LTC2932_15 Datasheet, PDF (1/16 Pages) Linear Technology – Confi gurable Six Supply Monitor with Adjustable Reset Timer and Supply Tolerance

LTC2932
FEATURES
Configurable Six Supply
Monitor with Adjustable Reset
Timer and Supply Tolerance
DESCRIPTION
■ _{Simultaneously Monitors Six Supplies}
■ _{16 User Selectable Combinations of}
5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and
± Adjustable Voltage Thresholds
■ _{Guaranteed Threshold Accuracy: ±1.5%}
■ _{Selectable Supply Tolerances: 5%, 7.5%, 10%,}
12.5% Below Monitored Voltage
■ _{Reset Disable Pin for Margining Applications}
■ _{Low Supply Current: 52μA}
■ _{Power Supply Glitch Immunity}
■ _{Guaranteed RST for VCC ≥ 1V}
■ _{High Temperature Operation to 125°C}
■ _{20-Lead TSSOP Package}
APPLICATIONS
■ _{Desktop and Notebook Computers}
■ _{Multivoltage Systems}
■ _{Telecom Equipment}
■ _{Portable Battery-Powered Equipment}
■ _{Network Servers}
■ _Automotive
The LTC^®2932 is a configurable supply monitor for sys-
tems 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 digitally
configurable to 5%, 7.5%, 10%, or 12.5% below the
nominal operating voltage. The LTC2932 also features
adjustable inputs with a 0.5V nominal threshold. All six
open-drain voltage comparator outputs are connected to
separate pins for individual supply monitoring.
The reset timeout period is adjustable using an external
capacitor. The RST output is guaranteed to be in the
correct state for V_CC down to 1V and may be disabled
during supply margin testing. Each status output has a
weak internal pull-up and may be externally pulled up to
an external voltage.
The 52μA supply current makes the LTC2932 ideal for
power conscious systems and the part may be configured
to monitor less 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 12V (ADJ),
5V, 3.3V, 2.5V, 1.8V, 1.2V (ADJ)
12V
5V
3.3V
SYSTEM
2.5V
LOGIC
1.8V
1.2V
10k
2150k 124k
1% 1%
V1
POWER
GOOD
V2
0.1μF
0.1μF
100k 100k
1% 1% _R1
59k
1%
R2
40.2k
1%
V3
V4
V5
V6
VREF
VPG
GND
LTC2932
T0 T1
RDIS
RST
2932 TA01
t_RST = 94ms
CRT
C_RT
47nF
Voltage Threshold Configuration Table
V1 (V) V2 (V) V3 (V) V4 (V) V5 (V) V6 (V)
5
3.3
2.5
1.8
ADJ
ADJ
5
3.3
2.5
1.5
ADJ
ADJ
5
3.3
2.5
ADJ ADJ ADJ
5
3.3
1.8
ADJ ADJ ADJ
5
3.3
1.8 –ADJ ADJ ADJ
5
3.3
ADJ ADJ ADJ
ADJ
5
3.3
ADJ –ADJ ADJ
ADJ
5
3
2.5
ADJ ADJ
ADJ
5
3
1.8
ADJ ADJ
ADJ
5
3
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
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