CPU Supervisor. X40015 Datasheet

X40015 Datasheet PDF, Equivalent


Part Number

X40015

Description

Dual Voltage Monitor with Integrated CPU Supervisor

Manufacture

Xicor

Total Page 25 Pages
PDF Download
Download X40015 Datasheet PDF


X40015 Datasheet
New Features
• Monitor Voltages: 5V to 0.9V
• Independent Core Voltage Monitor
Preliminary Datasheet
X40010/X40011/X40014/X40015
Dual Voltage Monitor with Integrated CPU Supervisor
FEATURES
• Dual 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 VCC = 1V
—Monitor three voltages or detect power fail
• Independent Core Voltage Monitor (V2MON)
• Fault detection register
• Selectable power on reset timeout (0.05s,
0.2s, 0.4s, 0.8s)
• Selectable watchdog timer interval (25ms, 200ms,
1.4s, off)
• 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
—8-lead SOIC, TSSOP
APPLICATIONS
• Communication Equipment
—Routers, Hubs, Switches
—Disk Arrays, Network Storage
• Industrial Systems
—Process Control
—Intelligent Instrumentation
• Computer Systems
— Computers
—Network Servers
DESCRIPTION
The X40010/11/14/15 combines power-on reset con-
trol, watchdog timer, supply voltage supervision, and
secondary voltage supervision, in one package. This
combination lowers system cost, reduces board space
requirements, and increases reliability.
Applying voltage to VCC activates the power on reset
circuit which holds RESET/RESET active for a period of
time. This allows the power supply and system oscillator
to stabilize before the processor can execute code.
Low VCC detection circuitry protects the user’s system
from low voltage conditions, resetting the system when
VCC falls below the minimum VTRIP1 point. RESET/
RESET is active until VCC returns to proper operating
level and stabilizes. A second voltage monitor circuit
tracks the unregulated supply to provide a power fail
warning or monitors different power supply voltage.
Three common low voltage combinations are avail-
able, however, Xicor’s unique circuits allows the
BLOCK DIAGRAM
SDA
SCL
VCC
(V1MON)
V2MON
Data
Register
Command
Decode Test
& Control
Logic
Threshold
Reset Logic
Fault Detection
Register
Status
Register
Watchdog Timer
and
Reset Logic
User Programmable
VTRIP1
User Programmable
VTRIP2
+
-
V2MON
+ VCC
Power on,
Low Voltage
Reset
Generation
-
*X40010/11 = V2MON*
X40014/15 = VCC
WDO
RESET
X40010/14
RESET
X40011/15
V2FAIL
REV 1.3.4 7/12/02
www.xicor.com
Characteristics subject to change without notice. 1 of 25

X40015 Datasheet
X40010/X40011/X40014/X40015 – Preliminary
threshold for either voltage monitor to be repro-
grammed to meet special needs or to fine-tune the
threshold for applications requiring higher precision.
The Watchdog Timer provides an independent protec-
tion mechanism for microcontrollers. When the micro-
controller fails to restart a timer within a selectable time
out interval, the device activates the WDO signal. The
user selects the interval from three preset values. Once
selected, the interval does not change, even after
cycling the power.
The device features a 2-wire interface and software
protocol allowing operation on an I2C® bus.
Dual Voltage Monitors
Device
X40010/11
-A
-B
-C
X40014/15
-A
-B
-C
Expected System Voltages
5V; 3V or 3.3V
5V; 3V
3V; 3.3V; 1.8V
3V; 3.3V; 1.5V
3V; 1.5V
3V or 3.3V; 1.1 or 1.2V
Vtrip1(V)
2.0–4.75*
4.55–4.65*
4.35–4.45*
2.85–2.95*
2.0–4.75*
2.85–2.95*
2.55–2.65*
2.85–2.95*
*Voltage monitor requires VCC to operation. Others are independent of VCC.
Vtrip2(V)
1.70–4.75
2.85–2.95
2.55–2.65
1.65–1.75
0.90–3.50*
1.25–1.35*
1.25–1.35*
0.95–1.05*
POR (system)
RESET = X40010
RESET = X40011
RESET = X40014
RESET = X40015
PIN CONFIGURATION
X40010/14, X40011/15
8-Pin SOIC
V2FAIL 1
V2MON 2
8 VCC
7 WDO
RESET/RESET
VSS
3
4
6 SCL
5 SDA
X40010/14, X40011/15
8-Pin TSSOP
WDO
VCC
V2FAIL
V2MON
1
2
3
4
8 SCL
7 SDA
6 VSS
5 RESET/RESET
PIN DESCRIPTION
Pin
SOIC TSSOP Name
Function
1 3 V2FAIL V2 Voltage Fail Output. This open drain output goes LOW when V2MON is less than VTRIP2 and
goes HIGH when V2MON exceeds VTRIP2. There is no power up reset delay circuitry on this pin.
2 4 V2MON V2 Voltage Monitor Input. When the V2MON input is less than the VTRIP2 voltage, V2FAIL goes
LOW. This input can monitor an unregulated power supply with an external resistor divider or can
monitor a second power supply with no external components. Connect V2MON to VSS or VCC
when not used.The V2MON comparator is supplied by V2MON (X40010/11) or by VCC Input
(X40014/15).
3 5 RESET/ RESET Output. (X40011/15) This is an active LOW, open drain output which goes active when-
RESET ever VCC falls below VTRIP1. It will remain active until VCC rises above VTRIP1 and for the tPURST
thereafter.
RESET Output. (X40010/14) This is an active HIGH CMOS output which goes active whenever
VCC falls below VTRIP1. It will remain active until VCC rises above VTRIP1 and for the tPURST there-
after.
4 6 VSS Ground
REV 1.3.4 7/12/02
www.xicor.com
Characteristics subject to change without notice. 2 of 25


Features Datasheet pdf New Features • Monitor Voltages: 5V to 0.9V • Independent Core Voltage Moni tor Preliminary Datasheet X40010/X400 11/X40014/X40015 Dual Voltage Monitor w ith Integrated CPU Supervisor FEATURES • Dual voltage detection and reset as sertion —Standard reset threshold set tings See Selection table on page 2. Adjust low voltage reset threshold vol tages using special programming sequenc e —Reset signal valid to VCC = 1V — Monitor three voltages or detect power fail • Independent Core Voltage Monit or (V2MON) • Fault detection register • Selectable power on reset timeout (0.05s, 0.2s, 0.4s, 0.8s) • Selectabl e watchdog timer interval (25ms, 200ms, 1.4s, off) • Low power CMOS —25µA typical standby current, watchdog on 6µA typical standby current, watchdo g off • 400kHz 2-wire interface • 2 .7V to 5.5V power supply operation • Available packages —8-lead SOIC, TSSO P APPLICATIONS • Communication Equipm ent —Routers, Hubs, Switches —Disk Arrays, Network Storage • Industrial Systems —Process Control —Intel.
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