19-0870; Rev 1; 10/07
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
General Description
The MAX16031/MAX16032 EEPROM-configurable sys-
tem monitors feature an integrated 10-bit analog-to-
digital converter (ADC) designed to monitor voltages,
temperatures, and current in complex systems. These
EEPROM-configurable devices allow enormous flexibility
in selecting operating ranges, upper and lower limits,
fault output configuration, and operating modes with
the capability of storing these values within the device.
The MAX16031 monitors up to eight voltages, three
temperatures (one internal/two external remote temper-
ature diodes), and a single current. The MAX16032
monitors up to six voltages and two temperatures (one
internal/one remote temperature diode). Each of these
monitored parameters is muxed into the ADC and writ-
ten to its respective register that can be read back
through the SMBus™ and JTAG interface.
Measured values are compared to the user-config-
urable upper and lower limits. For voltage measure-
ments, there are two undervoltage and two overvoltage
limits. For current and temperature, there are two sets
of upper limits. Whenever the measured value is out-
side its limits, an alert signal is generated to notify the
processor. Independent outputs are available for over-
current, overtemperature, and undervoltage/overvolt-
age that are configured to assert on assigned
channels. There are also undedicated fault outputs that
are configured to offer a secondary limit for tempera-
ture, current, or voltage fault or provide a separate
overvoltage output.
During a major fault event, such as a system shutdown,
the MAX16031/MAX16032 automatically copy the inter-
nal ADC registers into the nonvolatile EEPROM registers
that then are read back for diagnostic purposes.
The MAX16031/MAX16032 offer additional GPIOs that
are used for voltage sequencing, additional fault out-
puts, a manual reset input, or read/write logic levels. A
separate current-sense amplifier with an independent
output allows for fast shutoff during overcurrent condi-
tions. The MAX16031/MAX16032 are available in a
7mm x 7mm TQFN package and are fully specified
from -40°C to +85°C.
Features
o
Supply Voltage Operating Range of 2.85V to 14V
o
Monitors Up to Eight Voltages (Single-Ended or
Pseudo-Differential) with 1% Accuracy
o
EEPROM-Configurable Limits
Two Undervoltage and Two Overvoltage
Two Overtemperature
Two Overcurrent
o
High-Side Current-Sense Amplifier with
Overcurrent Output (MAX16031 Only)
o
Monitors Up to Three Temperatures
(1 Internal/2 Remote)
o
Nonvolatile Fault Memory Stores Fault Conditions
for Later Retrieval
o
Two Additional Configurable Fault Outputs
o
Two Configurable GPIOs
o
SMBus/I
2
C-Compatible Interface with
ALERT
Output and Bus Timeout Function
o
JTAG Interface
o
7mm x 7mm, 48-Pin TQFN Package
MAX16031/MAX16032
Ordering Information
PART
MAX16031ETM+
MAX16032ETM+
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
T4877-6
T4877-6
-40°C to +85°C 48 TQFN-EP*
-40°C to +85°C 48 TQFN-EP*
+Denotes
a lead-free package.
*EP
= Exposed paddle.
Pin Configuration
N.C. (DXN2)
N.C. (DXP2)
N.C. (CS+)
N.C. (CS-)
DXN1
DXP1
N.C.
N.C.
N.C.
V
CC
38
V
CC
37
36 ABP
35 GND
34 DBP
33 TDO
32 N.C.
31 N.C.
30 N.C.
29 TDI
28 TCK
27 TMS
26 RESET
25 FAULT1
13
GND
14
GPIO1
15
GPIO2
16
RBP
17
SDA
18
SCL
19
A0
20
A1
21
ALERT
22
OVERT
23
N.C. (OVERC)
24
FAULT2
IN1
48
IN2 1
IN3 2
IN4 3
N.C. 4
N.C. 5
N.C. 6
N.C. 7
GND 8
47
46
45
44
43
42
41
40
39
+
MAX16031
MAX16032
Applications
Servers
Storage Systems
Telecom
Workstations
Networking
IN5 9
IN6 10
N.C. (IN7) 11
N.C. (IN8) 12
( ) MAX16031 ONLY
SMBus is a trademark of Intel Corp.
