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AS1910Z-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
AS1910 - AS1915
Dual-Voltage Microprocessor Supervisory Circuits with Manual Reset
and Watchdog
www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 1 - 16
Datasheet
1 General Description
The AS1910 - AS1915 microprocessor supervisory circuits were
designed to generate a reset when one of the two monitored supply
voltages falls below a factory-trimmed threshold, and to maintain the
reset for a minimum timeout period when both supplies are above
their reset thresholds. Guaranteed to be in the correct state for V
CC
higher than +1.0V, these devices are ideal for multiple-voltage
systems with strict monitoring requirements.
The AS1913/AS1914/AS1915 feature factory-trimmed thresholds to
monitor a primary voltage between 1.8 and 3.6V, and a secondary
voltage between 0.9 and 2.5V.
For the AS1910/AS1911/AS1912, a secondary monitoring voltage
can be user-adjusted via an external resistor divider down to 0.6V.
The devices are available with the reset output types listed in Table
1.
The AS1910 - AS1915 include a manual-reset input for systems that
never fully power down the microprocessor. Additionally, these
devices feature a watchdog timer to help ensure that the processor is
operating within proper code boundaries.
The AS1910 - AS1915 are available in a 6-pin SOT23 package.
Figure 1. Typical Application Diagram
2 Key Features
Primary VCC Supervisory Range: +1.8 to +3.6V
Secondary VCC Supervisory Range: +0.9 to +2.5V (AS1913/
AS1914/AS1915)
User-Adjustable Threshold Down to +0.63V (AS1910/AS1911/
AS1912)
Guaranteed Reset Valid Down to VCC = +1.0V
Reset Timeout Delay: 215ms
Manual Reset Input
Three Reset Output Types:
- Active-High Push/Pull
- Active-Low Push/Pull
- Active-Low Open-Drain
Watchdog Timeout Period: 1.5s
Immune to Fast Negative VCC Transients
External Components Not Required
Operating Temperature Range: -40 to +125ºC
6-pin SOT23 Package
3 Applications
The devices are ideal for portable and battery-powered systems,
embedded controllers, intelligent instruments, automotive systems,
critical CPU monitoring, and any multi-supply application.
Table 1. Standard Products
Model Reset Output Type
AS1910/AS1913 Active-Low Push/Pull
AS1911/AS1914 Active-High Push/Pull
AS1912/AS1915 Active-Low Open-Drain
External
Reset
CPU
Core
Supply
I/O Supply
VCC
VCC2
GND
RESETN
I/O
4
WDI
6
VCC
3
MRN
GND 2
1
RESETN
5
VCC2
AS1913/
AS1915
www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 2 - 16
AS1910 - AS1915
Datasheet - Pin Assignments
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
4.1 Pin Descriptions
Table 2. Pin Descriptions
Pin Number Pin Name Description
1
RESETN
Active-Low Reset Output (AS1910, AS1912, AS1913, AS1915). The RESETN signal toggles from high to low
when V
CC, VCC2, or RESETIN input drops below the factory-trimmed reset threshold (see Table 4 on page 4),
or MRN is pulled low, or the watchdog triggers a reset. This output signal remains low for the reset timeout period
after all supervised voltages exceed their reset threshold, or MRN goes low to high, or the watchdog triggers a
reset.
RESET
Active-High Reset Output (AS1911, AS1914). The RESET signal toggles from low to high when V
CC, VCC2, or
RESETIN input drops below the factory-trimmed reset threshold (see Table 4 on page 4), or MRN is pulled low,
or the watchdog triggers a reset. This output signal remains high for the reset timeout period (see tRP on page 5)
after all supervised voltages exceed their reset threshold, or MRN goes low to high, or the watchdog triggers a
reset.
2GND
Ground
3MRN
Active-Low Manual Reset Input. Pulling this pin low asserts a reset. This pin is connected to the internal 50kΩ
pullup to V
CC. This reset remains active as long as MRN is low and for the reset timeout period (see tRP on
page 5) after MRN goes high.
Note: If the manual reset feature is not used, this pin should be unconnected or connected to V
CC.
4WDI
Watchdog Input. If WDI remains high or low for longer than the watchdog timeout period (see t
WD on page 6),
the internal watchdog timer period expires and a reset is triggered for the reset timeout period (see t
RP on page
5). The internal watchdog timer clears whenever a reset is a asserted or when WDI senses a rising or falling
edge.
Note: To disable the watchdog feature, this pin must be unconnected or connected to a tri-state buffer output.
WDI must be low or unconnected (tristate) during the reset timeout period tRP, (see Figure 13 on page 10).
5
RESETIN
User-Adjustable Supervised Voltage Input (AS1910/AS1911/AS1912). This high-impedance pin serves as the
input to the internal reset comparator. Connect this pin to an external resistor-divider network to set the reset
threshold voltage (down to 0.63V).
VCC2
Primary Supervised Voltage Input (AS1913/AS1914/AS1915). This pin serves as the secondary supervised
voltage input.
6VCC
Primary Supervised Voltage Input. This pin serves as the primary supervised voltage input.
AS1910 -
AS1915
2
GND
3
MRN
1
RESETN/RESET
4
WDI
5
RESETIN/VCC2
6
VCC
www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 3 - 16
AS1910 - AS1915
Datasheet - Absolute Maximum Ratings
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 3 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 Electrical Characteristics on page 4 is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Table 3. Absolute Maximum Ratings
Parameter Min Max Units Comments
Electrical Parameters
VCC, VCC2 to GND -0.3 +5.0 V
Open-Drain RESETN -0.3 +7.0 V
Push/Pull RESET, RESETN -0.3
V
CC +
0.3
V
MRN, WDI, RESETIN to GND -0.3
V
CC +
0.3
V
Input Current (V
CC)20mA
Output Current (RESET, RESETN) 20 mA
Continuous Power Dissipation
Continuous Power Dissipation
(T
AMB = +70ºC)
696 mW Derate 8.7mW/ºC above +70ºC
Temperature Ranges and Storage Conditions
Junction Temperature +150 ºC
Storage Temperature Range -55 +150 ºC
Package Body Temperature
+260 ºC
The reflow peak soldering temperature (body temperature)
specified is in accordance with IPC/JEDEC J-STD-020
“Moisture/Reflow Sensitivity Classification for Non-
Hermetic Solid State Surface Mount Devices”.
The lead finish for Pb-free leaded packages is matte tin
(100% Sn).
Humidity non-condensing
885%
Moisture Sensitive Level
1 Represents a max. floor life time of unlimited
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

AS1910Z-T

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ams
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Supervisory Circuits
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