19-5879; Rev 0; 5/11
EVALUATION KIT AVAILABLE
MAX34446
PMBus Power-Supply Data Logger
General Description
The MAX34446 data logger for power supplies can
monitor voltages for overvoltage and undervoltage, as
well as for overcurrent conditions and overtemperature
conditions. The device constantly checks for user-
programmable thresholds; when these thresholds are
exceeded, the device logs the recent real-time operating
conditions in nonvolatile flash memory. The device can
monitor up to four voltages or currents, and can monitor
three temperature sensors. See the
Typical Application
Circuit/Block Diagram
for more details.
Features
S Voltage,Current,andTemperatureMeasurement
andThresholdExcursionDetection
S SupportsUptoFourVoltageorCurrent
Measurements
S SupportsUptoThreeTemperatureSensors:Two
RemoteDiodesPlusanInternalSensor
S CalculatesPowerConsumption
S Differential12-BitADC
S PMBus™-CompliantControlInterface
S Power-GoodOutputs
S IndividualFaultOutputs
S On-BoardNonvolatileFaultLoggingandDefault
ConfigurationSetting
S I
2
C/SMBus-CompatibleSerialBuswithBus
TimeoutFunction
S NoExternalClockingRequired
S 2.7Vto5.5VSupplyVoltage
S LowPowerConsumption
S -40NCto+105NCTemperatureRange
S 40-PinTQFN(6mmx6mm)Package
Applications
Base Stations
Industrial Controls
Network Switches/Routers
Servers
Smart Grid Network Systems
Ordering Information
appears at end of data sheet.
Typical Application Circuit/Block Diagram
appears at end
of data sheet.
PMBus is a trademark of SMIF, Inc.
For related parts and recommended products to use with this part, refer to:
www.maxim-ic.com/MAX34446.related
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Integrated Products
1
½
Forpricing,delivery,andorderinginformation,pleasecontactMaximDirectat1-888-629-4642,
orvisitMaxim’swebsiteatwww.maxim-ic.com.
MAX34446
PMBus Power-Supply Data Logger
ABSOLUTEMAXIMUMRATINGS
V
DD
to V
SS
...........................................................-0.3V to +5.5V
RS-[5:0] to V
SS
.....................................................-0.3V to +0.3V
All other pins except REG18 and
REG25 relative to V
SS
......................... -0.3V to (V
DD
+ 0.3V)*
*Subject
to not exceeding +5.5V.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Operating Temperature Range ........................ -40NC to +105NC
Storage Temperature Range............................ -55NC to +125NC
Lead Temperature (soldering, 10s) ................................+260NC
Soldering Temperature (reflow) ......................................+260NC
RECOMMENDEDOPERATINGCONDITIONS
(T
A
= -40NC to +105NC, unless otherwise noted.)
PARAMETER
V
DD
Operating Voltage
Input Logic-High
Input Logic-Low
Input Logic-High: SCL, SDA
Input Logic-Low: SCL, SDA
SYMBOL
V
DD
V
IH
V
IL
V
I2C_IH
V
I2C_IL
2.7V
P
V
DD
P
3.6V (Note 1)
2.7V
P
V
DD
P
3.6V (Note 1)
(Note 1)
CONDITIONS
MIN
2.7
0.7 x
V
DD
-0.3
2.1
-0.3
TYP
MAX
5.5
V
DD
+
0.3
0.3 x
V
DD
V
DD
+
0.3
+0.8
UNITS
V
V
V
V
V
DCELECTRICALCHARACTERISTICS
(V
DD
= 2.7V to 5.5V, T
A
= -40NC to +105NC, unless otherwise noted. Typical values are at V
DD
= 3.3V, T
A
= +25NC.)
PARAMETER
Supply Current
Brownout Voltage
Brownout Hysteresis
Internal System Clock
System Clock Error (Note 3)
Output Logic-Low
Output Logic-High
Pullup Current
SYMBOL
I
CPU
I
PROGRAM
V
BO
V
BOH
f
MOSC
+25NC
P
T
A
P
+85NC
f
ERR:MOSC
-40NC
P
T
A
P
+25NC
-20NC
P
T
A
P
+105NC
V
OL1
V
OH1
I
PU
I
OL
= 4mA (Note 1)
I
OH
= -2mA (Note 1)
V
PIN
= V
SS
, V
DD
= 3.3V
V
DD
-
0.5
38
55
107
-3
-6.5
-4
Monitors V
DD
(Note 1)
Monitors V
DD
(Note 1)
2.40
(Note 2)
CONDITIONS
MIN
TYP
3.0
8
2.46
30
4.0
+2
+1.6
+2.5
0.4
V
V
FA
%
2.55
MAX
UNITS
mA
V
mV
MHz
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Integrated Products
2
½
MAX34446
PMBus Power-Supply Data Logger
DCELECTRICALCHARACTERISTICS(continued)
(V
DD
= 2.7V to 5.5V, T
A
= -40NC to +105NC, unless otherwise noted. Typical values are at V
DD
= 3.3V, T
A
= +25NC.)
