X45620 Monitor Datasheet

X45620 Datasheet, PDF, Equivalent


Part Number

X45620

Description

Dual Voltage Monitor

Manufacture

Intersil

Total Page 20 Pages
Datasheet
Download X45620 Datasheet


X45620
®
Data Sheet
July 29, 2005
X45620
FN8250.0
Dual Voltage Monitor with Integrated
System Battery Switch and EEPROM
FEATURES
• Dual voltage monitoring
• Active low reset outputs
• Two standard reset threshold voltages
—Factory programmable threshold
• Lowline Output — zero delayed POR
• Reset signal valid to VCC = 1V
• System battery switch-over circuitry
• Selectable watchdog timer
—(0.15s, 0.4s, 0.8s, off)
• 256Kbits of EEPROM
• Built-in inadvertent write protection
—Power-up/power-down protection circuitry
—Protect 0, 1/4, 1/2 or all of EEPROM array with
programmable Block Lockprotection
—In circuit programmable ROM mode
• Minimize EEPROM programming time
—64 byte page write mode
—Self-timed write cycle
—5ms write cycle time (typical)
• 400kHz 2-wire Interface
BLOCK DIAGRAM
• 2.7V to 5.5V power supply operation
• Available package — 20-lead TSSOP
• Dual supervisor
• Battery switch and output
DESCRIPTION
The Intersil X45620 combines power-on reset control,
battery switch circuit, watchdog timer, supply voltage
supervision, secondary voltage supervision, block lock
protect and serial EEPROM in one package. This
combination lowers system cost, reduces board space
requirements, and increases reliability.
Applying power to the device activates the power-on
reset circuit which holds RESET active for a period of
time. This allows the power supply and oscillator to
stabilize before the processor can execute code.
A system battery switch circuit compares VCC (V1MON)
with VBATT input and connects VOUT to whichever is
higher. This provides voltage to external SRAM or other
circuits in the event of main power failure. The X45620
can drive 50mA from VCC and 250µA from VBATT. The
device switches to VBATT when VCC drops below the
low VCC voltage threshold and VBATT > VCC.
V2MON
WP
SDA
SCL
S0
S1
VCC
(V1MON)
VOUT
VBATT
V2 Monitor
Logic
VOUT
+
VTRIP2
-
Watchdog Transition
Detector
Data
Register
Command
Decode, Test
& Control
Logic
Device
Select
Logic
System
Battery
Switch
VCC Monitor
Logic
Protect Logic
Status
Register
EEPROM
Array
512 X 512
(32K X 8 Bit)
VOUT
+
VTRIP1
-
Watchdog
Timer Reset
Reset &
Watchdog
Timebase
Power-on,
Low Voltage
Reset
Generation
V2FAIL
WDO
BATT-ON
RESET/MR
LOWLINE
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Free Datasheet http://www.datasheet4u.com/

X45620
X45620
DESCRIPTION (Continued)
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’s low VCC detection circuitry protects the
user’s system from low voltage conditions, resetting
the system when VCC (V1MON) falls below the mini-
mum VCC trip point (VTRIP1). RESET is asserted until
VCC returns to proper operating level and stabilizes. A
second voltage monitor circuit tracks the unregulated
supply or monitors a second power supply voltage to
provide a power fail warning. Intersil’s unique circuits
allow the threshold for either voltage monitor to be
reprogrammed to meet special needs or to fine-tune
the threshold for applications requiring higher preci-
sion. (Contact factory for custom VTRIP options)
PIN CONFIGURATION
20-Pin TSSOP
S0
S1
NC
LOWLINE
NC
V2FAIL
V2MON
RESET/MR
WDO
VSS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
VCC (V1MON)
WP
NC
BATT-ON
VOUT
VBATT
SCL
NC
NC
SDA
Ordering Information
VCC Range
4.75–5.5V
VTRIP1 Range
4.5–4.75V
2.7–5.5V
2.55–2.7V
VTRIP2 Range
2.55–2.7V
1.7–1.80V
Package
20L TSSOP
20L TSSOP
Operating
Temperature Range
0°C–70°C
-40°C–85°C
0°C–70°C
-40°C–85°C
Part Number
X45620V20
X45620V20I
X45620V20-2.7
X45620V20I-2.7
PIN DESCRIPTION
Pin Name
Function
1 S0 Device Select Input. This pin has an internal pull down resistor. (>10Mtypical)
2 S1 Device Select Input. This pin has an internal pull down resistor. (>10Mtypical)
3 NC No internal connections
4 LOWLINE Low VCC Detect. This open drain output signal goes LOW when VCC < VTRIP1 and immediately
goes HIGH when VCC > VTRIP1.
5 NC No internal connections
6 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.
7 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.
2 FN8250.0
July 29, 2005
Free Datasheet http://www.datasheet4u.com/


Features ® X45620 Data Sheet July 29, 2005 FN82 50.0 Dual Voltage Monitor with Integra ted System Battery Switch and EEPROM FE ATURES • Dual voltage monitoring • Active low reset outputs • Two standa rd reset threshold voltages —Factory programmable threshold • Lowline Outp ut — zero delayed POR • Reset signa l valid to VCC = 1V • System battery switch-over circuitry • Selectable wa tchdog timer —(0.15s, 0.4s, 0.8s, off ) • 256Kbits of EEPROM • Built-in i nadvertent write protection —Power-up /power-down protection circuitry —Pro tect 0, 1/4, 1/2 or all of EEPROM array with programmable Block Lock™ protec tion —In circuit programmable ROM mod e • Minimize EEPROM programming time —64 byte page write mode —Self-time d write cycle —5ms write cycle time ( typical) • 400kHz 2-wire Interface BL OCK DIAGRAM • • • • 2.7V to 5 .5V power supply operation Available pa ckage — 20-lead TSSOP Dual supervisor Battery switch and output DESCRIPTION The Intersil X45620 combines power-on reset control, battery switch circuit,.
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