LTC2930 Datasheet, PDF (1/12 Pages) Linear Technology – Confi gurable Six Supply Monitor with Adjustable Reset Timer, Manual Reset

FEATURES
■ _{Simultaneously Monitors Six Supplies}
■ _{16 User Selectable Combinations of}
5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and
± Adjustable Voltage Thresholds
■ _{Guaranteed ±1.5% Threshold Accuracy}
■ _{Adjustable Reset Timeout}
■ _{Low Supply Current: 52μA}
■ _{Manual Reset Pin}
■ _{Power Supply Glitch Immunity}
■ _{Guaranteed RST for VCC ≥ 1V}
■ _{High Temperature Operation to 125°C}
■ _{12-Lead 3mm × 3mm DFN Package}
APPLICATIONS
■ _{Desktop and Notebook Computers}
■ _{Multivoltage Systems}
■ _{Telecom Equipment}
■ _{Portable Battery-Powered Equipment}
■ _{Network Servers}
■ _Automotive
LTC2930
Configurable Six Supply
Monitor with Adjustable
Reset Timer, Manual Reset
DESCRIPTION
The LTC^®2930 is a configurable supply monitor for
systems with up to six supply voltages. One of 16 preset or
adjustable voltage monitor combinations can be selected
using an external resistive divider connected to the mode
select pin. The preset voltage thresholds are accurate
to ±1.5% over temperature. The LTC2930 also features
adjustable inputs with a 0.5V nominal threshold.
The reset timeout period is adjustable using an external
capacitor. A reset event may be generated with a manual
reset button on the manual reset input. Tight voltage
threshold accuracy and glitch immunity ensure reliable
reset operation without false triggering. The RST output
is guaranteed to be in the correct state for V_CC down to 1V
and may be externally pulled up to an external voltage.
The 52μA supply current makes the LTC2930 ideal for
power conscious systems and it may be configured to
monitor fewer than six inputs.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6967591, 7119714, 7239251.
TYPICAL APPLICATION
Six Supply Monitor, 5% Threshold
12V, 5V, 3.3V, 1.8V, 1.2V, –5.2V
12V
5V
3.3V
1.8V
1.2V
–5.2V
0.1μF
2150k 487k
1% 1%
124k
1%
121k
1%
100k 100k 16.2k
1% 1% 1%
V1
V2
V3
V4
LTC2930
V5
V6
VREF
VPG
GND
86.6k
1%
SYSTEM
LOGIC
RST
MR
CRT
C_RT
47nF
MANUAL RESET
t_RST = 94ms
2930 TA01
Voltage Threshold Configuration Table
V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V)
5.0
3.3
2.5
1.8
ADJ ADJ
5.0
3.3
2.5
1.5
ADJ ADJ
5.0
3.3
2.5
ADJ ADJ ADJ
5.0
3.3
1.8
ADJ ADJ ADJ
5.0
3.3
1.8 –ADJ ADJ ADJ
5.0
3.3
ADJ
ADJ ADJ ADJ
5.0
3.3
ADJ –ADJ ADJ ADJ
5.0
3.0
2.5
ADJ ADJ ADJ
5.0
3.0
1.8
ADJ ADJ ADJ
5.0
3.0
ADJ
ADJ ADJ ADJ
3.3
2.5
1.8
1.5
ADJ ADJ
3.3
2.5
1.8
ADJ ADJ ADJ
3.3
2.5
1.8 –ADJ ADJ ADJ
3.3
2.5
1.5
ADJ ADJ ADJ
3.3
2.5
ADJ
ADJ ADJ ADJ
3.3
2.5
ADJ –ADJ ADJ ADJ
2930fa
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