Data Sheet
AS1910 - AS1915
Dual-Voltage Microprocessor Supervisory Circuits
with Manual Reset and Watchdog
1 General Description
2 Key Features
ꢀ
Primary VCC Supervisory Range: +1.8 to +3.6V
The AS1910 - AS1915 microprocessor supervisory cir-
cuits 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 mini-
mum timeout period when both supplies are above their
reset thresholds. Guaranteed to be in the correct state
for VCC higher than +1.0V, these devices are ideal for
multiple-voltage systems with strict monitoring require-
ments.
ꢀ
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
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 monitor-
ing voltage can be user-adjusted via an external resistor
divider down to 0.6V.
Three Reset Output Types
- Active-High Push/Pull
- Active-Low Push/Pull
- Active-Low Open-Drain
The devices are available with the reset output types
listed in Table 1.
Table 1. Standard Products
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
Watchdog Timeout Period: 1.5s
Model
Reset Output Type
Active-Low Push/Pull
Active-High Push/Pull
Active-Low Open-Drain
Immune to Fast Negative VCC Transients
External Components Not Required
Operating Temperature Range: -40 to +125°C
6-pin SOT23 Package
AS1910/AS1913
AS1911/AS1914
AS1912/AS1915
The AS1910 - AS1915 include a manual-reset input for
systems that never fully power down the microproces-
sor. Additionally, these devices feature a watchdog timer
to help ensure that the processor is operating within
proper code boundaries.
3 Applications
The AS1910 - AS1915 are available in a 6-pin SOT23
package.
The devices are ideal for portable and battery-powered
systems, embedded controllers, intelligent instruments,
automotive systems, critical CPU monitoring, and any
multi-supply application.
Figure 1. Typical Application Diagram
I/O Supply
6
VCC
VCC
Core
Supply
5
AS1913/
AS1915
1
CPU
VCC2
RESETN
RESETN
VCC2
3
4
GND
External
Reset
I/O
MRN
WDI
GND
2
www.austriamicrosystems.com
Revision 1.00
1 - 15
AMSCO [ AMS(艾迈斯) ]
