input/Power-Good Output. This triple-function pin is sampled on device power-
up to determine the SMBus address; connect a 100kI resistor from this pin to either V
SS
or V
DD
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. Alternately,
this pin can be programmed through MFR_MODE to select between two tachometers in dual-fan
applications.
38
ALERT
Active-Low, Open-Drain Alert Output
39 RS-5 Thermal Diode ADC Voltage Negative-Sense Input, Measurement Relative to RS+5
40 RS+5 Thermal Diode ADC Voltage Positive-Sense Input, Measurement Relative to RS-5
— EP Exposed Pad (Bottom Side of Package). Connect EP to V
SS
.
(13 paginas)
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