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AS1910Z-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 7 - 16
AS1910 - AS1915
Datasheet - Typical Operating Characteristics
7 Typical Operating Characteristics
TAMB = +25ºC (unless otherwise specified).
Figure 3. Normalized Reset Threshold Delay vs. Figure 4. V
OUT vs. VCC; VCC2 = 2.50V, VTH = 1.58V
Temperature Active-Low (Typ)
Figure 5. Reset Timeout Period vs. Temperature Figure 6. Supply Current vs. Temperature
Figure 7. V
OH vs. ISOURCE; VCC = 3.2V Figure 8. VOL vs. ISINK; VCC = 3.2V
-0.50
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
5.50
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
V
CC
(V)
Output Voltage (V) e
0.94
0.96
0.98
1
1.02
1.04
1.06
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Reset Threshold (V) e
3
4
5
6
7
8
9
10
-50 -25 0 25 50 75 100 125
Temperature (°C)
V
CC
Supply Current (µA) e
VCC = 3.08V T Version
VCC = 1.58V V Version
150
160
170
180
190
200
210
220
230
240
250
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Reset Timeout Periode (ms)
2.9
2.95
3
3.05
3.1
3.15
3.2
3.25
0 0.2 0.4 0.6 0.8 1 1.2
I
SOURCE
(mA)
V
OUT
(V) ]
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
01234567
I
SINK
(mA)
V
OUT
(V) e
www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 8 - 16
AS1910 - AS1915
Datasheet - Detailed Description
8 Detailed Description
The AS1910 - AS1915 supervisory circuits were designed to generate a reset when one of the two monitored supply voltages falls below its
factory-trimmed trip threshold (see VTH on page 4 and VTH2 on page 4), and to maintain the reset for a minimum timeout period (see tRP on
page 5) after all supplies have stabilized.
The integrated watchdog timer (see Watchdog Input on page 10) helps mitigate against bad programming code or clock signals, and/or poor
peripheral response. An active-low manual reset input (see Manual Reset Input on page 10) allows for an externally activated system reset.
8.1 RESET/RESETN
Whenever one of the monitored voltages falls below its reset threshold, the RESET output (AS1910, AS1912, AS1913, AS1915) asserts low or
the RESETN output (AS1911, AS1914) asserts high. Once all monitored voltages have stabilized, an internal timer keeps the reset asserted for
the reset timeout period (t
RP). After the tRP period, the RESET or RESETN output return to their original state (see Figure 10).
Figure 9. Functional Diagram of V
CC Supervisory Application
Figure 10. Reset Timing Diagram
AS1913/AS1914/AS1915
Reset Timeout Delay
Generator
Watchdog Transition
Detector
Watchdog
Timer
+
–
1.26V
VCC
0.63V
1.26V
5
VCC2
2
GND
6
VCC
4
WDI
1
RESETN/
RESET
3
MRN
1V
t
RD
tRP
tRP
tRD
VTHVTH
VCC
RESETN
RESET
GND
1V
www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 9 - 16
AS1910 - AS1915
Datasheet - Detailed Description
Figure 11. Functional Diagram of RESETIN Supervisory Application
8.2 RESETIN
The AS1910/AS1911/AS1912 feature a user-adjustable supervisory voltage input (RESETIN). The threshold voltage for RESETIN is between
0.61 and 0.65V (0.63 typ).
Figure 12. Voltage Monitoring Circuit
To monitor a voltage higher than 0.63V, connect a resistor divider network to the circuit as shown in Figure 12. For the circuit shown in Figure 12,
the threshold at V
MONITOR is:
V
MONITOR_TRIP = 0.63V [(R1 + R2)/R2](EQ 1)
Note: Since RESETIN is powered by V
CC, VRESETIN must not be larger than VCC.
AS1910/AS1911/AS1912
Reset Timeout Delay
Generator
Watchdog Transition
Detector
Watchdog
Timer
VCC
0.63V
+
–
1.26V
2
GND
1
RESETN/
RESET
5
RESETIN
6
VCC
4
WDI
3
MRN
AS1910/AS1911/
AS1912
R1
R2
VMONITOR
VCC ≥ VRESETIN
5
RESETIN
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

AS1910Z-T

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Buy AS1910Z-T
Manufacturer:
ams
Description:
Supervisory Circuits
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