TQFN
(7mm x 7mm)
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
MAX16031/MAX16032
Selector Guide
PART
MAX16031ETM+
MAX16032ETM+
VOLTAGE MONITORS
SINGLE ENDED
8
6
DIFFERENTIAL
4
3
TEMPERATURE SENSORS
INT
1
1
EXT
2
1
CURRENT-
SENSE AMPS
1
—
FAULT
GPIOs
OUTPUTS
4
4
2
2
Typical Application Circuit
5V DC-DC
EN
1.5V
DC-DC
3.3V DC-DC
EN
12V BUS
2.5V DC-DC
EN
0.9V
LINEAR
1.8V DC-DC
EN
1.2V
DC-DC
5V
1.5V
3.3V
1.2V
2.5V
0.9V
1.8V
3.3V AUX
CS+
V
CC
1µF
CS-
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
ALERT
SCL
SDA
GPIO1
INT
SCL
SDA
RESET
µC
DXP1
RESET
SYSTEM RESET
MAX16031
DXN1
DXP2
FAULT1
FAULT2
OVERT
OVERC
TO FAN CONTROL
DXN2
ABP
1µF
1µF
DBP
2.2µF
RBP
GND
A0
A1
TMS
TCK
TDI
TDO
GPIO2
WARNING INDICATORS
TMS
SYSTEM JTAG
HEADER
TCK
TDI
TDO
MANUAL
RESET
SWITCH
TO OTHER
JTAG DEVICES
2
_______________________________________________________________________________________
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ............................................................-0.3V to +15V
IN_, FAULT_, SCL, SDA,
OVERT
to GND.................-0.3V to +6V
A0, A1, TCK, TMS, TDI to GND ................................-0.3V to +6V
OVERC, RESET,
GPIO_,
ALERT
to GND..................-0.3V to +6V
RBP, ABP, DBP to GND ...-0.3V to lower of (6V and V
CC
+ 0.3V)
TDO, DXP1, DXP2 to GND..........................-0.3V to V
DBP
+ 0.3V
CS+, CS- to GND ...................................................-0.3V to +30V
(CS+ - CS-) ............................................................................±5V
DXN1, DXN2 to GND.............................................-0.3V to +0.8V
SDA,
ALERT
Current ...........................................-1mA to +50mA
DXN1, DXN2 Current ............................................................1mA
Input/Output Current
(all except DXN1, DXN2, SDA, and
ALERT)
..................20mA
Continuous Power Dissipation (T
A
= +70°C)
48-Pin, 7mm x 7mm TQFN
(derate 27.8mW/°C above +70°C) ........................2222.2mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+250°C
MAX16031/MAX16032
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation 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.
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.9V to 14V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at V
CC
= 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Undervoltage Lockout
Undervoltage Lockout Hysteresis
Supply Current
ADC DC ACCURACY
Resolution
Total Unadjusted Error
Integral Nonlinearity
Differential Nonlinearity
ADC Total Monitoring Cycle Time
t
CYCLE
Eight supply inputs, three temperatures,
and current sense
Register map bit set to 00
(LSB = 5.46mV)
ADC IN_ Voltage Ranges
Register map bit set to 01
(LSB = 2.73mV)
Register map bit set to 10
(LSB = 1.36mV)
Reference Voltage
IN_ ANALOG INPUT
Absolute Input Voltage Range
(Referenced to GND)
Input Impedance
0
30
50
5.6
80
V
kΩ
V
RBP
1.306
T
A
= -40°C to +85°C
1
1
80
5.6
2.8
1.4
1.4
1.414
V
V
100
10
0.9
Bits
% FSR
LSB
LSB
µs
SYMBOL
V
CC
V
UVLO
V
UVLOHYS
I
CC
Static (EEPROM not accessed)
Minimum voltage at V
CC
to access the digital interfaces
100
3
5
CONDITIONS
MIN
2.90
TYP
MAX
14.00
2.8
UNITS
V
V
mV
mA
_______________________________________________________________________________________
3
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
MAX16031/MAX16032
