MAX16031ETM+ Maxim Integrated Products, MAX16031ETM+ Datasheet - Page 19

• Manufacturer Part Number: MAX16031ETM+
• Description: IC SYSTEM MON EEPROM 48-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Multi-Voltage Supervisorr

Specifications of MAX16031ETM+

• Number Of Voltages Monitored: 8
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: Adjustable/Selectable
• Voltage - Threshold: 8 Selectable Threshold Combinations
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFN Exposed Pad
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Supply Voltage (max): 14 V
• Supply Voltage (min): 2.9 V
• Supply Current (typ): 3000 uA
• Maximum Power Dissipation: 2222.2 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX16031 provides current-sense inputs CS+/CS-
and a current-sense amplifier for current monitoring
(see Figure 3). There are two programmable current-
sense thresholds: primary overcurrent and secondary
overcurrent. For fast fault detection, the primary over-
current threshold is implemented with an analog com-
parator connected to the OVERC output. The primary
threshold equation is:
where I
the threshold set by r19h[1:0], and R
Figure 3. Current-Sense Block Diagram
Table 4. Overcurrent Primary Threshold and Remote Temperature Sense Gain Trim
R
SENSE
REGISTER
ADDRESS
V
LOAD
MON
19h
4Fh
TH
OVERC
is the current threshold to be set, V
CS+
V
CS-
L
*ADJUSTABLE BY r19h [1:0]
______________________________________________________________________________________
I
ADDRESS
TH
MEMORY
EEPROM
CFh
MAX16031
99h
=
-
+
R
V
SENSE
CSTH
+
-
Current Monitoring
+
-
*V
EEPROM-Based System Monitors
SENSE
CSTH
BIT RANGE
with Nonvolatile Fault Memory
*A
[1:0]
[7:2]
[5:0]
[7:6]
V
is the value
TO ADC MUX
CSTH
Overcurrent Primary Threshold and Current-Sense Gain Setting:
00 = 200mV threshold, A V = 6V/V
01 = 100mV threshold, A V = 12V/V
10 = 50mV threshold, A V = 24V/V
11 = 25mV threshold, A V = 48V/V
Remote Temperature Sensor 1 Gain Trim. Note bit 6 is inverted.
Remote Temperature Sensor 1 Gain Trim
Not used
is
of the sense resistor. See Table 4 for a description of
r19h. The ADC output for a current-sense conversion is:
where X
V
by r19h[1:0], and V
(1.4V typical).
OVERC is latched when the primary overcurrent thresh-
old is exceeded by programming r5Ch[4]. The latch is
cleared by writing a ‘1’ to r53h[6]. OVERC depends
only on the primary overcurrent threshold. Other fault
outputs are programmed to depend on the secondary
overcurrent threshold. The secondary overcurrent
threshold is implemented through ADC conversions
and digital comparisons. The secondary overcurrent
threshold contains programmable time delay options
located in r5Ch[1:0]. Primary and secondary current-
sense faults are enabled/disabled through r1Bh[3].
The MAX16031 provides two sets of remote diode inputs,
DXP1/DXN1 and DXP2/DXN2, and one internal tempera-
ture sensor. The MAX16032 provides one set,
DXP1/DXN1, and one internal temperature sensor.
Calibration registers provide adjustments for gain and off-
set to accommodate different types of remote diodes.
The internal temperature sensor circuitry is factory
trimmed. In addition to offset/gain trimming, a program-
mable lowpass filter is provided. See Figure 4 for the
block diagram of the temperature sensor circuitry. The
remote diode is actually a diode-connected transistor.
See Application Notes AN1057 and AN1944 for informa-
tion on error budget and several transistor manufacturers.
CS+
- V
ADC
CS-
X
, A
ADC
is the 8-bit decimal ADC result, V
V
=
is the current-sense voltage gain set
DESCRIPTION
RBP
V
SENSE
V
is the reference voltage at RBP
Temperature Monitoring
RBP
×
A
V
×
(
2
8
−
1
)
SENSE
19
is