PARAMETER
ADC Full-Scale Voltage
ADC Full-Scale Temperature Drift
ADC Measurement Resolution
ADC Bit Resolution
RS+ Input Resistance
ADC Integral Nonlinearity
ADC Differential Nonlinearity
ADC Offset
Internal Temperature
Measurement Error
R
IN
INL
DNL
V
OFFSET
T
A
= -40NC to +85NC
T
A
= -40NC to +105NC
T
A
= 0NC to +60NC,
T
DIODE
= +60NC to +120NC
T
A
= 0NC to +60NC,
T
DIODE
= -45NC to +120NC
T
A
= -40NC to +105NC,
T
DIODE
= -45NC to +120NC
-3
-3.5
-1.5
-1.75
-3.5
20
40
50
37
12
750
N
FLASH
T
A
= +50NC
T
A
= +50NC
Per temperature sensor
Measurement from POR until monitoring
begins
20,000
100
500
1000
12
Q2
+3
+3.5
+1.5
+1.75
+3.5
500
60
kHz
%
ms
ms
ms
Write
Cycles
Years
Fs
ms
ms
NC
V
LSB
12
15
Q4
Q1
SYMBOL
T
A
=
+25NC
T
A
= -40NC to +105NC
CONDITIONS
MIN
1.22
-0.6
300
TYP
1.225
MAX
1.23
+0.6
UNITS
V
%
FV
Bits
MI
LSB
LSB
LSB
NC
Remote Temperature
Measurement Error
(MAX3446 Error Only)
SYNC Frequency Range
SYNC Duty Cycle
Store Default All Time
Nonvolatile Log Write Time
Nonvolatile Log Delete Time
Flash Endurance
Data Retention
Current or Voltage Sample Rate
Temperature Sample Rate
Device Startup Time
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Integrated Products
3
½
MAX34446
PMBus Power-Supply Data Logger
I
2
C/SMBusINTERFACEELECTRICALCHARACTERISTICS
(V
DD
= 2.7V to 5.5V, T
A
= -40NC to +105NC, unless otherwise noted. Typical values are at V
DD
= 3.3V, T
A
= +25NC.)
PARAMETER
SCL Clock Frequency
Bus Free Time Between STOP
and START Conditions
Hold Time (Repeated) START
Condition
Low Period of SCL
High Period of SCL
Data Hold Time
Data Setup Time
START Setup Time
SDA and SCL Rise Time
SDA and SCL Fall Time
STOP Setup Time
Clock Low Timeout
SYMBOL
f
SCL
t
BUF
t
HD:STA
t
LOW
t
HIGH
t
HD:DAT
t
SU:DAT
t
SU:STA
t
R
t
F
t
SU:STO
t
TO
4.0
25
35
Receive
Transmit
CONDITIONS
MIN
10
4.7
4.0
4.7
4.0
0
300
100
4.7
300
300
TYP
MAX
100
UNITS
kHz
Fs
Fs
Fs
Fs
ns
ns
Fs
ns
ns
Fs
ms
Note1:
All voltages are referenced to ground (V
SS
). Currents entering the device are specified as positive, and currents exiting
the device are specified as negative.
Note2:
This does not include pin input/output currents.
Note3:
Guaranteed by design; not production tested.
I
2
C/SMBus Timing
SDA
t
BUF
t
LOW
SCL
t
HIGH
t
HD:DAT
STOP
START
t
SU:DAT
REPEATED
START
t
F
t
HD:STA
t
SP
t
HD:STA
t
R
t
SU:STA
t
SU:STO
NOTE:
TIMING IS REFERENCED TO V
IL(MAX)
AND V
IH(MIN)
.
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Integrated Products
4
½
MAX34446
PMBus Power-Supply Data Logger
Typical Operating Characteristics
(V
DD
= 2.7V to 5.5V, T
A
= -40NC to +105NC, unless otherwise noted. Typical values are at V
DD
= 3.3V, T
A
= +25NC.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX34446 toc01
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
3.8
3.6
3.4
I
DD
(mA)
3.2
3.0
2.8
2.6
2.4
2.2
2.0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
V
DD
(V)
MAX34446 toc02
4.0
3.8
3.6
3.4
I
DD
(mA)
3.2
3.0
2.8
2.6
2.4
2.2
2.0
-40
-20
0
20
40
60
80
4.0
T
A
= +25°C
V
DD
= 3.3V
100 120
TEMPERATURE (°C)
I
DD
vs. TIME DURING A NONVOLATILE
LOG WRITE DUE TO LOG PIN
(V
DD
= 3.3V, ALL CHANNELS ENABLED,
SYNC PIN ACTIVE AT 100kHz)
5V/div
0V
LOG
MAX34446 toc03
I
DD
vs. TIME DURING A NONVOLATILE
MFR_TIME_COUNT WRITE DUE TO ENABLE PIN
(V
DD
= 3.3V, ALL CHANNELS ENABLED,
SYNC PIN ACTIVE AT 100kHz)
MAX34446 toc04
2V/div
0V
2V/div
0V
ENABLE PIN
1mA/div
0mA
I
DD
FAULT6
1mA/div
0mA
I
DD
2ms/div
2ms/div
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Integrated Products
5
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