MAX16016PTBS+T Maxim Integrated Products, MAX16016PTBS+T Datasheet - Page 16

• Manufacturer Part Number: MAX16016PTBS+T
• Description: IC UP SUPERVISOR LP 10TDFN-EP
• Manufacturer: Maxim Integrated Products
• Type: Battery Backup Circuitr

Specifications of MAX16016PTBS+T

• Number Of Voltages Monitored: 1
• Output: Open Drain or Open Collector
• Reset: Active Low
• Reset Timeout: 145 ms Minimum
• Voltage - Threshold: 2.93V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TDFN Exposed Pad
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-Power µP Supervisory Circuits with
Battery-Backup Circuit and Chip-Enable Gating
To reenable the freshness seal:
1) Connect a battery to BATT.
2) Bring V
3) Drive MR higher than V
4) Pull OUT to 0V.
A µP’s reset input starts the µP in a known state. The
µP supervisory circuits assert a reset to prevent code-
execution errors during power-up, power-down, and
brownout conditions. Reset output is guaranteed to be
a logic-low or logic-high depending on the device cho-
sen. RESET or RESET asserts when V
reset threshold and remains asserted for at least 145ms
(t
or RESET also asserts when MR is low. The MAX16016
watchdog function causes RESET to assert in pulses
following a watchdog timeout. The reset output is avail-
able in both push-pull and open-drain configurations.
Figure 2. Monitoring an Additional Supply by Connecting PFO
to MR
16
RP
) after V
R1
R2
______________________________________________________________________________________
V
2
CC
CC
to 0V.
PFI
rises above the reset threshold. RESET
MAX16016L
MAX16020L
MAX16021L
GND
V
V
CC
1
BATT
ADDITIONAL SUPPLY RESET VOLTAGE
RESET
PFO
MR
0.1µF
V
+ 1.2V for at least 3µs.
2(RESET)
= V
PFT
Reset Output
RESET
CC
x
(—)
R1+R2
is below the
µP
R2
The MAX16016/MAX16020/MAX16021 offer an under-
voltage comparator that the output PFO goes low when
the voltage at PFI falls below its V
Common uses for the power-fail comparator include
monitoring the power supply (such as a battery) before
any voltage regulation to provide an early power-fail
warning, so software can conduct an orderly system
shutdown. The power-fail comparator has a typical
input hysteresis of V
making it independent of the reset circuit. Connect the
PFI input to GND if not used.
The MAX16016/MAX16020/MAX16021 µP supervisors
can monitor either positive or negative supplies using a
resistive voltage-divider to PFI. PFO can be used to
generate an interrupt to the µP or to trigger a reset
(Figures 2 and 3). To monitor a negative supply, con-
nect the top of the resistive divider to V
bottom of the resistive divider to the negative voltage to
be monitored.
Figure 3. Monitoring a Negative Supply
5V
PFO
R1
R2
V-
+5V
0
Monitoring an Additional Supply
PFI
Applications Information
PFT-HYS
MAX16016
MAX16020
MAX16021
GND
V
CC
Power-Fail Comparator
V
TRIP
and is powered from OUT,
PFO
0.1µF
PFT
V
TRIP
threshold.
V
= V
CC
TRIP
0V
PFT
. Connect the
IS NEGATIVE
-
—
R2
R1
(5 - V
V-
PFT
)