X40030 Datasheet, PDF (1/21 Pages) Intersil Corporation – Triple Voltage Monitor with Intergrated CPU Supervisor

®
PRELIMINARY
Data Sheet
X40030, X40031, X40034, X40035
April 28, 2005
FN8114.0
Triple Voltage Monitor with Integrated
CPU Supervisor
FEATURES
• Triple voltage detection and reset assertion
—Standard reset threshold settings
See selection table on page 2.
—Adjust low voltage reset threshold voltages
using special programming sequence
—Reset signal valid to V_CC = 1V
—Monitor three seperate voltages
• Fault detection register
• Selectable power on reset timeout
(0.05s, 0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval
(25ms, 200ms, 1.4s or off)
• Debounced manual reset input
• Low power CMOS
—25µA typical standby current, watchdog on
—6µA typical standby current, watchdog off
• 400kHz 2-wire interface
• 2.7V to 5.5V power supply operation
• Available packages
—14-lead SOIC, TSSOP
• Monitor Voltages: 5V to 0.9V
• Independent Core Voltage Monitor
APPLICATIONS
• Communication Equipment
—Routers, Hubs, Switches
—Disk arrays, Network Storage
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
— Computers
—Network Servers
DESCRIPTION
The X40030, X40031, X40034, X40035 combines
power-on reset control, watchdog timer, supply voltage
supervision, second and third voltage supervision, and
manual reset, in one package. This combination lowers
system cost, reduces board space requirements, and
increases reliability.
Applying voltage to V_CC activates the power on reset
circuit which holds RESET/RESET active for a period of
time. This allows the power supply and system oscilla-
tor to stabilize before the processor can execute code.
Low V_CC detection circuitry protects the user’s system
from low voltage conditions, resetting the system
when V_CC falls below the minimum V_TRIP1 point.
RESET/RESET is active until V_CC returns to proper
operating level and stabilizes. A second and third volt-
age monitor circuit tracks the unregulated supply to
provide a power fail warning or monitors different
power supply voltage. Three common low voltage
combinations are available, however, Intersil’s unique
circuits allows the threshold for either voltage monitor
to be reprogrammed to meet specific system level
requirements or to fine-tune the threshold for applica-
BLOCK DIAGRAM
V3MON
V2MON
+
V3 Monitor
Logic
-
V2 Monitor
Logic
V_TRIP3
V_CC or
V2MON*
+
V_TRIP2
-
V3FAIL
V2FAIL
SDA
WP
SCL
V_CC
(V1MON)
Data
Register
Command
Decode Test
& Control
Logic
Fault Detection
Register
Status
Register
V_{CCLMogoicnitor}
+
V_TRIP1
-
Watchdog
and
Reset Logic
Power on,
Manual Reset
Low Voltage
Reset
Generation
WDO
MR
RESET
X40030/34
RESET
X40031/35
LOWLINE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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