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.9V to 14V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at V
CC
= 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Input Hysteresis
RESET OUTPUT
r20h[5:3] = 000; from
MR
going high
r20h[5:3]= 001
r20h[5:3]= 010
Reset Timeout Period
t
RP
r20h[5:3]= 011
r20h[5:3]= 100
r20h[5:3]= 101
r20h[5:3]= 110
r20h[5:3]= 111
TEMPERATURE MEASUREMENTS
Internal Sensor Measurement
Error
External Remote Diode
Temperature Measurement Error
Temperature Measurement
Resolution
Temperature Measurement Noise
External Diode Drive High
External Diode Drive Low
Diode Drive Current Ratio
DXN_ Impedance to GND
Power-Supply Rejection
CURRENT SENSE
CS+ Input Voltage Range
Input Bias Current
V
CS+
I
CS+
I
CS-
V
CS+
= V
CS-
V
CS-
= V
CS+
A = 48
Primary Current-Sense
Differential Thresholds
Primary Current-Sense Threshold
V
CSTH
V
CS+
- V
CS-
A = 24
A = 12
A=6
CS
HYS
Percent of V
CSTH
r5Ch[1:0] = 00
Secondary Overcurrent
Threshold Timeout
r5Ch[1:0] = 01
r5Ch[1:0] = 10
r5Ch[1:0] = 11
3.6
14.4
57.6
21.5
45
92
190
3
14
3
25
50
100
200
0.5
50
4
16
64
4.4
17.6
70.4
ms
28
25
8
28.5
55
108
210
%
µs
mV
V
µA
PSR
Internal sensor, DC condition
Internal sensor
(Note 2)
(Note 2)
±3
±5
0.5
0.1
84
6
14
1.8
0.1
kΩ
°C/V
°C
°C
°C
°C
µA
µA
22.5
2.25
9
36
144
576
1152
2304
25
2.5
10
40
160
640
1280
2560
27.5
2.75
11
44
176
704
1408
2816
ms
µs
SYMBOL
CONDITIONS
Percent of programmed
threshold
r5Ch[5] = 0
r5Ch[5] = 1
MIN
TYP
0.78
1.17
MAX
UNITS
%
4
_______________________________________________________________________________________
EEPROM-Based System Monitors
with Nonvolatile Fault Memory
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.9V to 14V, T
A
= -40°C to +85°C, unless otherwise specified. Typical values are at V
CC
= 3.3V, T
A
= +25°C.) (Note 1)
PARAMETER
Current-Sense Analog Input
Range
SYMBOL
CONDITIONS
A=6
V
CS+
- V
CS-
A = 12
A = 24
A = 48
V
SENSE
= 150mV, (A = 6 only)
ADC Current-Sense
Measurement Accuracy
V
SENSE
= 50mV, (A = 6, 12 only)
V
SENSE
= 25mV
V
SENSE
= 10mV
Gain Accuracy
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
OVERC
Output Leakage Current
OVERC
Output Low Voltage
OVERC
Propagation Delay
SMBus INTERFACE (SCL, SDA)
Logic-Input Low Voltage
Logic-Input High Voltage
Input Leakage Current
Output Low Voltage
Input Capacitance
ALERT, FAULT_,
and GPIO_
Output Low Voltage
ALERT, FAULT_,
and GPIO_
Leakage Current
GPIO_ (INPUT)
Logic-Low Voltage
Logic-High Voltage
SMBus ADDRESS (A0 and A1)
Address Logic-Low
Address Logic-High
High-Impedance Leakage
Current
Input Leakage Current
Maximum current to achieve high-
impedance logic level
0 to 3V, V
CC
= 3V
1.4
-1
-12
+1
+12
0.4
V
V
µA
µA
GPIO_ voltage falling
GPIO_ voltage rising
2.0
0.8
V
V
V
OL
C
IN
V
IL
V
IH
Input voltage falling
Input voltage rising
GND or 5.5V (V
CC
= 5.5V) V
SCL
, V
SDA
I
SINK
= 3mA
5
2.0
-1
+1
0.4
0.8
V
V
µA
V
pF
CMRR
CS
PSRR
CS
I
OVERCLKG
V
OLOVERC
t
OVERC
I
OUT
= 3mA
V
SENSE
- V
CSTH
> 10% x V
CSTH
V
SENSE
= 20mV to 100mV,
V
CS+
= 12V, A = 6
V
CS+
> 4V
-3
80
80
1
0.4
5
-4
-10
MIN
TYP
232
116
58
29
±0.2
±1.2
±2
±10
+3
%
dB
dB
µA
V
µs
+4
+10
%
MAX
UNITS
MAX16031/MAX16032
mV
ALERT, FAULT_,
AND GPIO_ OUTPUTS
I
SINK
= 3mA
V
ALERT
, V
FAULT
, V
GPIO_
= 5.5V or GND
-1
0.4
+1
V
µA
_______________________________________________________________________________________
5
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