Datasheet

MAX34451 PMBus 16-Channel V/I Monitor and
12-Channel Sequencer/Marginer
www.maximintegrated.com
Maxim Integrated │ 12
Detailed Description
The MAX34451 is a highly integrated system monitor
with functionality to monitor up to 16 different voltages or
currents and to sequence and close-loop margin up to 12
power supplies. It also supports local and remote thermal
sensing.
The power-supply manager monitors the power-
supply output voltage and current and constantly checks
for user-programmable overvoltage, undervoltage, and
overcurrent thresholds. It also has the ability to margin
the power-supply output voltage up or down by a user-
programmable level. The margining is performed in a
closed-loop arrangement, whereby the device automati-
callyadjustsaPWMsignaloranexternalcurrentDAC
output and then measures the resultant output voltage.
The power-supply manager can also sequence the
supplies in any order at both power-up and power-down.
Thermal monitoring can be accomplished using up to five
temperature sensors including an on-chip temperature
sensor and up to four external remote DS75LV digital
temperaturesensors.CommunicationswiththeDS75LV
temperature sensors is conducted through a dedicated
I
2
C/SMBusinterface.
The device provides ALERT and FAULTn output signals.
HostcommunicationsareconductedthroughaPMBus-
compatible communications port.
See Table 1 and Table 2 for more details on specific
device operation.
Table 1. PMBus PAGE to Pin/Resource Mapping
PMBus
PAGE
PIN NAME
RSn/GPIn
(16 AVAILABLE)
PSENn/GPOn
(12 AVAILABLE)
PWMn/GPOn
(8 AVAILABLE)
VOLTAGE
OR
CURRENT
MONITOR
GENERAL-
PURPOSE
INPUT
(GPI)
PIN
POWER-
SUPPLY
ENABLE
(PSEN)
GENERAL-
PURPOSE
OUTPUT
(GPO)
PIN
PWM
MARGIN
OUTPUT
(PWM)
GENERAL-
PURPOSE
OUTPUT
(GPO)
PIN
0 RS0 GPI0 5 PSEN0 GPO0 38 PWM0 GPO12 24
1 RS1 GPI1 4 PSEN1 GPO1 39 PWM1 GPO13 25
2 RS2 GPI2 3 PSEN2 GPO2 40 PWM2 GPO14 26
3 RS3 GPI3 2 PSEN3 GPO3 41 PWM3 GPO15 27
4 RS4 GPI4 1 PSEN4 GPO4 42 PWM4 GPO16 28
5 RS5 GPI5 56 PSEN5 GPO5 43 PWM5 GPO17 29
6 RS6 GPI6 55 PSEN6 GPO6 44 PWM6 GPO18 32
7 RS7 GPI7 54 PSEN7 GPO7 45 PWM7 GPO19 33
8 RS8 GPI8 53 PSEN8 GPO8 46
Margin capability provided through
theexternalDS4424
9 RS9 GPI9 52 PSEN9 GPO9 48
10 RS10 GPI10 51 PSEN10 GPO10 19
11 RS11 GPI11 50 PSEN11 GPO11 13
12 RS12 GPI12 49
CanmonitorvoltageorcurrentorbeassignedasGPI
13 RS13 GPI13 47
14 RS14 GPI14 20
15 RS15 GPI15 14